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FiberBench Beamsplitter Modules


  • Polarizing Cube or Non-Polarizing Plate Beamsplitters
  • Available for Wavelengths from 600 nm to 6.0 µm
  • Kinematic and Rotation Base Designed for FiberBench Systems

FBT-PBS052

Polarizing Beamsplitter Module
for 620 - 1000 nm

Application Idea

Kinematic Polarizing Cube Beamsplitter Module and an FBR-LPNIR Polarizer Module Mounted in a FiberBench with MIR FiberPorts

FBT-50MIR

Non-Polarizing Beamsplitter Module
for 1.0 - 6.0 µm

Related Items


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Click to Enlarge
The included hex key and spanner wrench can be used to lock an adjustment screw in place.

Click to Enlarge
Each beamsplitter optic is mounted on a kinematic base with tip, tilt, and fine rotation adjustment screws.
Download a FiberBench Assembly File

Features

  • Polarizing Beamsplitter Cubes with >1000:1 Extinction Ratio
  • Non-Polarizing 4:96 or 50:50 Plate Beamsplitters
  • Beamsplitters Glued onto Thorlabs' Versatile Kinematic Tip/Tilt and Rotation Stages
    • 360° Continuous Rotation with ±12° Fine Adjustment
    • ±3° Tip/Tilt Adjustment via Three M2.5 x 0.2 Precision Adjusters
    • Lockable Adjusters with Included Spanner Wrench
  • Compatible with FiberBenches
  • Special Wavelengths or Custom Requests Available through Tech Support

For applications that require a beam to be split or reflected, Thorlabs offers polarizing beamsplitter cubes and non-polarizing beamsplitter plates mounted on kinematic bases that are compatible with our FiberBench systems. The bases provide tip, tilt, and rotational adjustment for precision beam alignment and steering control.

The circular rotation plate can be rotated a full 360° and is engraved with a scale marked every 5°. Additionally, a Vernier scale provides 1° resolution for fine rotation. Coarse rotation should be performed using the included hex key and the indentations in the rotating plate to avoid touching the optic. When engaged, the fine rotation adjustment screw gives up to ±12° adjustment.

FiberBench Beamsplitter Module Features

Three easily accessible adjustment screws control the tip/tilt of the mount (see animation and photo to the right), yielding up to ±3° of adjustment. The screws can also provide some vertical translation when all three screws are rotated by the same amount. A physical stop prevents the tip/tilt springs from being overextended.

All adjustment screws use a 0.05" (1.3 mm) hex key, which is included with these mounts. Each adjuster can be locked into position with the included locking collars and spanner wrench to prevent accidental movement. Simply insert the hex key through the spanner wrench, and while holding the adjustment screw static, use the spanner wrench to tighten the locking collar (see the the animation to the right). Replacement collars and spanner wrenches are also available below.

These mounts do not suffer from left/right handedness restrictions, and thus can be used in any orientation on a FiberBench. The base of each non-polarizing beamsplitter module is engraved with a dot to mark the beamsplitting side of the optic, while the beamsplitter cube modules offer a dot on the top face indicating recommended entrance faces. Each module features two Ø0.125" (Ø3.2 mm) dowel pins which are compatible with Thorlabs' FiberBenches. Please contact Tech Support for special wavelengths. These beamsplitter modules can be used alongside FiberBench-compatible polarization, tweaker, and mirror modules.

FiberBench Accessories
FiberPorts Optic Mounts Alignment Tools Polarizers
Beamsplitter Modules Mirror Modules Rotating Wave Plates FiberBenches

