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Si Free-Space Amplified Photodetectors


  • Wavelength Ranges from 200 nm to 1100 nm
  • Maximum Bandwidths up to 1.5 GHz
  • Sensitivities Down to Femtowatt Powers
  • Fixed and Switchable Gain Versions

 

 

PDA36A2

Switchable Gain
12 MHz Max Bandwidth

 

Application Idea

PDA Series Detector with Ø1" Lens Tube Attached to a 30 mm Cage System

PDA10A2

Fixed Gain
150 MHz Max Bandwidth

FPD610-FS-VIS

Fixed Gain
600 MHz Max Bandwidth

Related Items


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Item # Wavelength Range  Bandwidth NEP
Fixed Gain
PDA10A2 200 - 1100 nm DC - 150 MHz 29.2 pW/Hz1/2
PDA8A(/M) 320 - 1000 nm DC - 50 MHz 6.5 pW/Hz1/2
PDF10A(/M) 320 - 1100 nm DC - 20 Hz 1.4 x 10 -3 pW/Hz1/2
PDA015A(/M) 400 - 1000 nm DC - 380 MHz 36 pW/Hz1/2
FPD510-FS-VIS 400 - 1000 nm DC - 250 MHz 6.0 pW/Hz1/2
FPD610-FS-VIS 400 - 1000 nm DC - 600 MHz 11.2 pW/Hz1/2
Switchable Gain
PDA100A2a 320 - 1100 nm DC - 11 MHz 2.67 - 71.7 pW/Hz1/2
PDA36A2a 350 - 1100 nm DC - 12 MHz 3.25 - 75.7 pW/Hz1/2
FPD310-FS-VISb 400 - 1000 nm 1 - 1500 MHz 24.0 pW/Hz1/2
  • Switchable with 8 x 10 dB steps. 
  • Switchable with 2 steps, 0 and 20 dB. 

Features

  • Wavelength Ranges within 200 to 1100 nm 
  • Low-Noise Amplification with Fixed or Switchable Gain 
  • Load Impedances 50 Ω and Higher for ≥3 kHz Bandwidth Versions
  • Free-Space Optical Coupling

We offer a selection of Silicon (Si) Free-Space Amplified Photodetectors that are sensitive to light in the UV to the NIR wavelength range. Thorlabs' amplified photodetectors feature a built-in low-noise transimpedance amplifier (TIA) or a low-noise TIA followed by a voltage amplifier. Menlo Systems' FPD series amplified photodetectors have a built-in radio frequency (RF) or transimpedance amplifier. We offer fixed-gain versions that possess a fixed maximum bandwidth and total transimpedance gain, as well as switchable-gain versions with two or eight gain settings.

Thorlabs' photodetectors are designed to meet a range of requirements, with offerings that include the 380 MHz PDA015A with an impulse response of 1 ns, the high-sensitivity PDF10A with a noise equivalent power (NEP) of 1.4 fW/Hz1/2, and the switchable-gain PDA100A2 with eight switchable maximum gain (bandwidth) combinations from 1.51 kV/A (11 MHz) to 4.75 MV/A (3 kHz). The PDF10A with femtowatt sensitivity is a low-frequency device that should only be terminated into high impedance (Hi-Z) loads, while all other of our silicon amplified photodetectors are capable of driving loads from 50 Ω to Hi-Z.

photo detector power supply
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The PDA10A2 with the Included ±12 V Power Supply. Replacement power supplies are sold below.

Every detector has internal SM05 (0.535"-40) threading and external SM1 (1.035"-40) threading. Except for some select detectors, each unit's housing features 8-32 tapped holes (M4 for -EC and /M models). The PDA10A2, PDA36A2, and PDA100A2 feature a new housing with universal taps that accept both 8-32 and M4. For more information about the location of these mounting points and mounting these units, please see the Housing Features and Mounting Options tabs.

Menlo Systems' FPD series detectors are easy-to-use photodiode packages with an integrated high-gain, low-noise RF (FPD310-FS-VIS) or transimpedance (FPD510-FS-VIS and FPD610-FS-VIS) amplifier. The FPD310-FS-VIS is ideal for experiments requiring high bandwidths and extremely short rise times (<1 ns). This detector has a switchable gain with two steps, 0 and 20 dB. The FPD510-FS-VIS and FPD610-FS-VIS have a fixed gain and are optimized for the highest signal-to-noise ratio when detecting low-level optical beat signals at frequencies up to 250 MHz and 600 MHz, respectively. The FPD510-FS-VIS has a rise time of 2 ns, while the FPD610-FS-VIS has a 1 ns rise time. The 3 dB bandwidth of these DC-coupled devices is 200 MHz for the FPD510-FS-VIS and 500 MHz for the FPD610-FS-VIS. The compact design of the FPD detectors allows for easy OEM integration. The housing of each Menlo detector features one M4 tapped hole for post mounting. For more information about the housing, please see the Housing Features tab. For versions of these detectors with FC/PC inputs, see Si Fiber-Coupled Amplified Detectors.


Click to Enlarge

Menlo Systems’ Detectors Include a Location-Specific ±12 V Power Supply

Power Supply
A ±12 V linear power supply is included with each amplified photodetector. A power supply that supports input voltages of 100, 120, and 230 VAC and is compatible with these detectors is also available separately below. Before connecting the power supply to the mains, ensure that the line voltage switch on the power supply module is set to the proper voltage range (either 115 or 230 VAC for all detectors except the PDA10A2, PDA36A2, and PDA100A2). The power supply included with the PDA10A2, PDA36A2, and PDA100A2 features a three-way switch and can be plugged into any 50 to 60 Hz, 100 V / 120 V / 230 V power outlet. The power supplies should always be powered up using the power switch on the power supply itself. Hot plugging the unit is not recommended.

Menlo's FPD510-FS-VIS, FPD610-FS-VIS, and FPD310-FS-VIS include a low-noise power supply. 

Performance Specifications

Item # Wavelength Bandwidth Rise Time Peak Responsivity Noise Equivalent Power
(NEP)a
Active Area Operating
Temperataure
Range
Fixed Gain
PDA10A2b 200 - 1100 nmc DC - 150 MHz 2.3 ns 0.44 A/W @ 730 nm 29.2 pW/Hz1/2 0.8 mm(Ø1 mm) 10 to 50 °C
PDA8Ab 320 - 1000 nm DC - 50 MHz 7 ns 0.56 A/W @ 820 nm 6.5 pW/Hz1/2 0.5 mm(Ø0.8 mm) 10 to 50 °C
PDF10A 320 - 1100 nm DC - 20 Hz 22 ms 0.6 A/W @ 960 nm 1.4x10-3 pW/Hz1/2 1.2 mm(1.1 mm x 1.1 mm) 18 to 28 °C
PDA015Ab 400 - 1000 nm DC - 380 MHz 1.0 ns 0.47 A/W @ 740 nm 36 pW/Hz1/2 0.018 mm(Ø150 µm) 10 to 40 °C
FPD510-FS-VIS 400 - 1000 nm DC - 250 MHz 2 ns - 6.0 pW/Hz1/2 0.13 mm(Ø0.4 mm) 10 to 40 °C
FPD610-FS-VIS 400 - 1000 nm DC - 600 MHz 1 ns - 11.2 pW/Hz1/2 0.13 mm2 (Ø0.4 mm) 10 to 40 °C
Switchable Gain
PDA100A2b 320 - 1100 nm DC - 11 MHzd N/Ae 0.72 A/W @ 960 nm 2.67 - 71.7 pW/Hz1/2 75.4 mm(Ø9.8 mm) 10 to 40 °C
PDA36A2b 350 - 1100 nm DC - 12 MHzd N/Ae 0.65 A/W @ 970 nm 3.25 - 75.7 pW/Hz1/2 13 mm(3.6 mm x 3.6 mm) 10 to 40 °C
FPD310-FS-VIS 400 - 1000 nm 1 - 1500 MHz 0.5 ns - 24.0 pW/Hz1/2 0.13 mm2 (Ø0.4 mm) 10 to 40 °C
  • NEP is specified at the peak responsivity wavelength. As NEP changes with the gain setting for the switchable-gain versions, an NEP range is given for these.
  • This detector has a 50 Ω terminator resistor that is in series with the amplifier output. This forms a voltage divider with any load impedance (e.g. 50 Ω load divides signal in half).
  • When long-term UV light is applied, the product specifications may degrade. For example, the product’s UV response may decrease and the dark current may increase. The degree to which the specifications may degrade is based upon factors such as the irradiation level, intensity, and usage time.
  • This is the maximum possible bandwidth for these amplified photodetectors. Bandwidth varies as a function of gain. For more information see the Switchable Gain table below.
  • Rise times depend on the chosen gain level and wavelength. As one increases the gain of a given optical amplifier, the bandwidth is reduced, and hence, the rise time increases. Please refer to the photodiode tutorial for information on calculating the rise time. Bandwidth specifications for each switchable photodetector may be found in the table below.

