Engineered Diffusers™ Tutorial

Overview
Graphs
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Illustration of Experimental Detector Path

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Illustration of the Detector Path through the Beam Profiles

Experimental Set Up

Item #	Qty	Description
Sources and Heat Sinks
LP488-SF20	1	488 nm, 20 mW, B Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP637-SF70	1	637 nm, 70 mW, G Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP785-SF100	1	785 nm, 100 mW, H Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
DBR1064S	1	1064 nm, 40 mW, Butterfly DBR Laser, SM Fiber, FC/APC, Internal Isolator
LDM9LP	1	LD/TEC Mount for Thorlabs Fiber-Pigtailed Laser Diodes
LM14S2	1	Universal 14-Pin Butterfly Laser Diode Mount
Collimators and Associated Mounts
TC06FC-543	1	543 nm, f=5.96 mm, NA=0.28, FC/PC Triplet Collimator
TC06FC-633	1	633 nm, f=6.01 mm, NA=0.28, FC/PC Triplet Collimator
TC06APC-780	1	780 nm, f=6.06 mm, NA=0.28, FC/APC Triplet Collimator
TC06APC-1064	1	1060 nm, f=6.12 mm, NA=0.28, FC/APC Triplet Collimator
KAD12F	1	SM1-Threaded Kinematic Pitch/Yaw Adapter for Ø12 mm Cylindrical Components
LMR1	1	Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
TR3	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH3	1	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3"
R2	1	Slip-On Post Collar for Ø1/2" Posts, 1/4"-20 Thumbscrew
Engineered Diffusers and Associated Mounts
ED1-C20	1	Ø1" 20° Circle Pattern Diffuser
ED1-C50	1	Ø1" 50° Circle Pattern Diffuser
ED1-S20	1	Ø1" 20° Square Pattern Diffuser
ED1-S50	1	Ø1" 50° Square Pattern Diffuser
CP33	1	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
TR3	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH2	1	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
R2	1	Slip-On Post Collar for Ø1/2" Posts, 1/4"-20 Thumbscrew
CR1	1	Continuous Rotation Stage
CR1A	1	CR1 Adapter Plate
Collection Lens and Associated Mounts
LA1304-ML	1	Ø1/2" N-BK7 Plano-Convex Lens, SM05-Threaded Mount, f = 40 mm, Uncoated
SM05L20	1	SM05 Lens Tube, 2" Thread Depth, One Retaining Ring Included
SM05RC	1	Slip Ring for SM05 Lens Tubes, 8-32 Tap
TR3	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH6	1	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 6"
Detector and Associated Mounts
SM05PD1A	1	Large Area Mounted Silicon Photodiode, 350-1100 nm, Cathode Grounded
SMR05	1	Ø1/2" Lens Mount with SM05 Internal Threads and No Retaining Lip, 8-32 Tap
SM05D5D	1	SM05 Ring-Actuated Iris Diaphragm (Ø0.7 - Ø5 mm)
TR2	2	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
MFF101	1	Motorized Filter Flip Mount with Ø1" Optic Holder, 8-32 Tap
LMR05	2	Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap
TR3	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
RA90	2	Right-Angle Clamp for Ø1/2" Posts, 3/16" Hex
PH4	1	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4"
TR6	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 6"
Stages and General Parts
PBG3648F	1	UltraLight Breadboard, 36" x 48" x 0.98", 1/4"-20 Taps
MP100	1	Rigid Stand with Platform, Adjustment Height: 148.1 - 208.5 mm
NR360S	1	NanoRotator Stage with SM2-Threaded Center Hole
XT34-500	1	34 mm Construction Rail, L = 500 mm
XT34D2-30	6	30 mm Long XT34 Platform with One 1/4" (M6) Counterbore
XT34C2	6	Double Dovetail Clamp for 34 mm Rails, 30 mm Long
FSR1	1	Storage Reel for Patch Cables with Ø900 µm Jackets
T743-1.0	1	High-Performance Black Masking Tape, 1" x 180' (25 mm x 55 m) Roll
Controllers and Drivers
TED200C	1	Benchtop Temperature Controller, ±2 A / 12 W
LDC205C	1	Benchtop LD Current Controller, ±500 mA HV
BSC201	1	One-Channel Benchtop Stepper Motor Controller