Polarizing Beamsplitter Cubes

Specifications
AR Coating Reflection Ravg <0.5% at 0° AOI
Beamsplitter Dimensions 5 mm Cube
Dimensional Tolerance ±0.25 mm
Material N-SF1
Extinction Ratio TP:TS >1000:1
Transmission Efficiencya TP >90%
Reflection Efficiencya RS >99.5%
Transmitted Beam Deviation 0° ± 5 arcmin
Reflected Beam Deviation 90° ± 5 arcmin
Clear Aperture >Ø3.25 mm
Surface Flatness λ/4 at 633 nm
Transmitted Wavefront Distortion ≤λ/4 at 633 nm
Surface Quality 40-20 Scratch-Dig
  • Transmission and reflection data is based on that of the beamsplitter coating and does not account for the BBAR surface coating.
Item # Item # of
Mounted Optic
Coating Range Damage Threshold
FBT-PBS052 PBS052 620 - 1000 nm CWa 50 W/cm at 810 nm, Ø0.019 mm
Pulsed 2 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.166 mm
FBT-PBS053 PBS053 900 - 1300 nm CWa,b 2000 W/cm at 1064 nm, Ø0.018 mm
Pulsed 2 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø0.484 mm
FBT-PBS054 PBS054 1200 - 1600 nm CWa,b 2000 W/cm at 1542 nm, Ø0.033 mm
Pulsed 5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.181 mm
  • The power density of your beam should be calculated in terms of W/cm. For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see the Damage Thresholds tab.
  • The stated damage threshold is a certification measurement, as opposed to a true damage threshold (i.e., the optic was able to withstand the maximum output of the laser with no damage).
Polarizing Beamsplitting Cube
Polarizing Beamsplitting Cube

Non-Polarizing Plate Beamsplitters


50:50 Beamsplitters: The surface with the beamsplitter coating should face the incident beam.
Item # FBT-50NIR FBT-50MIR FBT-BSF-B FBT-BSF-C
Transmission Efficiency 50 ± 10%a 50 ± 20%c 96%e
Reflection Efficiency 50 ± 10%b 50 ± 20%d 4%e
Beam Displacement ~ 0.5 mm
Clear Aperture (45° AOI) >Ø3.0 mm
Transmitted Wavefront Distortion ≤λ/10 @ 633 nm ≤λ/8 @ 633 nm ≤λ/10 @ 633 nm
Optic Substratef Fused Silica Calcium Fluoride Fused Silica
Plate Thickness 1.0 mm
Surface Quality (Scratch-Dig) 20-10 40-20 20-10
  • TS-TP < 40%
  • RS-RP < 40%
  • TS-TP < 35%
  • RS-RP < 35%
  • The mirrors are optimized for use at a 45° AOI. Please refer to the Graphs tab for more information.
  • Click the substrate for detailed information.
Beam Sampler
4:96 Beamsplitters: The beam is sampled by reflecting a small percentage of the incident light from the uncoated surface.
Item # Coating Range Damage Threshold
FBT-50NIR 600 - 1700 nma 6 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø0.515 mm
FBT-50MIR 1.0 - 6.0 µma CW: 100 W/cm2 at 2.1 µm, Ø0.027 mm
Pulsed: 0.5 J/cm2 at 2.1 µm, 30 ns, 167 Hz, Ø0.027 mm
FBT-BSF-B 650 - 1050 nmb 7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.133 mm
FBT-BSF-C 1050 - 1700 nmb 7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.189 mm
  • Beamsplitter Coating Range (See 50:50 Beamsplitter Diagram to the Right)
  • AR Coating Range (See 4:96 Beamsplitter Diagram to the Right)

The following graphs show beam transmission percentages for each of our beamsplitter modules. The blue-shaded regions indicate the operating wavelength range of each beamsplitter. Performance outside of this range is not guaranteed.

Polarizing Beamsplitter Modules


Click to Enlarge
The performance is limited by the beamsplitter coating. The faces of the PBS052 Beamsplitter Cube are AR coated over the 620 - 1000 nm wavelength range to increase transmission.

Click to Enlarge
The performance is limited by the beamsplitter coating. The faces of the PBS053 Beamsplitter Cube are AR coated over the 900 - 1300 nm wavelength range to increase transmission.

Click to Enlarge
The performance is limited by the beamsplitter coating. The faces of the PBS054 Beamsplitter Cube are AR coated over the 1200 - 1600 nm wavelength range to increase transmission.

Non-Polarizing 50:50 Beamsplitter Modules


Click to Enlarge
The performance is limited by the beamsplitter coating. The rear face of the plate beamsplitter is AR coated over the 600 - 1700 nm wavelength range to increase transmission and minimize back reflections.

Click to Enlarge
The performance is limited by the beamsplitter coating. The rear face of the plate beamsplitter is AR coated over the 1 - 6 μm wavelength range to increase transmission and minimize back reflections.

Non-Polarizing 4:96 Beamsplitter Modules


Click to Enlarge

The sampled beam is reflected from the uncoated surface of the beam sampler. The plot above shows the percent of the incident beam reflected by the uncoated surface of the optic over a range of incident angles. The mirrors are optimized for use at a 45° AOI.