Gain Specifications

Fixed Gain

Item # Gain w/ Hi-Z Load Gain w/ 50 Ω Load Offset (±) Output Voltage
w/ Hi-Z Load
Output Voltage
w/ 50 Ω Load
PDA10A2 10 kV/A 5 kV/A 10 mV 0 - 10 V 0 - 5 V
PDA8A 100 kV/A 50 kV/A 10 mV (Max) 0 - 3.6 V 0 - 1.8 V
PDF10Aa 1x109 kV/A - <150 mV 0 - 10 V -
PDA015A 50 kV/A 25 kV/A 20 mV 0 - 10 V 0 - 5 V
FPD510-FS-VIS - 1.5 x 105 V/W - - 0 - 1 V
FPD610-FS-VIS - 2 x 106 V/W - - 0 - 1 V
  • Due to its 25 Hz cutoff frequency, operating the PDF10A(/M) with less than high impedance loading is not recommended.

Switchable Gain

Item # Gain Step
(dB)
Gain
w/ Hi-Z Loada
Gain
w/ 50 Ω Loada
Bandwidth Noise
(RMS)
NEPb Offset (±) Output Voltage
w/ Hi-Z Load
Output Voltage
w/ 50 Ω Load
PDA100A2 0 1.51 kV/A 0.75 kV/A 11 MHz 268 µV 71.7 pW/Hz1/2 5 mV (10 mV Max) 0 - 10 V 0 - 5 V
10 4.75 kV/A 2.38 kV/A 1.4 MHz 195 µV 6.75 pW/Hz1/2 6 mV (10 mV Max)
20 15 kV/A 7.5 kV/A 800 kHz 219 µV 3.36 pW/Hz1/2 6 mV (10 mV Max)
30 47.5 kV/A 23.8 kV/A 260 kHz 222 µV 2.83 pW/Hz1/2 6 mV (10 mV Max)
40 151 kV/A 75 kV/A 90 kHz 229 µV 2.67 pW/Hz1/2 6 mV (10 mV Max)
50 475 kV/A 238 kV/A 28 kHz 271 µV 4.2 pW/Hz1/2 6 mV (10 mV Max)
60 1.5 MV/A 750 kV/A 9 kHz 423 µV 6.24 pW/Hz1/2 6 mV (10 mV Max)
70 4.75 MV/A 2.38 MV/A 3 kHz 1.22 mV 7.88 pW/Hz1/2 8 mV (12 mV Max)
PDA36A2 0 1.51 kV/A 0.75 kV/A 12 MHz 258 µV 75.7 pW/Hz1/2 5 mV (10 mV Max) 0 - 10 V 0 - 5 V
10 4.75 kV/A 2.38 kV/A 1.6 MHz 192 µV 5.8 pW/Hz1/2 6 mV (10 mV Max)
20 15 kV/A 7.5 kV/A 1 MHz 207 µV 3.4 pW/Hz1/2 6 mV (10 mV Max)
30 47.5 kV/A 23.8 kV/A 260 kHz 211 µV 3.4 pW/Hz1/2 6 mV (10 mV Max)
40 150 kV/A 75 kV/A 90 kHz 214 µV 3.25 pW/Hz1/2 6 mV (10 mV Max)
50 475 kV/A 238 kV/A 28 kHz 234 µV 3.69 pW/Hz1/2 6 mV (10 mV Max)
60 1.5 MV/A 750 kV/A 9 kHz 277 µV 4 pW/Hz1/2 6 mV (10 mV Max)
70 4.75 MV/A 2.38 MV/A 3 kHz 388 µV 4.29 pW/Hz1/2 8 mV (12 mV Max)
FPD310-FS-VIS 0 - 2 x 104 Vpp/W 1 - 1500 MHz -c,d 24.0 pW/Hz1/2 N/A (AC Coupling) - 200 - 800 mV
20 - 2 x 103 Vpp/W - 20 - 800 mV
  • Gain figures can also be expressed in units of Ω.
  • The Noise Equivalent Power is specified at the peak wavelength.
  • The Dark State Noise Level is -100 dBm (up to 5 MHz).
  • The Dark State Noise Level is -130 dBm (5 to 1500 MHz).
PDA015 Top Connectors
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Top of the housing on our PDA and PDF detector housings. The Power In connector, Output BNC connector, and power indicator LED are located at the top of the housing. The PDA015A detector is shown.
Removable Internal SM1 Adapter
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The housings of Thorlabs' detectors feature internal SM05 and external SM1 threads. An SM1T1 SM1 Adapter with internal threads is included with each amplified photodetector, and an SM1RR Retaining Ring is included with the PDA015A, PDA10A2, PDA36A2, and PDA100A2.

Housing Features of the Amplified Si Photodetectors

PDA and PDF Detectors
Thorlabs' Amplified Photodiode series feature a slim design and many common elements. Each housing features internal SM05 (0.535"-40) threading and external SM1 (1.035"-40) threading. All detectors include an SM1T1 internally SM1-threaded adapter. Most SM1-threaded fiber adapters are compatible with these detectors. The PDA015A, PDA10A2, PDA36A2, and PDA100A2 also each include an SM1RR retaining ring. A TRE(TRE/M) electrically isolated Ø1/2" post adapter is included with the PDF10A.

Threaded holes on the housings of the detectors allow the units to be mounted in a horizontal or vertical orientation, which gives the user the option to route the power and BNC cables from above or alongside the beam path. The PDA015A has two 8-32 threaded holes, while the metric counterpart has two M4 threaded holes. The PDA8A and PDF10A have three 8-32 threaded holes, while their metric counterparts have three M4 threaded holes. The PDA10A2, PDA36A2, and PDA100A2 have a new housing design that features two universal threaded holes compatible with both 8-32 and M4 threads (please refer to the table below). The PDA10A2 and PDA36A2 also have an active area that is flush with the front of the housing, simplifying alignments within optomechanical systems. As a convenience, the back panels of the PDA10A2, PDA015A, PDA36A2, and PDA100A2 are engraved with the responsivity curve of the Si photodiodes. For more information on mounting these units, please see the Mounting Options tab.

FPD Detectors
The housing of each Menlo Systems' FPD detector features one M4 tapped hole on the bottom for post mounting. The power supply connector and output SMA connector are located on the side of the housing.

