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Engineered Diffusers™ Tutorial


Engineered Diffusers™ Tutorial


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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
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View Imperial Product List
Item #QtyDescription
Sources and Heat Sinks
LP488-SF201488 nm, 20 mW, B Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP637-SF701637 nm, 70 mW, G Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP785-SF1001785 nm, 100 mW, H Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
DBR1064S11064 nm, 40 mW, Butterfly DBR Laser, SM Fiber, FC/APC, Internal Isolator
LDM9LP1LD/TEC Mount for Thorlabs Fiber-Pigtailed Laser Diodes
LM14S21Universal 14-Pin Butterfly Laser Diode Mount
Collimators and Associated Mounts
TC06FC-5431543 nm, f=5.96 mm, NA=0.28, FC/PC Triplet Collimator
TC06FC-6331633 nm, f=6.01 mm, NA=0.28, FC/PC Triplet Collimator
TC06APC-7801780 nm, f=6.06 mm, NA=0.28, FC/APC Triplet Collimator
TC06APC-106411060 nm, f=6.12 mm, NA=0.28, FC/APC Triplet Collimator
KAD12F1SM1-Threaded Kinematic Pitch/Yaw Adapter for Ø12 mm Cylindrical Components
LMR11Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH31Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3"
R21Slip-On Post Collar for Ø1/2" Posts, 1/4"-20 Thumbscrew
Engineered Diffusers and Associated Mounts
ED1-C201Ø1" 20° Circle Pattern Diffuser
ED1-C501Ø1" 50° Circle Pattern Diffuser
ED1-S201Ø1" 20° Square Pattern Diffuser
ED1-S501Ø1" 50° Square Pattern Diffuser
CP331SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
R21Slip-On Post Collar for Ø1/2" Posts, 1/4"-20 Thumbscrew
CR11Continuous Rotation Stage
CR1A1CR1 Adapter Plate
Collection Lens and Associated Mounts
LA1304-ML1Ø1/2" N-BK7 Plano-Convex Lens, SM05-Threaded Mount, f = 40.0 mm, Uncoated
SM05L201SM05 Lens Tube, 2" Thread Depth, One Retaining Ring Included
SM05RC1Slip Ring for SM05 Lens Tubes, 8-32 Tap
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PH61Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 6"
Detector and Associated Mounts
SM05PD1A1Large Area Mounted Silicon Photodiode, 350-1100 nm, Cathode Grounded
SMR051Ø1/2" Lens Mount with SM05 Internal Threads and No Retaining Lip, 8-32 Tap
SM05D5D1SM05 Ring-Actuated Iris Diaphragm (Ø0.7 - Ø5 mm)
TR22Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
MFF1011Motorized Filter Flip Mount with Ø1" Optic Holder, 8-32 Tap
LMR052Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
RA902Right-Angle Clamp for Ø1/2" Posts, 3/16" Hex
PH41Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4"
TR61Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 6"
Stages and General Parts
PBG3648F1UltraLight Breadboard, 36" x 48" x 0.98", 1/4"-20 Taps
MP1001Rigid Stand with Platform, Adjustment Height: 148.1 - 208.5 mm
NR360S1NanoRotator Stage with SM2-Threaded Center Hole
XT34-500134 mm Construction Rail, L = 500 mm
XT34D2-30630 mm Long XT34 Platform with One 1/4" (M6) Counterbore
XT34C26Double Dovetail Clamp for 34 mm Rails, 30 mm Long
FSR11Storage Reel for Patch Cables with Ø900 µm Jackets
T743-1.01High-Performance Black Masking Tape, 1" x 180' (25 mm x 55 m) Roll
Controllers and Drivers
TED200C1Benchtop Temperature Controller, ±2 A / 12 W
LDC205C1Benchtop LD Current Controller, ±500 mA HV
BSC2011One-Channel APT™ Benchtop Stepper Motor Controller
View Metric Product List
Item #QtyDescription
Sources and Heat Sinks
LP488-SF201488 nm, 20 mW, B Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP637-SF701637 nm, 70 mW, G Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
LP785-SF1001785 nm, 100 mW, H Pin Code, SM Fiber-Pigtailed Laser Diode, FC/PC
DBR1064S11064 nm, 40 mW, Butterfly DBR Laser, SM Fiber, FC/APC, Internal Isolator
LDM9LP1LD/TEC Mount for Thorlabs Fiber-Pigtailed Laser Diodes
LM14S21Universal 14-Pin Butterfly Laser Diode Mount
Collimators and Associated Mounts
TC06FC-5431543 nm, f=5.96 mm, NA=0.28, FC/PC Triplet Collimator