Click to Enlarge

The back surface of the beam sampler is AR coated for 650 - 1050 nm, minimizing back reflections of the transmitted beam at this surface.

Click to Enlarge

The sampled beam is reflected from the uncoated surface of the beam sampler. The plot above shows the percent of the incident beam reflected by the uncoated surface of the optic over a range of incident angles. The mirrors are optimized for use at a 45° AOI.

Click to Enlarge

The back surface of the beam sampler is AR coated for 1050 - 1700 nm, minimizing back reflections of the transmitted beam at this surface.
Item # Damage Threshold
Polarizing Beamsplitters
FBT-PBS052 CWa 50 W/cm at 810 nm, Ø0.019 mm
Pulsed 2 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.166 mm
FBT-PBS053 CWa,b 2000 W/cm at 1064 nm, Ø0.018 mm
Pulsed 2 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø0.484 mm
FBT-PBS054 CWa,b 2000 W/cm at 1542 nm, Ø0.033 mm
Pulsed 5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.181 mm
Non-Polarizing Beamsplitters
FBT-50NIR Pulsed 6 J/cm2 at 1064 nm, 10 ns, 10 Hz, Ø0.515 mm
FBR-50MIR CW 100 W/cm2 at 2.1 µm, Ø0.027 mm
Pulsed 0.5 J/cm2 at 2.1 µm, 30 ns, 167 Hz, Ø0.027 mm
FBT-BSF-B Pulsed 7.5 J/cm2 at 810 nm, 10 ns, 10 Hz, Ø0.133 mm
FBT-BSF-C Pulsed 7.5 J/cm2 at 1542 nm, 10 ns, 10 Hz, Ø0.189 mm
  • The power density of your beam should be calculated in terms of W/cm. For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see below.
  • The stated damage threshold is a certification measurement, as opposed to a true damage threshold (i.e., the optic was able to withstand the maximum output of the laser with no damage).

Damage Threshold Data for Thorlabs' FiberBench Beamsplitter Modules

The specifications to the right are measured data for the beamsplitters mounted in Thorlabs' beamsplitter modules.

 

Laser Induced Damage Threshold Tutorial

The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS 11254 and ISO 21254 specifications.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for 30 seconds (CW) or for a number of pulses (pulse repetition frequency specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence # of Tested Locations Locations with Damage Locations Without Damage
1.50 J/cm2 10 0 10
1.75 J/cm2 10 0 10
2.00 J/cm2 10 0 10
2.25 J/cm2 10 1 9
3.00 J/cm2 10 1 9
5.00 J/cm2 10 9 1

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions.

When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Beam diameter of your beam (1/e2)
  3. Approximate intensity profile of your beam (e.g., Gaussian)
  4. Linear power density of your beam (total power divided by 1/e2 beam diameter)

Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. Average linear power density can be calculated using the equation below. 

The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm):

CW Wavelength Scaling

While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application. 

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the relevant pulse lengths for our specified LIDT values.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Duration t < 10-9 s 10-9 < t < 10-7 s 10-7 < t < 10-4 s t > 10-4 s
Damage Mechanism Avalanche Ionization Dielectric Breakdown Dielectric Breakdown or Thermal Thermal
Relevant Damage Specification No Comparison (See Above) Pulsed Pulsed and CW CW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why expressing the LIDT as an energy density provides the best metric for short pulse sources. In this regime, the LIDT given as an energy density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum energy density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm², scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1998).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

In order to illustrate the process of determining whether a given laser system will damage an optic, a number of example calculations of laser induced damage threshold are given below. For assistance with performing similar calculations, we provide a spreadsheet calculator that can be downloaded by clicking the button to the right. To use the calculator, enter the specified LIDT value of the optic under consideration and the relevant parameters of your laser system in the green boxes. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. These values are used to calculate adjusted, scaled LIDT values for the optics based on accepted scaling laws. This calculator assumes a Gaussian beam profile, so a correction factor must be introduced for other beam shapes (uniform, etc.). The LIDT scaling laws are determined from empirical relationships; their accuracy is not guaranteed. Remember that absorption by optics or coatings can significantly reduce LIDT in some spectral regions. These LIDT values are not valid for ultrashort pulses less than one nanosecond in duration.