Detectors Housing Drawing
(Click Icon for Details)
Mounting Taps SM Thread Compatibility Dimensions Output
Connector
PDA/PDF Fixed Gain
PDA10A2 Two Universal Taps for
8-32 and M4
Internal SM05 (0.535"-40)
External SM1 (1.035"-40)
1.96" x 0.89" x 2.79"
(49.8 mm x 22.5 mm x 70.9 mm)
BNC
PDA015A Two 8-32 Taps
(M4 for Metric Version)
1.89" x 0.83" x 2.76"
(48.0 mm x 21.1 mm x 70.2 mm)
PDA8A, PDF10A Three 8-32 Taps
(M4 for Metric Version)
1.70" x 0.83" x 2.57"
(43.2 mm x 21.1 mm x 65.3 mm)
FPD Fixed Gain
FPD510-FS-VIS,
FPD610-FS-VIS
One M4 Tap N/A 2.36" x 0.79" x 1.97"
(60.0 mm x 20.0 mm x 50.0 mm)
SMA
PDA Switchable Gain 
PDA36A2, PDA100A2 Two Universal Taps for
8-32 and M4
Internal SM05 (0.535"-40)
External SM1 (1.035"-40)
2.07" x 0.89" x 2.79"
(52.5 mm x 22.5 mm x 70.9 mm)
BNC
FPD Switchable Gain
FPD310-FS-VIS One M4 Tap N/A 2.36" x 0.79" x 1.97"
(60.0 mm x 20.0 mm x 50.0 mm)
SMA

PDA and PDF Series Mounting Options

The PDA series of amplified photodetectors are compatible with our entire line of lens tubes, TR series posts, and cage mounting systems. Because of the wide range of mounting options, the best method for mounting the housing in a given optical setup is not always obvious. The pictures and text in this tab will discuss some of the common mounting solutions. As always, our technical support staff is available for individual consultation.

 amplified photodetector  amplified photodetector disassembled  amplified photodetector close up
Picture of a PDA series photodetector as it will look when unpackaged. Picture of a PDA series photodetector with the included SM1T1 and its retaining ring removed from the front of the housing. Thorlabs' DET series photodetectors feature the same mounting options. A close up picture of the front of the PDA36A2 photodetector. The internal SM1 threading on the SM1T1 adapter and internal SM05 threading on the photodetector housing can be seen in this image.

TR Series Post (Ø1/2" Posts) System

The PDA housing can be mounted vertically or horizontally on a TR Series Post using the threaded holes for 8-32 (M4 on metric versions). Select PDA housings feature universally threaded holes for both 8-32 and M4 threads.

 mounted amplified photodetector vertical  mounted amplified photodetector horizontal
PDA series photodetector mounted vertically on a TR series post. In this configuration, the output and power cables (PDA series) are oriented vertically and away from the optic table, facilitating a neater optical setup. PDA series photodetector mounted horizontally on a TR series post. In this configuration, the on/off switch is conveniently oriented on the top of the detector.

Lens Tube System

Each PDA housing includes a detachable Ø1" Optic Mount (SM1T1) that allows for Ø1" (Ø25.4 mm) optical components, such as optical filters and lenses, to be mounted along the axis perpendicular to the center of the photosensitive region. The maximum thickness of an optic that can be mounted in the SM1T1 is 0.1" (2.8 mm). For thicker Ø1" (Ø25.4 mm) optics or for any thickness of Ø0.5" (Ø12.7 mm) optics, remove the SM1T1 from the front of the detector and place (must be purchased separately) an SM1 or SM05 series lens tube, respectively, on the front of the detector.

The SM1 and SM05 threadings on the PDA photodetector housing make it compatible with our SM lens tube system and accessories. Two particularly useful accessories include the SM-threaded irises and the SM-compatible IR and visible alignment tools. Also available are fiber optic adapters for use with connectorized fibers.

 Lens tube mounted amplified photodetector
PDA series photodetector mounted onto a Ø1" Slotted Lens Tube, which is housing a focusing optic. The lens tube is attached to a 30 mm cage system via a CP02 SM1-Threaded 30 mm Cage Plate. This arrangement allows easy access for optic adjustment and signal alignment.

Cage System

The simplest method for attaching the PDA photodetector housing to a cage plate is to remove the SM1T1 that is attached to the front of the PDA and use the external SM1 threads. A cage plate, such as the CP02 30 mm cage plate, can be directly attached to the SM1 threads. Then the retaining ring, included with the SM1T1, can be threaded using a spanner wrench into the CP02 to ensure the cage plate is tightened to the desired location and square with the photodetector housing. 

This method for attaching the PDA photodetector housing to a cage plate does not allow much freedom in determining the orientation of the photodetector; however, it has the benefit of not needing an adapter piece, and it allows the diode to be as close as possible to the cage plate, which can be important in setups where the light is divergent. As a side note, Thorlabs sells the SM05PD and SM1PD series of photodiodes that can be threaded into a cage plate so that the diode is flush with the front surface of the cage plate; however, the photodiode is unbiased.

For more freedom in choosing the orientation of the PDA photodetector housing when attaching it, an SM1T2 lens tube coupler can be purchased. In this configuration the SM1T1 is left on the detector and the SM1T2 is threaded into it. The exposed external SM1 threading is now deep enough to secure the detector to a CP02 cage plate in any orientation and lock it into place using one of the two locking rings on the ST1T2.

 photodetector with cage plate

photodetector with cage plate

photodetector with cage plate and spacer

This picture shows a PDA series photodetector attached to a CP02 cage plate after removing the SM1T1. The retaining ring from the SM1T1 was used to make the orientation of the detector square with the cage plate. These two pictures show a PDA series photodetector in a horizontal configuration. The top picture shows the detector directely coupled to a CP02 cage plate.
The bottom picture shows a PDA series photodetector attached to a CP02 cage plate using an SM1T2 adapter in addition to the SM1T1 that comes with the PDA series detector.

Although not pictured here, the PDA photodetector housing can be connected to a 16 mm cage system by purchasing an SM05T2. It can be used to connect the PDA photodetector housing to an SP02 cage plate.

Application

The image below shows a Michelson Interferometer built entirely from parts available from Thorlabs. This application demonstrates the ease with which an optical system can be constructed using our lens tube, TR series post, and cage systems. 

 Michelson interferometer

The table below contains a part list for the Michelson Interferometer for use in the visible range. Follow the links to the pages for more information about the individual parts. 

Item # Quantity Description Item # Quantity Description
KC1 1 Mirror Mount CT1 1 1/2" Travel Translator
BB1-E02 2 Broadband Dielectric Laser Mirrors SM1D12 1 SM1 Threaded Lens Tube Iris
ER4 8 4" Cage Rods SM1L30C 1 SM1 3" Slotted Lens Tube
ER6 4 6" Cage Rods SM1V05 1 Ø1" Adjustable Length Lens Tube
CCM1-BS013 1 Cube-Mounted Beamsplitter CP08FP 1 30 mm Cage Plate for FiberPorts
BA2 1 Post Base (not shown in picture) PAF2-5A 1 FiberPort
TR2 1 Ø1/2" Post, 2" in Length P1-460B-FC-2 1 Single Mode Fiber Patch Cable
PH2 1 Ø1/2" Post Holder DET36A / PDA36A2 1 Biased / Amplified Photodiode Detector

PDA and PDF Series Detectors

BNC Female Output (Photodetector)

BNC Female

PDA10A2, PDF10A, PDA015A, PDA100A2, PDA36A2: 0 - 10 V Output
PDA8A: 0 - 3.6 V Output

Male (Power Cables)

Pinout for PDA Power Cable

Female Power IN (Photodetector)

Pinout for PDA Power Connector


FPD Series Detectors

Signal Out- SMA Female (Photodetector)

BNC Female

For connection to a suitable monitoring device, e.g. oscilloscope or RF-spectrum-analyzer, with 50 Ω impedance.