TC06FC-6331633 nm, f=6.01 mm, NA=0.28, FC/PC Triplet Collimator
TC06APC-7801780 nm, f=6.06 mm, NA=0.28, FC/APC Triplet Collimator
TC06APC-106411060 nm, f=6.12 mm, NA=0.28, FC/APC Triplet Collimator
KAD12F1SM1-Threaded Kinematic Pitch/Yaw Adapter for Ø12 mm Cylindrical Components
LMR1/M1Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH75/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=75 mm
R2/M1Slip-On Post Collar for Ø1/2" Posts, M6 Thumbscrew
Engineered Diffusers and Associated Mounts
ED1-C201Ø1" 20° Circle Pattern Diffuser
ED1-C501Ø1" 50° Circle Pattern Diffuser
ED1-S201Ø1" 20° Square Pattern Diffuser
ED1-S501Ø1" 50° Square Pattern Diffuser
CP33/M1SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
CR1/M1Continuous Rotation Stage - Metric
CR1A/M1CR1/M Adapter Plate
R2/M1Slip-On Post Collar for Ø1/2" Posts, M6 Thumbscrew
Collection Lens and Associated Mounts
LA1304-ML1Ø1/2" N-BK7 Plano-Convex Lens, SM05-Threaded Mount, f = 40.0 mm, Uncoated
SM05L201SM05 Lens Tube, 2" Thread Depth, One Retaining Ring Included
SM05RC/M1Slip Ring for SM05 Lens Tubes, M4 Tap
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PH150/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=150 mm
Detector and Associated Mounts
SM05PD1A1Large Area Mounted Silicon Photodiode, 350-1100 nm, Cathode Grounded
SMR05/M1Ø1/2" Lens Mount with SM05 Internal Threads and No Retaining Lip, M4 Tap
SM05D5D1SM05 Ring-Actuated Iris Diaphragm (Ø0.7 - Ø5 mm)
TR50/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
MFF101/M1Motorized Filter Flip Mount with Ø1" Optic Holder, M4 Tap
LMR05/M2Lens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
RA90/M2Right-Angle Clamp for Ø1/2" Posts, 5 mm Hex
PH100/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm
TR150/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 150 mm
Stages and General Parts
PBG515141UltraLight Breadboard, 900 x 1500 x 25 mm, M6 Taps
MP1001Rigid Stand with Platform, Adjustment Height: 148.1 - 208.5 mm
XT34-500134 mm Construction Rail, L = 500 mm
XT34D2-30630 mm Long XT34 Platform with One 1/4" (M6) Counterbore
XT34C26Double Dovetail Clamp for 34 mm Rails, 30 mm Long
T743-1.01High-Performance Black Masking Tape, 1" x 180' (25 mm x 55 m) Roll
FSR11Storage Reel for Patch Cables with Ø900 µm Jackets
NR360S1NanoRotator Stage with SM2-Threaded Center Hole
Controllers and Drivers
TED200C1Benchtop Temperature Controller, ±2 A / 12 W
LDC205C1Benchtop LD Current Controller, ±500 mA HV
BSC2011One-Channel APT™ 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 testeda. Stability may have been compromised by the experiment being performed on a PBG11113b 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 # Theoretical Experimental Raw Data
Circular Paterns ED1-C20 Click Here
ED1-C50 Click Here
Square Patterns ED1-S20 Click Here
ED1-S50 Click Here
Line Pattern ED1-L4100 Not Avalible Not Avalible

Circular Pattern Diffusers Transmitted Intensity Plots

diffuser, tophat transmitted intensity profile
Click to Enlarge

Theoretical Data for ED1-C20

diffuser, top hat transmission intensity
Click to Enlarge

Experimental Data for ED1-C20
Raw Data
diffuser, transmission, tophat intensity distribution
Click to Enlarge

Theoretical Data for D1-C50

diffuser, top hat transmission intensity
Click to Enlarge

Experimental Data for ED1-C50 
Raw Data

Square Pattern Diffusers Transmitted Intensity Plots

diffuser, tophat, transmission intensity
Click to Enlarge

Theoretical Data for ED1-S20

 
diffuser, top hat transmission intensity
Click to Enlarge

Experimental Data for ED1-S20
Raw Data

diffuser, top hat transmission intensity
Click to Enlarge

Theoretical Data for ED1-S50

 
diffuser, top hat transmission intensity
Click to Enlarge

Experimental Data for ED1-S50
Raw Data

Line Pattern Diffuser Transmitted Intensity Plot

diffuser, tophat transmission line profile
Click to Enlarge

Theoretical Data for ED1-L4100


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