Intensity Distribution
A Gaussian beam profile has about twice the maximum intensity of a uniform beam profile.

CW Laser Example
Suppose that a CW laser system at 1319 nm produces a 0.5 W Gaussian beam that has a 1/e2 diameter of 10 mm. A naive calculation of the average linear power density of this beam would yield a value of 0.5 W/cm, given by the total power divided by the beam diameter:

CW Wavelength Scaling

However, the maximum power density of a Gaussian beam is about twice the maximum power density of a uniform beam, as shown in the graph to the right. Therefore, a more accurate determination of the maximum linear power density of the system is 1 W/cm.

An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. CW damage threshold values typically scale directly with the wavelength of the laser source, so this yields an adjusted LIDT value:

CW Wavelength Scaling

The adjusted LIDT value of 350 W/cm x (1319 nm / 1550 nm) = 298 W/cm is significantly higher than the calculated maximum linear power density of the laser system, so it would be safe to use this doublet lens for this application.

Pulsed Nanosecond Laser Example: Scaling for Different Pulse Durations
Suppose that a pulsed Nd:YAG laser system is frequency tripled to produce a 10 Hz output, consisting of 2 ns output pulses at 355 nm, each with 1 J of energy, in a Gaussian beam with a 1.9 cm beam diameter (1/e2). The average energy density of each pulse is found by dividing the pulse energy by the beam area:

Pulse Energy Density

As described above, the maximum energy density of a Gaussian beam is about twice the average energy density. So, the maximum energy density of this beam is ~0.7 J/cm2.

The energy density of the beam can be compared to the LIDT values of 1 J/cm2 and 3.5 J/cm2 for a BB1-E01 broadband dielectric mirror and an NB1-K08 Nd:YAG laser line mirror, respectively. Both of these LIDT values, while measured at 355 nm, were determined with a 10 ns pulsed laser at 10 Hz. Therefore, an adjustment must be applied for the shorter pulse duration of the system under consideration. As described on the previous tab, LIDT values in the nanosecond pulse regime scale with the square root of the laser pulse duration:

Pulse Length Scaling

This adjustment factor results in LIDT values of 0.45 J/cm2 for the BB1-E01 broadband mirror and 1.6 J/cm2 for the Nd:YAG laser line mirror, which are to be compared with the 0.7 J/cm2 maximum energy density of the beam. While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system.

Pulsed Nanosecond Laser Example: Scaling for Different Wavelengths
Suppose that a pulsed laser system emits 10 ns pulses at 2.5 Hz, each with 100 mJ of energy at 1064 nm in a 16 mm diameter beam (1/e2) that must be attenuated with a neutral density filter. For a Gaussian output, these specifications result in a maximum energy density of 0.1 J/cm2. The damage threshold of an NDUV10A Ø25 mm, OD 1.0, reflective neutral density filter is 0.05 J/cm2 for 10 ns pulses at 355 nm, while the damage threshold of the similar NE10A absorptive filter is 10 J/cm2 for 10 ns pulses at 532 nm. As described on the previous tab, the LIDT value of an optic scales with the square root of the wavelength in the nanosecond pulse regime:

Pulse Wavelength Scaling

This scaling gives adjusted LIDT values of 0.08 J/cm2 for the reflective filter and 14 J/cm2 for the absorptive filter. In this case, the absorptive filter is the best choice in order to avoid optical damage.

Pulsed Microsecond Laser Example
Consider a laser system that produces 1 µs pulses, each containing 150 µJ of energy at a repetition rate of 50 kHz, resulting in a relatively high duty cycle of 5%. This system falls somewhere between the regimes of CW and pulsed laser induced damage, and could potentially damage an optic by mechanisms associated with either regime. As a result, both CW and pulsed LIDT values must be compared to the properties of the laser system to ensure safe operation.

If this relatively long-pulse laser emits a Gaussian 12.7 mm diameter beam (1/e2) at 980 nm, then the resulting output has a linear power density of 5.9 W/cm and an energy density of 1.2 x 10-4 J/cm2 per pulse. This can be compared to the LIDT values for a WPQ10E-980 polymer zero-order quarter-wave plate, which are 5 W/cm for CW radiation at 810 nm and 5 J/cm2 for a 10 ns pulse at 810 nm. As before, the CW LIDT of the optic scales linearly with the laser wavelength, resulting in an adjusted CW value of 6 W/cm at 980 nm. On the other hand, the pulsed LIDT scales with the square root of the laser wavelength and the square root of the pulse duration, resulting in an adjusted value of 55 J/cm2 for a 1 µs pulse at 980 nm. The pulsed LIDT of the optic is significantly greater than the energy density of the laser pulse, so individual pulses will not damage the wave plate. However, the large average linear power density of the laser system may cause thermal damage to the optic, much like a high-power CW beam.