Female (Power Cables)

Pinout for FPD Power Cable

Male Power IN (Photodetector)

Pinout for FPDPower Connector

Photodiode Tutorial

Theory of Operation

A junction photodiode is an intrinsic device that behaves similarly to an ordinary signal diode, but it generates a photocurrent when light is absorbed in the depleted region of the junction semiconductor. A photodiode is a fast, highly linear device that exhibits high quantum efficiency based upon the application and may be used in a variety of different applications.

It is necessary to be able to correctly determine the level of the output current to expect and the responsivity based upon the incident light. Depicted in Figure 1 is a junction photodiode model with basic discrete components to help visualize the main characteristics and gain a better understanding of the operation of Thorlabs' photodiodes.

Equation 1
Photodiode Circuit Diagram
Figure 1: Photodiode Model

Photodiode Terminology

Responsivity
The responsivity of a photodiode can be defined as a ratio of generated photocurrent (IPD) to the incident light power (P) at a given wavelength:

Equation 2

Modes of Operation (Photoconductive vs. Photovoltaic)
A photodiode can be operated in one of two modes: photoconductive (reverse bias) or photovoltaic (zero-bias). Mode selection depends upon the application's speed requirements and the amount of tolerable dark current (leakage current).

Photoconductive
In photoconductive mode, an external reverse bias is applied, which is the basis for our DET series detectors. The current measured through the circuit indicates illumination of the device; the measured output current is linearly proportional to the input optical power. Applying a reverse bias increases the width of the depletion junction producing an increased responsivity with a decrease in junction capacitance and produces a very linear response. Operating under these conditions does tend to produce a larger dark current, but this can be limited based upon the photodiode material. (Note: Our DET detectors are reverse biased and cannot be operated under a forward bias.)

Photovoltaic
In photovoltaic mode the photodiode is zero biased. The flow of current out of the device is restricted and a voltage builds up. This mode of operation exploits the photovoltaic effect, which is the basis for solar cells. The amount of dark current is kept at a minimum when operating in photovoltaic mode.

Dark Current
Dark current is leakage current that flows when a bias voltage is applied to a photodiode. When operating in a photoconductive mode, there tends to be a higher dark current that varies directly with temperature. Dark current approximately doubles for every 10 °C increase in temperature, and shunt resistance tends to double for every 6 °C rise. Of course, applying a higher bias will decrease the junction capacitance but will increase the amount of dark current present.

The dark current present is also affected by the photodiode material and the size of the active area. Silicon devices generally produce low dark current compared to germanium devices which have high dark currents. The table below lists several photodiode materials and their relative dark currents, speeds, sensitivity, and costs.

MaterialDark CurrentSpeedSpectral RangeCost
Silicon (Si) Low High Speed Visible to NIR Low
Germanium (Ge) High Low Speed NIR Low
Gallium Phosphide (GaP) Low High Speed UV to Visible Moderate
Indium Gallium Arsenide (InGaAs) Low High Speed NIR Moderate
Indium Arsenide Antimonide (InAsSb) High Low Speed NIR to MIR High
Extended Range Indium Gallium Arsenide (InGaAs) High High Speed NIR High
Mercury Cadmium Telluride (MCT, HgCdTe) High Low Speed NIR to MIR High

Junction Capacitance
Junction capacitance (Cj) is an important property of a photodiode as this can have a profound impact on the photodiode's bandwidth and response. It should be noted that larger diode areas encompass a greater junction volume with increased charge capacity. In a reverse bias application, the depletion width of the junction is increased, thus effectively reducing the junction capacitance and increasing the response speed.

Bandwidth and Response
A load resistor will react with the photodetector junction capacitance to limit the bandwidth. For best frequency response, a 50 Ω terminator should be used in conjunction with a 50 Ω coaxial cable. The bandwidth (fBW) and the rise time response (tr) can be approximated using the junction capacitance (Cj) and the load resistance (RLOAD):

Equation 3

Noise Equivalent Power
The noise equivalent power (NEP) is the generated RMS signal voltage generated when the signal to noise ratio is equal to one. This is useful, as the NEP determines the ability of the detector to detect low level light. In general, the NEP increases with the active area of the detector and is given by the following equation:

Photoconductor NEP

Here, S/N is the Signal to Noise Ratio, Δf is the Noise Bandwidth, and Incident Energy has units of W/cm2. For more information on NEP, please see Thorlabs' Noise Equivalent Power White Paper.

Terminating Resistance
A load resistance is used to convert the generated photocurrent into a voltage (VOUT) for viewing on an oscilloscope:

Equation 4

Depending on the type of the photodiode, load resistance can affect the response speed. For maximum bandwidth, we recommend using a 50 Ω coaxial cable with a 50 Ω terminating resistor at the opposite end of the cable. This will minimize ringing by matching the cable with its characteristic impedance. If bandwidth is not important, you may increase the amount of voltage for a given light level by increasing RLOAD. In an unmatched termination, the length of the coaxial cable can have a profound impact on the response, so it is recommended to keep the cable as short as possible.

Shunt Resistance
Shunt resistance represents the resistance of the zero-biased photodiode junction. An ideal photodiode will have an infinite shunt resistance, but actual values may range from the order of ten Ω to thousands of MΩ and is dependent on the photodiode material. For example, and InGaAs detector has a shunt resistance on the order of 10 MΩ while a Ge detector is in the kΩ range. This can significantly impact the noise current on the photodiode. For most applications, however, the high resistance produces little effect and can be ignored.

Series Resistance
Series resistance is the resistance of the semiconductor material, and this low resistance can generally be ignored. The series resistance arises from the contacts and the wire bonds of the photodiode and is used to mainly determine the linearity of the photodiode under zero bias conditions.

Common Operating Circuits

Reverse Biased DET Circuit
Figure 2: Reverse-Biased Circuit (DET Series Detectors)

The DET series detectors are modeled with the circuit depicted above. The detector is reverse biased to produce a linear response to the applied input light. The amount of photocurrent generated is based upon the incident light and wavelength and can be viewed on an oscilloscope by attaching a load resistance on the output. The function of the RC filter is to filter any high-frequency noise from the input supply that may contribute to a noisy output.

Reverse Biased DET Circuit
Figure 3: Amplified Detector Circuit

One can also use a photodetector with an amplifier for the purpose of achieving high gain. The user can choose whether to operate in Photovoltaic of Photoconductive modes. There are a few benefits of choosing this active circuit:

  • Photovoltaic mode: The circuit is held at zero volts across the photodiode, since point A is held at the same potential as point B by the operational amplifier. This eliminates the possibility of dark current.
  • Photoconductive mode: The photodiode is reversed biased, thus improving the bandwidth while lowering the junction capacitance. The gain of the detector is dependent on the feedback element (Rf). The bandwidth of the detector can be calculated using the following:

Equation 5

where GBP is the amplifier gain bandwidth product and CD is the sum of the junction capacitance and amplifier capacitance.

Effects of Chopping Frequency

The photoconductor signal will remain constant up to the time constant response limit. Many detectors, including PbS, PbSe, HgCdTe (MCT), and InAsSb, have a typical 1/f noise spectrum (i.e., the noise decreases as chopping frequency increases), which has a profound impact on the time constant at lower frequencies.