View Metric Product List

Item #	Qty	Description
Sources and Heat Sinks
LP488-SF20	1	488 nm, 20 mW, B Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP637-SF70	1	637 nm, 70 mW, G Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP785-SF100	1	785 nm, 100 mW, H Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
DBR1064S	1	1064 nm, 40 mW, Butterfly DBR Laser, SM Fiber, FC/APC, Internal Isolator
LDM9LP	1	LD/TEC Mount for Thorlabs Fiber-Pigtailed Laser Diodes
LM14S2	1	Universal 14-Pin Butterfly Laser Diode Mount
Collimators and Associated Mounts
TC06FC-543	1	543 nm, f=5.96 mm, NA=0.28, FC/PC Triplet Collimator
TC06FC-633	1	633 nm, f=6.01 mm, NA=0.28, FC/PC Triplet Collimator
TC06APC-780	1	780 nm, f=6.06 mm, NA=0.28, FC/APC Triplet Collimator
TC06APC-1064	1	1060 nm, f=6.12 mm, NA=0.28, FC/APC Triplet Collimator
KAD12F	1	SM1-Threaded Kinematic Pitch/Yaw Adapter for Ø12 mm Cylindrical Components
LMR1/M	1	Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
TR75/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH75/M	1	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=75 mm
R2/M	1	Slip-On Post Collar for Ø1/2" Posts, M6 Thumbscrew
Engineered Diffusers and Associated Mounts
ED1-C20	1	Ø1" 20° Circle Pattern Diffuser
ED1-C50	1	Ø1" 50° Circle Pattern Diffuser
ED1-S20	1	Ø1" 20° Square Pattern Diffuser
ED1-S50	1	Ø1" 50° Square Pattern Diffuser
CP33/M	1	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
TR75/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH50/M	1	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
CR1/M	1	Continuous Rotation Stage - Metric
CR1A/M	1	CR1/M Adapter Plate
R2/M	1	Slip-On Post Collar for Ø1/2" Posts, M6 Thumbscrew
Collection Lens and Associated Mounts
LA1304-ML	1	Ø1/2" N-BK7 Plano-Convex Lens, SM05-Threaded Mount, f = 40 mm, Uncoated
SM05L20	1	SM05 Lens Tube, 2" Thread Depth, One Retaining Ring Included
SM05RC/M	1	Slip Ring for SM05 Lens Tubes, M4 Tap
TR75/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH150/M	1	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=150 mm
Detector and Associated Mounts
SM05PD1A	1	Large Area Mounted Silicon Photodiode, 350-1100 nm, Cathode Grounded
SMR05/M	1	Ø1/2" Lens Mount with SM05 Internal Threads and No Retaining Lip, M4 Tap
SM05D5D	1	SM05 Ring-Actuated Iris Diaphragm (Ø0.7 - Ø5 mm)
TR50/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
MFF101/M	1	Motorized Filter Flip Mount with Ø1" Optic Holder, M4 Tap
LMR05/M	2	Lens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap
TR75/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
RA90/M	2	Right-Angle Clamp for Ø1/2" Posts, 5 mm Hex
PH100/M	1	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm
TR150/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 150 mm
Stages and General Parts
MP100	1	Rigid Stand with Platform, Adjustment Height: 148.1 - 208.5 mm
XT34-500	1	34 mm Construction Rail, L = 500 mm
XT34D2-30	6	30 mm Long XT34 Platform with One 1/4" (M6) Counterbore
XT34C2	6	Double Dovetail Clamp for 34 mm Rails, 30 mm Long
T743-1.0	1	High-Performance Black Masking Tape, 1" x 180' (25 mm x 55 m) Roll
FSR1	1	Storage Reel for Patch Cables with Ø900 µm Jackets
NR360S	1	NanoRotator Stage with SM2-Threaded Center Hole
Controllers and Drivers
TED200C	1	Benchtop Temperature Controller, ±2 A / 12 W
LDC205C	1	Benchtop LD Current Controller, ±500 mA HV
BSC201	1	One-Channel Benchtop Stepper Motor Controller

Note: High Performance Black Masking Tape was used to cover metal which might reflect laser light. A MFF101 Motorized Flipper with an empty LMR05 is not being used.

Light Preparation
Wavelength (nm)	488	637	785	1064
Source	LP488-SF20	LP637-SF70	LP785-SF100	DBR1064S
Heat Sink	LDM9LP			LM14S2
Collimator	TC06FC-543	TC06FC-633	TC06APC-780	TC06APC-1064

Introduction
Engineered Diffusers are designed to create non-Gaussian intensity distributions in cicular or square beam profiles that diverge from the plane of incidence. The Graphs tab on this page has both theoretical approximations of the intensity through the center of the diverging beam profile when illuminating the engineered diffusers with a 633 nm collimated beam and data compiled from independent tests with laser wavelengths of 488 nm, 637 nm, 785 nm, and 1064 nm. These tests demonstrate the change in output profile with wavelength between diffusers across wavelengths.

Procedure
Four wavelenghts of light were chosen for study: 488 nm, 637 nm, 785 nm, and 1064 nm. These were prepared using the equipment to the right (a full list of all parts used can be found under the photo of the Experimental Set Up). The optical path was approximately 35 cm above the surface of the breadboard; it began when fiber-coupled light sources were collimated with triplet collimators, using a design wavelength as close to the source wavelength as possible. In free space, the beams were incident upon one of the Engineered Diffusers. The exiting divergent profile was isolated and focused by an with an LA1304 plano-convex lens attached to an SM05L20 lens tube. The signal was sampled every 0.5° by a SM05PD1A photodiode. This assembly was mounted on the end of an XT34-500 rail. The opposite end of the rail was mounted to a NR360S rotation stage centered with the engineered diffuser under test in order to sweep the detector and lens assembly through the center of the profile, as illustrated in the diagram to the upper right, and plot normalized intensity versus output angle. The distance between the diffuser and the detector was approximately 43 cm. The output angle was defined with respect to the original optical axis when the diffuser was not within the path. In order to control for ambient light, a 1 kHz sine wave was used to modulate the drive current applied to the laser diode and the signal was acquired with a lock-in amplifier. A LabVIEW program was written to control the setup and acquire the data.

Experimental Limitations
Only one of each Item # was tested^a. Stability may have been compromised by the experiment being performed on a PBG11113^b breadboard without any isolation. Only the middle of each diffuse shape was measured, so variances in other areas of the shape are possible, including the corners of the square profiles.

Results
It was found that there was little variance in diffuse beam profile with respect to wavelength across the middle of each beam profile. In the Graphs tab, there are data compiled from independent tests with various laser wavelengths to verify the theoretical models. The same graphs can be found in the table below.

The ED1-L4100 was not tested.
This is a previous generation item. Please see the PBG3648F for an up-to-date replacement.

	Item #	Experimental	Raw Data
Circular Paterns	ED1-C20		Click Here
Circular Paterns	ED1-C50		Click Here
Square Patterns	ED1-S20		Click Here
Square Patterns	ED1-S50		Click Here
Line Pattern	ED1-L4100	Not Avalible	Not Avalible