Posted Comments:
jjurado  (posted 2011-02-25 10:35:00.0)
Response from Javier at Thorlabs to ctnono: Thank you for contacting us with your request. I have sent a copy of the Autocad pdf drawing for the PSCLB-HR-1550 to your e-mail address.
ctnono  (posted 2011-02-24 22:26:27.0)
Dear, In item of PSCLB-HR-1550 series, your website of datasheet was broken. Could you please send it to me. Thanks a lot. Best Regards, Cugi Chang

Kinematic Polarizing Cube Beamsplitter Modules

Polarizing Beamsplitting Cube
  • Polarizing 5 mm Beamsplitter Cube Mounted on Kinematic Tip/Tilt and Rotation Base
  • Extinction Ratio >1000:1
  • Wavelength Ranges between 620 and 1600 nm

These modules consist of a polarizing beamsplitter cube mounted on an engraved FBTC base. These modules are useful for polarization-dependent measurements and applications that require a spatial beam overlap. The beamsplitter cube provides a polarization-dependent split with an extinction ratio that is better than 1000:1. For wavelengths besides the ones listed below, please contact Tech Support.

The base features two Ø0.125" (Ø3.2 mm) dowel pins which are compatible with Thorlabs' FiberBenches. Each module includes a hex key which can be used to adjust the tilt and rotation of the base and a spanner wrench which can lock each adjuster.

Key Optic Specificationsa
Item # Item # of
Mounted Optic
Wavelength Range Transmissionb
(Click for Graph)
Extinction Ratio Reflection
Efficiency
Transmission
Efficiency
Transmitted Wavefront
Distortion
Clear Aperture
FBT-PBS052 PBS052 620 - 1000 nm TP:TS > 1000:1 TS > 99.5% TP > 90% ≤λ/4 @ 633 nm >Ø3.25 mm
FBT-PBS053 PBS053 900 - 1300 nm
FBT-PBS054 PBS054 1200 - 1600 nm
  • For complete specifications, please see the Specs tab.
  • For more information, please see the Graphs tab.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FBT-PBS052 Support Documentation
FBT-PBS052Polarizing FiberBench Beamsplitter Module, 620 - 1000 nm
$441.50
5-8 Days
FBT-PBS053 Support Documentation
FBT-PBS053Polarizing FiberBench Beamsplitter Module, 900 - 1300 nm
$441.50
Lead Time
FBT-PBS054 Support Documentation
FBT-PBS054Polarizing FiberBench Beamsplitter Module, 1200 - 1600 nm
$441.50
Lead Time

Kinematic Non-Polarizing Plate Beamsplitter Modules, 50:50

Non-Polarizing Beamsplitting Plate
  • Non-Polarizing 50:50 Plate Beamsplitter Mounted on Kinematic Tip/Tilt and Rotation Base
  • Wavelength Ranges between 600 nm and 6.0 μm

These modules consist of a wideband non-polarizing plate beamsplitter mounted on an engraved FBTP base. They are useful for IR beam sampling applications or applications which require a 50:50 split at 45° AOI. For wavelengths besides the ones listed below, please contact Tech Support.

The base is engraved with a dot to mark the reflective side of the beamsplitter and features two Ø0.125" (Ø3.2 mm) dowel pins which are compatible with Thorlabs' FiberBenches. Each module includes a hex key which can be used to adjust the tilt and rotation of the base and a spanner wrench which can lock each adjuster.