The detector will exhibit lower responsivity at lower chopping frequencies. Frequency response and detectivity are maximized for

Photoconductor Chopper Equation


Posted Comments:
john.w.easton  (posted 2018-12-04 11:51:56.953)
I am a little confused by the "Hi-Z" references for higher (0-10 V) output on the PDA10A2. Just how high-Z is "hi-z"? I understand the 50-ohm resistor gives a 0-5V output, but what resistance is needed for 0-10V? Does the device internally compensate for higher impedences, or is there something in a voltage divider I'm missing?
YLohia  (posted 2018-12-05 04:18:17.0)
Hello, there is no discrete point of transition between 5V max output and 10V max output. This is entirely dependent on the scale factor due to the voltage divider mentioned in the manual. For example, if the load impedance used is 150 Ohms, the scale factor then becomes 150/(150 + 50) = 0.75, which means that the voltage output range will be 0 to 7.5V. The device does not internally compensate for impedance levels.
yongqi.shi  (posted 2018-11-27 18:16:43.07)
Dear sir, I'm using a PDA36A2 photodetector to measure a beam with power around 0.4mW. When I set to 0dB gain, the output voltage is exactly P*R(780nm)*Gain=140mV. Considering there is stub-style 50 ohm terminator connected, why I didn't see any voltage distribution (this scaling factor from manual) of output?
benjamin.franz  (posted 2018-05-07 15:37:59.407)
Dear Thorlabs-Team, We have issues opening the PDA10A2 .step file. It looks very buggy with intersecting planes and volumes. Do you have alternatives or a fixed model for us? (Also, Parasolid does not work for us) Best regards, Ben
YLohia  (posted 2018-05-09 08:03:49.0)
Hi Ben, thank you for contacting Thorlabs. The .step and .sldprt files work for us using Solidworks Premium 2016 and eDrawings. I will reach out to you directly with a .igs file.
florio  (posted 2018-01-05 14:06:15.767)
Dear Thorlabs team, in some of my applications, I calculated that the detector PDA100A will be exposed to a light power (at different wavelengths) up to 300 mW. Is there a filter I can buy to make valuable measurements in this range, without damaging the detector? Thank you in advance. Best regards, Kevin
nbayconich  (posted 2018-02-21 09:58:12.0)
Thank you for contacting Thorlabs. The transimpedance amplifiers of these detectors will saturate before being damaged and at the lowest gain setting when using a 50 ohm terminating resistor the amplifier of the PDA100-EC will saturate at around 21.3mW. Since you have a 300mW source I suggest using a neutral density filter that has an optical density of at least OD 1.2 or higher, something like NE513B-A can be suitable. I'll reach out to you directly to discuss the damage thresholds of our ND filters.
soshenko.v  (posted 2017-10-02 16:47:53.717)
Hello thorlabs. I want to supply PDA100A from two Pb batteries. Could you provide me with partnumber of cable plug to fit PDA power input?
tfrisch  (posted 2017-11-14 03:04:30.0)
Hello, thank you for contacting Thorlabs. If you want to wire your own power supply, you can use PDA-C-72 which is lower down on this page.
zif3ng.wu  (posted 2017-07-04 11:54:04.23)
Hello, I am interested in buying either the PDA015A or PDA10A. My application is for optical wireless communications, thus I would like to have the flexibility of mounting different focusing lenses onto the front of the detector. Which products can you recommend for this purpose?
tfrisch  (posted 2017-08-04 10:16:18.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly to discuss your application, but likely a plano-convex lens just to collect light and focus it onto the detector would improve signal strength.
tanmaybhwmk3  (posted 2017-06-09 22:54:49.703)
In the safety guide, it is mentioned about the scale factor. And, after calculating maximum incident light intensity from that formula we got 22 mW for PDA100A-EC. But, without scale-factor it is coming 10.7 mW. Kindly give your valuable reply regarding which answer is correct.
tfrisch  (posted 2017-06-26 10:11:56.0)
Hello, thank you for contacting Thorlabs. There is not a maximum incident power spec for several reasons. One is that the responsivity is dependent on wavelength, so the power would change. Another is that saturation of the detector occurs before damage. I will reach out to you with more details on estimating these values given the Max Output Current (100mA) and the other details of your setup.
christian.schuster  (posted 2017-06-09 14:06:41.517)
Does the PDF10A has any coatings on the sensor area, such as an anti-reflective layer ?
wskopalik  (posted 2017-06-13 05:18:30.0)
This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry. The photodiode in the PDF10A has a protective window made of borosilicate glass, but no anti-reflective coating. I will contact you directly to provide further assistance.
mebert  (posted 2017-05-17 22:22:25.577)
Hi, can the voltage regulators on the PDA36A work with +/-15 V? We have a +/-15 V distribution system and I would like to get rid of the bulky AC/DC converters provided with the units we have.
nbayconich  (posted 2017-05-22 04:29:42.0)
Thank you for contacting Thorlabs. The input voltage of the PDA36A must be kept at ±12V. Driving at 15V can damage the output drive when operating 50 ohm load. A Techsupport representative will contact you directly.
jona.beysens  (posted 2017-01-18 09:19:54.95)
Hi, We have a PDA10A in our laboratory in Belgium and we measure strange values. In the data sheet, it is mentioned that the output voltage of the photodiode is in the range 0V->10V. However, if we connect the output of the PDA10 directly to an oscilloscope, we measure values of -180mV when there is almost no light. Can you help us out with this problem? Best regards, Jona Beysens
tfrisch  (posted 2017-01-19 02:51:04.0)
Hello Jona, thank you for contacting Thorlabs. I will reach out to you directly to troubleshoot your PDA10A.
brian.markey  (posted 2016-12-01 11:09:02.007)
Your tutorial indicates that these Si photodetectors are highly linear. Can you quantify the linearity and dynamic range? i.e. how linear and over what range?
swick  (posted 2016-12-07 03:05:17.0)
This is a response from Sebastian at Thorlabs. Thank you very much for your inquiry. The maximum output voltage swing of PDF10A is +10V. Saturation of the output will occur at optical input power greater than CW Saturation Power (16pW for PDF10A). Saturation of the Photodiode will cause nonlinear behavior. ND filters can be used to reduce the optical power and extend the operation range. The minimal detectable power, calculated from NEP at 960nm and SNR=1 , is 6fW. I have contacted you directly to provide further assistance.
Ludovic.BERNARD  (posted 2016-07-18 09:31:07.223)
Hello, I'm using the PDA36A-EC to detect light pulses from 1 to 10 µs. I observe a charging time of 1.8 µs for the photodetector response signal and I was wondering if it was a normal value. If not can it come from the photodetector? Thank you.
jlow  (posted 2016-07-18 10:52:36.0)
Response from Jeremy at Thorlabs: The rise time is going to be dependent on the gain setting that you choose. Also, if the detector is saturated, the rise time will be longer than usual as well. We will contact you directly to troubleshoot this.
kangsongbai83  (posted 2016-06-13 20:05:32.29)
Hello,I have a PDA36A Si detector which does not work now. I wonder how to repair it? Should I just send it back to Thorlabs? I think it is under warranty but not very sure.
besembeson  (posted 2016-06-15 10:52:17.0)
Response from Bweh at Thorlabs USA: I have contacted you directly.
goncharovv  (posted 2016-03-25 15:53:47.357)
What is the maximum amount of optical power that the PDA36A and PDA100A can withstand before the damage occurs (not saturation).
besembeson  (posted 2016-03-25 05:01:36.0)
Response from Bweh at Thorlabs USA: You should keep the power below 100mW to prevent damage. For typical use, under 1mW is recommended to keep the detector in the linear regime as these are amplified detectors.
liuhong_ayj  (posted 2015-03-31 16:39:31.477)
I want to use PDA10A for detection of rapid fluorescence signals (60MHz)from organic dyes in cell membranes. this PDA10A can go to work?
jlow  (posted 2015-03-31 01:17:33.0)
Response from Jeremy at Thorlabs: We will have to get more information about your application before being able to recommend a specific detector. I will contact you directly about this.
alaaeldin12  (posted 2014-10-16 15:17:43.007)
Hello, I want to ask about the output of the PDA10A detector. What is the compatible power meter? Please contact me via email. Thank you.
jlow  (posted 2014-10-16 02:35:46.0)
Response from Jeremy at Thorlabs: The PDA10A outputs a voltage signal but the detector's response is not NIST calibrated. We do offer power meter system which can be found at http://www.thorlabs.com/navigation.cfm?guide_id=37. I will contact you directly about our power meter system.
adavies78  (posted 2014-10-08 09:36:17.2)
Is there any certification that the responsivity is linear across intensity range? i.e. is dV/dP the same for output in the 0-1V range as the 9-10?
jlow  (posted 2014-10-08 04:04:38.0)
Response from Jeremy at Thorlabs: The response of the detector is linear for output below the maximum voltage (10V with Hi-Z load).
lesundak  (posted 2014-08-22 18:28:19.383)
hello, I cannot obtain more than 0,45V output from my PDA8A. Under this value detector works good, but at 0,45V looks like it is saturated. What can be wrong? Thanks
shallwig  (posted 2014-08-26 07:38:27.0)
This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. I am sorry that you face problems with the PDA8A. I will contact you directly to troubleshoot this problem.
vkogotkov  (posted 2014-07-18 12:44:03.447)
Dear Sirs, We would want to use one of your Amplified Photodetectors for detecting radiation of N2-laser. Beam characteristics: LengthxWidth-20x10mm, Pulse intensity-0,5 mJ, pulse duration-100ns. What Amp. Photodetector is best for our application? As I understand we'd need additional focusing and filtering components for this system... What can You advise?
jlow  (posted 2014-08-01 01:49:35.0)
Response from Jeremy at Thorlabs: There are a few details missing from your setup description. We will contact you directly to discuss about this.
hha07  (posted 2014-03-28 17:31:22.757)
The datasheet for the PDA8A/M specifies the output voltage for terminations of Hi-Z and 50 Ohm. I have an application where I'd like to connect the detector to a Mini-circuits mixer (tuf-3lh) which has an input impedance given by a coil connected to ground such that at DC the impedance is 0 Ohm. This will of course force the signal to 0 at DC. Will this damage the PDA8A/M detector by drawing to much current. What is the output impedance of the PDA8A/M and how is it connected, in series or in parallel? Regards, Hans Harhoff Andersen.
jvigroux  (posted 2014-04-14 05:01:57.0)
A response from Julien at Thorlabs: Thank you for your inquiry! The connection to the coil will not damage the detector. This being said, one could of course use a coupling capacitance before the balun to achieve separation from the DC path. The output impedance is 47Ohms series.
paul.hamilton  (posted 2013-09-06 17:49:33.61)
I'm having a hard time reproducing the numbers in the manual of the PDA36A for the NEP. I would have assumed that NEP = Noise_rms / Sqrt(BW) / Gain / Responsivity, but when I put in these numbers I get a NEP more than an order magnitude higher. Am I doing something incorrectly?
jlow  (posted 2013-09-11 14:38:00.0)
Response from Jeremy at Thorlabs: You are correct that NEP = Vrms/(Gain*Responsivity*vbandwidth). The bandwidth used in the calculation is the bandwidth of the measuring system and not the bandwidth of the detector.
yuby2010  (posted 2013-08-28 14:19:19.92)
There is a response curve in the Manual of PDA10A,but I can't find the detail spectrum response data, the responsivity of each wavelength. Would you please give me this?
sharrell  (posted 2013-08-29 16:35:00.0)
Response from Sean at Thorlabs: Thank you for your feedback. I emailed you the data file directly, and we are in the process of adding the data for all of our Amplified Detectors directly to the website.
leon.islas  (posted 2013-05-09 13:33:28.323)
I am planing on using this PDA for detection of rapid (msec) fluorescence signals from organic dyes in cell membranes but I am not sure that about the sensitivity. Do you have any experience with this type of measurement (voltage clamp fluorometry) or can recommend references?
jlow  (posted 2013-05-09 15:00:00.0)
Response from Jeremy at Thorlabs: I will get in contact with you directly do discuss about the details in your experiments.
lixx1878  (posted 2013-04-05 12:09:53.973)
I have a question about PDA36A. I plan to do photoluminescence experiment with it under low temperature (>77K). Does PDA36A work at that range? Do you have a responsitivity curve for that?
jlow  (posted 2013-04-08 09:52:00.0)
Response from Jeremy at Thorlabs: The operating temperature for the PDA36A is 0-40°C.
adamaller  (posted 2013-03-27 05:19:04.92)
Why the maximum incident light intensity is not indicated clearly, please?
cdaly  (posted 2013-04-02 16:04:00.0)
Response from Chris at Thorlabs: Thank you for using our web feedback. The saturation point can be found by dividing the max voltage output for it's corresponding gain and responsivity. So for example with a 50Ohm resistance, the PDA8A can ouput up to 5V, dividing by 50kV/A and 0.5A/W (at peak responsivity), we end up with 64.3mW on the lowest gain setting. The same can be done for the other detectors as well. Each on the lowest settings, the PDA10A would be 2.22mW. The PDFF10A would be 2nW, the PDA36A and PDA100A would both be 10.3mW.
adavies78  (posted 2013-03-15 09:07:24.04)
I have a DC sensing application where i use 4 PDA36A detectors at the highest gain setting. When I turn off the light source, there is a wide range of dark level--understandable for different chips. But some are negative. I don't understand why there would be negative dark signal unless an offset is built into the output...can you explain?
jlow  (posted 2013-03-18 14:35:00.0)
Response from Jeremy at Thorlabs: The negative value that you see is the amplifier offset, which can be negative (for PDA36A, the offset should be within ±10mV at 70dB gain). For the recently purchased PDA36A (after July 2012), and PDA100A (after October 2012), there is a way to adjust the amplifier offset. If you remove the back cover of the PDA, there is a trimmer potentiometer which sets the offset. You can set the offset to what your desire value by covering up, and then adjusting the offset at 70dB gain setting.
sharrell  (posted 2012-12-06 15:58:00.0)
Response from Sean at Thorlabs: Thank you for your feedback. For the PDA36A(-EC), the bandwidth at the 70 dB gain setting is 5 kHz. Complete specifications at each gain setting can be found on page 9 of the manual (http://www.thorlabs.com/Thorcat/13000/PDA36A-Manual.pdf). I have already updated the webpage to refer future customers to that location. We are in the process of developing a new website feature that will allow us to provide the complete set of specifications for detectors and other products in a more convinient way, and I will make sure that this page is one of the first to utilize the new feature.
graham.naylor  (posted 2012-12-06 15:17:45.83)
What is the bandwidth at full gain - it is not clear from the web site and I have an inkling that you reduce the bandwidth at higher gain. thanks Graham
jjurado  (posted 2011-06-28 17:09:00.0)
Response from Javier at Thorlabs to Veinardi.Suendo: Thank you very much for contacting us. Although it would be recommendable to place the FEL1200 filter at the input of the collimator, the structure of the setup you propose might work without the lens. The only concern is, of course, the space between the tip of the fiber and the lens. In principle, you could use the following path: Collimator-> Fiber-> SM1SMA Fiber Adapter-> Filter-> Detector. However, since the overall thickness of the filter is 6.3 mm, this added distance between the fiber and the active area of the detector, which is 1.1 mm x 1.1 mm, could cause some loss, since the output from the fiber will be divergent. You could perhaps use an aspheric lens pair to focus the output from the fiber onto the detector (link below), but this would add to the overall length and complexity of the setup. I will contact you directly to discuss this and other possibilities for your application. Aspheric lens pairs: http://thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=278 SM1SMA adapter: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=69&pn=SM1SMA#3182
Veinardi.Suendo  (posted 2011-06-28 15:59:21.0)
Dear Sirs, We planned to purchase your product (PDF10C/M) for our lab. in Indonesia. I believed that they have already launched the project. However, we need your assistance to connect this detector to optical fiber with SMA termination and a long wave pass filter (FEL1200). Would you mind telling us, which part is needed. Personally, I have in my mind this kind of setup: (collimator)--> (Optical Fiber)--> (fiber adapter)--> (SM1 tube)--> (lens?)--> (filter)--> (detector). Is it possible? Do we really need a lens in this case? Thank you very much for your assistance. Yours Sincerely, Dr. Veinardi Suendo Customer Email: Veinardi.Suendo@polytechnique.edu This customer would like to be contacted.
jjurado  (posted 2011-04-20 09:11:00.0)
Response from Javier at Thorlabs to last poster: Thank you very much for your feedback. We have updated the Overview tab in order to clarify the different transimpedance specs for these detectors. Please do not hesitate to contact us at techsupport@thorlabs.com if you have any further questions or comments.
user  (posted 2011-04-19 17:21:14.0)
Transimpedance gain for the PDF10A is mentioned in the Overview tab, but the wording seems to indicate that both this and the PDF10C share a common gain value.