Key Optic Specificationsa
Item # Wavelength
Range
Transmissionb
(Click for Graph)
Split Ratio
(Unpolarized Light)
Transmitted Wavefront
Distortion
Clear Aperture
(45° AOI)
Plate Beamsplitter Dimensions
FBT-50NIR 600 - 1700 nm 50:50 ≤λ/10 @ 633 nm >Ø3.0 mm Face Dimensions: 12.4 mm x 5.0 mm
Thickness: 1.0 mm
FBT-50MIR 1.0 - 6.0 µm ≤λ/8 @ 633 nm
  • For complete specifications, please see the Specs tab.
  • For more information, please see the Graphs tab.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FBT-50NIR Support Documentation
FBT-50NIR50:50 Fiberbench Beamsplitter Module, 600 - 1700 nm
$414.45
5-8 Days
FBT-50MIR Support Documentation
FBT-50MIR50:50 Fiberbench Beamsplitter Module, 1.0 - 6.0 µm
$485.87
Today

Kinematic Non-Polarizing Plate Beamsplitter Modules, 4:96

Beam Sampler
The beam is sampled by reflecting a small percentage of the incident light from the uncoated surface.
  • Non-Polarizing 4:96 (R:T) Plate Beamsplitter Mounted on Kinematic Tip/Tilt and Rotation Base
  • Wavelength Ranges between 650 and 1700 nm

These modules consist of a narrow-band non-polarizing plate beamsplitter mounted on an engraved FBTP base. They provide a 4:96 (R:T) split and are useful for beam sampling applications. For wavelengths besides the ones listed below, please contact Tech Support.

The incoming beam should be incident to the uncoated surface as illustrated in the diagram to the right. The base is engraved with a dot to mark the uncoated side of the beamsplitter, while the optic is engraved with a dot on the AR-coated surface. The base also features two Ø0.125" (Ø3.2 mm) dowel pins which are compatible with Thorlabs' FiberBenches. Each module includes a hex key which can be used to adjust the tilt and rotation of the base and a spanner wrench which can lock each adjuster.

Key Optic Specificationsa
Item # Wavelength
Range
Reflectanceb
(Click for Graph)
Split Ratio
(R:T, Unpolarized Light)
Transmitted Wavefront
Distortion
Clear Aperture
(45° AOI)
Plate Beamsplitter Dimensions
FBT-BSF-B 650 - 1050 nm 4:96 ≤λ/10 @ 633 nm >Ø3.0 mm Face Dimensions: 12.4 mm x 5.0 mm
Thickness: 1.0 mm
FBT-BSF-C 1050 - 1700 nm
  • For complete specifications, please see the Specs tab.
  • This is the reflectance of the uncoated surface. For more information, please see the Graphs tab.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
FBT-BSF-B Support Documentation
FBT-BSF-B4:96 FiberBench Beamsplitter Module, 650 - 1050 nm
$414.45
Today
FBT-BSF-C Support Documentation
FBT-BSF-C4:96 FiberBench Beamsplitter Module, 1050 - 1700 nm
$414.45
Today

Replacement Locking Collars and Spanner Wrenches for Tip/Tilt Rotation Mounts

Stop Collar Jam Nut
Click to Enlarge

Two Collars Can be Locked Together to Create a Hard Stop
Stop Collar Lock Nut
Click to Enlarge

A Single Locking Collar Can Lock an Adjuster in Position
  • Extremely Compact Lock Nut: 0.07" (1.7 mm) Thick
  • Use One Collar to Lock an Adjuster to a Bushing
  • Use Two Collars to Create a Hard Stop on an Adjuster
  • Sold in Packages of Five
  • Install and Remove with the SPW403 Spanner Wrench, Sold Below

These locking collars are compatible with the adjusters used in all of the modules sold above, as well as all of our other M2.5 x 0.20 adjusters. They are only 0.07" (1.7 mm) thick and are constructed of 303 stainless steel.  

As shown in the photos to the right, they can be used to lock an adjuster in a desired position, or to create a hard stop at any position to prevent overdriving an adjuster. In addition to using two collars to create a hard stop, as shown in the photo to the far right, a single collar can be epoxied to an adjuster using our G14250 epoxy to create a permanent hard stop. We recommend the SPW403 Spanner Wrench to install or remove these locking collars. The end of the SPW403 is machined to accept a 5/64" hex wrench, which can be used to provide additional torque. The hollow cylindrical construction of the SPW403 allows a tool to pass through the entire length of the spanner wrench and access the adjuster.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
F10SC1-5 Support Documentation
F10SC1-5Locking Collar for M2.5 x 0.20 Adjusters, 5 Pack
$28.95
Today
SPW403 Support Documentation
SPW403Spanner Wrench for FiberPort Zθ Locking Collars and F10SC1-5 M2.5 x 0.20 Locking Collars
$27.06
Today
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