The following table lists Thorlabs' selection of photodiodes and photoconductive detectors. Item numbers in the same row contain the same detector element.

Photodetector Cross Reference
Wavelength Material Unmounted
Photodiode
Unmounted
Photoconductor
Mounted
Photodiode
Biased
Detector
Amplified
Detector
150 - 550 nm GaP FGAP71 - SM05PD7A DET25K2 PDA25K2
200 - 1100 nm Si FDS010 - SM05PD2A
SM05PD2B
DET10A2 PDA10A2
Si - - SM1PD2A - -
320 - 1000 nm Si - - - - PDA8A(/M)
320 - 1100 nm Si FD11A - SM05PD3A - PDF10A(/M)
Si - - - DET100A2 PDA100A2
340 - 1100 nm Si FDS10X10 - - - -
350 - 1100 nm Si FDS100
FDS100-CAL a
- SM05PD1A
SM05PD1B
DET36A2 PDA36A2
Si FDS1010
FDS1010-CAL a
- SM1PD1A
SM1PD1B
- -
400 - 1000 nm Si - - - - PDA015A(/M)
FPD310-FS-VIS
FPD310-FC-VIS
FPD510-FC-VIS
FPD510-FS-VIS
FPD610-FC-VIS
FPD610-FS-VIS
400 - 1100 nm Si FDS015 b - - - -
Si FDS025 b
FDS02 c
- - DET02AFC(/M)
DET025AFC(/M)
DET025A(/M)
DET025AL(/M)
-
400 - 1700 nm Si & InGaAs DSD2 - - - -
500 - 1700 nm InGaAs - - - DET10N2 -
750 - 1650 nm InGaAs - - - - PDA8GS
800 - 1700 nm InGaAs FGA015 - - - PDA015C(/M)
InGaAs FGA21
FGA21-CAL a
- SM05PD5A DET20C2 PDA20C(/M)
PDA20CS2
InGaAs FGA01 b
FGA01FC c
- - DET01CFC(/M) -
InGaAs FDGA05 b - - - PDA05CF2
InGaAs - - - DET08CFC(/M)
DET08C(/M)
DET08CL(/M)
PDF10C(/M)
800 - 1800 nm Ge FDG03
FDG03-CAL a
- SM05PD6A DET30B2 PDA30B2
Ge FDG50 - - DET50B2 PDA50B2
Ge FDG05 - - - -
900 - 1700 nm InGaAs FGA10 - SM05PD4A DET10C2 PDA10CS2
900 - 2600 nm InGaAs FD05D - - DET05D2 -
FD10D - - DET10D2 PDA10D2
950 - 1650 nm InGaAs - - - - FPD310-FC-NIR
FPD310-FS-NIR
FPD510-FC-NIR
FPD510-FS-NIR
FPD610-FC-NIR
FPD610-FS-NIR
1.0 - 2.9 µm PbS - FDPS3X3 - - PDA30G(-EC)
1.0 - 5.8 µm InAsSb - - - - PDA10PT(-EC)
1.5 - 4.8 µm PbSe - FDPSE2X2 - - PDA20H(-EC)
2.0 - 5.4 µm HgCdTe (MCT) - - - - PDA10JT(-EC)
2.0 - 8.0 µm HgCdTe (MCT) VML8T0
VML8T4 d
- - - PDAVJ8
2.0 - 10.6 µm HgCdTe (MCT) VML10T0
VML10T4 d
- - - PDAVJ10
2.7 - 5.0 µm HgCdTe (MCT) VL5T0 - - - PDAVJ5
2.7 - 5.3 µm InAsSb - - - - PDA07P2
  • Calibrated Unmounted Photodiode
  • Unmounted TO-46 Can Photodiode
  • Unmounted TO-46 Can Photodiode with FC/PC Bulkhead
  • Photovoltaic Detector with Thermoelectric Cooler

Si Amplified Photodetectors, Fixed Gain

Item #a Housing Featuresb Wavelength Range Bandwidth Range Rise Time Gain NEP Typical Performance Graphs Active Areac Operating Temperature Range Power Supply Included
Hi-Z Load 50 Ω Load
PDA10A2 200 - 1100 nmd DC - 150 MHz 2.3 ns 10 kV/A 5 kV/A 29.2 pW/Hz1/2 info 0.8 mm2
(Ø1 mm)
e
10 to 50 °C Yes
PDA8A 320 - 1000 nm DC - 50 MHz 7 ns 100 kV/A 50 kV/A 6.5 pW/Hz1/2 info 0.5 mm2
(Ø0.8 mm)
10 to 50 °C Yes
PDF10A 320 - 1100 nm DC - 20 Hz 22 ms 1 x 109 kV/A - 1.4 x 10-3 pW/Hz1/2 info 1.2 mm2
(1.1 x 1.1 mm)
18 to 28 °C Yes
PDA015A 400 - 1000 nm DC - 380 MHz 1.0 ns 50 kV/A 25 kV/A 36 pW/Hz1/2 info 0.018 mm2
(Ø150 µm)
10 to 40 °C Yes
FPD510-FS-VIS 400 - 1000 nm DC - 250 MHz 2 ns - 1.5 x 105 V/W 6.0 pW/Hz1/2 info 0.13 mm2
(Ø0.4 mm)
10 to 40 °C Yes
FPD610-FS-VIS 400 - 1000 nm DC - 600 MHz 1 ns - 2 x 106 V/W 11.2 pW/Hz1/2 info 0.13 mm2
(Ø0.4 mm)
10 to 40 °C Yes
  • Click on the links to view photos of the items.
  • Click the icons for details of the housing.
  • Click on the links to view photos of the detector elements.
  • When long-term UV light is applied, the product specifications may degrade. For example, the product’s UV response may decrease and the dark current may increase. The degree to which the specifications may degrade is based upon factors such as the irradiation level, intensity, and usage time.
  • The detector active area surface is flush with the front the housing.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PDA8A Support Documentation
PDA8ASi Fixed Gain Detector, 320 - 1000 nm, 50 MHz BW, 0.5 mm2, 8-32 Taps
$416.16
Today
PDF10A Support Documentation
PDF10ASi fW Sensitivity Fixed Gain Detector, 320 - 1100 nm, 20 Hz BW, 1.2 mm2, 8-32 Taps
$820.08
Today
PDA015A Support Documentation
PDA015ASi Fixed Gain Detector, 400 - 1000 nm, 380 MHz BW, 0.018 mm2, 8-32 Taps
$895.00
Today
+1 Qty Docs Part Number - Universal Price Available
PDA10A2 Support Documentation
PDA10A2Si Fixed Gain Detector, 200 - 1100 nm, 150 MHz BW, 0.8 mm2, Universal 8-32 / M4 Taps
$309.06
Today
+1 Qty Docs Part Number - Metric Price Available
PDA8A/M Support Documentation
PDA8A/MSi Fixed Gain Detector, 320 - 1000 nm, 50 MHz BW, 0.50 mm2, M4 Taps
$416.16
Today
PDF10A/M Support Documentation
PDF10A/MSi fW Sensitivity Fixed Gain Detector, 320 - 1100 nm, 20 Hz BW, 1.2 mm2, M4 Taps
$820.08
Today
PDA015A/M Support Documentation
PDA015A/MSi Fixed Gain Detector, 400 - 1000 nm, 380 MHz BW, 0.018 mm2, M4 Taps
$895.00
Today
FPD510-FS-VIS Support Documentation
FPD510-FS-VISSi Fixed Gain, High Sensitivity PIN Detector, 400 - 1000 nm, 250 MHz BW, 0.13 mm2, M4 Tap
$1,705.00
Today
FPD610-FS-VIS Support Documentation
FPD610-FS-VISSi Fixed Gain, High Sensitivity PIN Detector, 400 - 1000 nm, 600 MHz BW, 0.13 mm2, M4 Tap
$1,705.00
Today

Si Amplified Photodetectors, Switchable Gain

Item #a Housing Featuresb Wavelength Range Bandwidth Range Gain NEP Typical Performance Graphs Active Area
(Click Link for Image)
Operating Temperature Range Power Supply Included
Hi-Z Load 50 Ω Load
PDA100A2 320 - 1100 nm DC - 11 MHz 1.51 kV/A - 4.75 MV/Ac 0.75 kV/A - 2.38 MV/Ac 2.67 -
71.7 pW/Hz1/2
info 75.4 mm2
(Ø9.8 mm)
10 to 40 °C Yes
PDA36A2 350 - 1100 nm DC - 12 MHz 1.51 kV/A - 4.75 MV/Ac 0.75 kV/A - 2.38 MV/Ac 3.25 - 75.7 pW/Hz1/2 info 13 mm2
(3.6 mm x 3.6 mm)
d
10 to 40 °C Yes
FPD310-FS-VIS 400 - 1000 nm 1 - 1500 MHz - 2 x 103 -
2 x 104 Vpp/We
24.0 pW/Hz1/2 info 0.13 mm2
(Ø0.4 mm)
10 to 40 °C Yes
  • Click on the links to view photos of the items.
  • Click the icons for details.
  • Switchable with 8 x 10 dB Steps. Bandwidth varies inversely with gain.
  • The detector active area surface is flush with the front the housing.
  • Switchable with 2 steps, 0 and 20 dB.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PDA100A2 Support Documentation
PDA100A2Si Switchable Gain Detector, 320 - 1100 nm, 11 MHz BW, 75.4 mm2, Universal 8-32 / M4 Taps
$360.06
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PDA36A2 Support Documentation
PDA36A2Si Switchable Gain Detector, 350 - 1100 nm, 12 MHz BW, 13 mm2, Universal 8-32 / M4 Taps
$327.42
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+1 Qty Docs Part Number - Metric Price Available
FPD310-FS-VIS Support Documentation
FPD310-FS-VISSi Switchable Gain, High Sensitivity PIN Amplified Detector, 400 - 1000 nm, 1 MHz - 1.5 GHz BW, 0.13 mm2, M4 Taps
$1,705.00
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PDA Power Supply Cable

Pinout for Cable

The PDA-C-72 power cord is offered for the PDA line of amplified photodetectors when using with a power supply other than the one included with the detector. The cord has tinned leads on one end and a PDA-compatible 3-pin connector on the other end. It can be used to power the PDA series of amplified photodetectors with any power supply that provides a DC voltage. The pin descriptions are shown to the right.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PDA-C-72 Support Documentation
PDA-C-7272" PDA Power Supply Cable, 3-Pin Connector
$19.89
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±12 VDC Regulated Linear Power Supply

  • Replacement Power Supply for the PDA and PDF Amplified Photodetectors Sold Above
  • ±12 VDC Power Output
  • Current Limit Enabling Short Circuit and Overload Protection
  • On/Off Switch with LED Indicator
  • Switchable AC Input Voltage (100, 120, or 230 VAC)
  • 2 m (6.6 ft) Cable with LUMBERG RSMV3 Male Connector
  • UL and CE Compliant

The LDS12B ±12 VDC Regulated Linear Power Supply is intended as a replacement for the supply that comes with our PDA and PDF line of amplified photodetectors sold on this page. The cord has three pins: one for ground, one for +12 V, and one for -12 V (see diagram above). A region-specific power cord is shipped with the LDS12B power supply based on your location. This power supply can also be used with the PDB series of balanced photodetectorsPMM series of photomultiplier modules,APD series of avalanche photodetectors, and the FSAC autocorrelator for femtosecond lasers.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LDS12B Support Documentation
LDS12B±12 VDC Regulated Linear Power Supply, 6 W, 100/120/230 VAC
$80.33
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Internally SM1-Threaded Fiber Adapters

These internally SM1-threaded (1.035"-40) adapters mate connectorized fiber to any of our externally SM1-threaded components, including our photodiode power sensors, our thermal power sensors, and our photodetectors. These adapters are compatible with the housing of the photodetectors on this page.

Item # S120-SMA S120-ST S120-SC S120-LC
Click Image to Enlarge S120-SMA S120-ST S120-SC S120-LC
Fiber Connector Typea SMA ST SC LC
Thread Internal SM1 (1.035"-40)
  • Other Connector Types Available upon Request
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
S120-SMA Support Documentation
S120-SMASMA Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$39.78
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S120-ST Support Documentation
S120-STST/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$39.78
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S120-SC Support Documentation
S120-SCSC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$49.98
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S120-LC Support Documentation
S120-LCLC/PC Fiber Adapter Cap with Internal SM1 (1.035"-40) Thread
$49.98
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Externally SM1-Threaded Fiber Adapters

Each disk has four dimples, two in the front surface and two in the back surface, that allow it to be tightened from either side with the SPW909 or SPW801 spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications when paired with SM1 lens tubes. Once the adapter is at the desired position, use an SM1RR retaining ring to secure it in place.

Item # SM1FC SM1FCAa SM1SMA SM1ST
Adapter Image
(Click the Image to Enlarge)
SM1FC SM1FCA SM1SMA SM1ST
Connector Type FC/PC FC/APC SMA ST/PC
Threading External SM1 (1.035"-40)
  • Please note that the SM1FCA has a mechanical angle of only 4°, even though the standard angle for these connectors is 8°. There is a 4° angle of deflection caused by the glass-air interface; when combined with the 4° mechanical angle, the output beam is aligned perpendicular to the adapter face.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1FC Support Documentation
SM1FCFC/PC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$29.58
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SM1FCA Support Documentation
SM1FCAFC/APC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$31.37
Today
SM1SMA Support Documentation
SM1SMASMA Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$29.58
Today
SM1ST Support Documentation
SM1STST/PC Fiber Adapter Plate with External SM1 (1.035"-40) Thread
$28.42
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