PMMA Microlens Arrays


  • Plano-Convex Lens Shape
  • Rectangular Grid Arrangement of Microlenses
  • Uncoated or AR Coated
  • Mounted and Unmounted Versions

Application Idea

Use Microlens Arrays to transform a round collimated beam into a rectangular homogeneous spot.
See the Application tab for details.

MLA1

Unmounted Uncoated PMMA Microlens Array

MLA1M2

Mounted AR Coated PMMA Microlens Array

Related Items


Please Wait
Unmounted Item # MLA1 MLA11 MLA12
Mounted Item # MLA1M MLA1M1 MLA1M2
Substrate Material
(Click for Plot)
PMMA
Effective Focal Length 4.7 mm @ 850 nm
Lenslet Pitch 1.0 mm x 1.4 mm
Single Lens Radius 2.7 mm
AR Coating
(Click for Plot)
- 420 - 700 nm 650 - 1050 nm
Reflectance (Average) - <0.8%, 0° AOI <0.8%, 0° AOI
Array Size and Type
(Length x Height x Thickness)
10.0 mm x 9.8 mm x 1.2 mm
Rectangular Grid
Length and Height Tolerances
(Unmounted Versions Only)
±0.1 mm
Window Aperture
(Mounted Versions Only)
9.0 mm x 9.0 mm
Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.
Optic Cleaning Tutorial

Features

  • Polymethyl Methacrylate (PMMA) Substrate
  • 10.0 mm x 9.8 mm High-Quality Microlens Array
  • Available Unmounted or in a Ø1" Mount
  • Offered Uncoated or Broadband AR Coated
    • 420 - 700 nm with an AR Coating
    • 650 - 1050 nm with an AR Coating
  • Rectangular Grid Arrangement of Microlenses
  • Arrays with 1.0 mm x 1.4 mm Lenslet Pitches
  • 2.7 mm Single Lens Radius
  • Ideal for Producing a Square Spot with a Flat Top Profile

These PMMA Microlens Arrays (MLAs) are available mounted or unmounted. MLAs are excellent for homogenizing and shaping light, yielding a flat top profile output or square spot patterns. PMMA has excellent UV resistance, filtering out UV light less than 300 nm. The microlenses have a plano-convex shape and are arranged in a 10.0 mm by 9.8 mm rectangular grid with a lens pitch of 1.0 mm by 1.4 mm. These can be used in fly's eye homogenizers, where a round beam is transformed into a rectangular spot (see the Application tab for details).

For the mounted versions, the MLA is glued into a Ø1", 4.0 mm thick mount that is externally SM1-threaded (1.035"-40). The aperture of the lens window is 9.0 mm by 9.0 mm. The plate has slots that are compatible with a SPW602, SPW606, SPW801, or SPW909 spanner wrench. Their unmounted counterparts are most easily held using one of our cylindrical lens mounts, which are specifically designed to hold square or rectangular optics.

Please note that the Zemax file provided below is not the common sequential (SC) raytracing file which we typically provide, but the non-sequential (NSC) raytracing file. Be aware that the standard version of Zemax OpticStudio® does not support the NSC mode.

AR Coating Options
While our uncoated PMMA microlens arrays offer excellent performance, improved transmission can be gained by choosing a lens with an antireflective coating on both sides to reduce the surface reflections. Our broadband antireflection (BBAR) coatings provide <0.8% average reflectance over one of the following wavelength ranges: 420 - 700 nm or 650 - 1050 nm.

For microlens arrays that are ideal for use in custom-built Shack-Hartmann wavefront sensors, please visit the Fused Silica Microlens Arrays page.

Fly's Eye Homogenizer Setup
Click to Enlarge
This fly's eye homogenizer can be used to transform a round Gaussian collimated beam into a rectangular homogeneous spot.
Diagram of Beam splitting with Faraday RotatorClick to Enlarge
A Simplified Diagram of the Setup.

Fly's Eye Homogenizer

There are multiple ways to homogenize the output of a light source. Microlens arrays (MLAs) used in a fly's eye homogenizer configuration transforms a round collimated beam with a Gaussian profile into a rectangular homogeneous spot. The size of the rectangular spot is defined by the size and pitch of the microlenses.

The application photo to the right shows the configuration mounted in a 30 mm cage system. The light source is a PL201 compact laser module fixed in an AD11F SM1-threaded adapter held in a CP33(/M) cage plate. Alternatively, a multimode fiber fed with a fiber-coupled LED can be connected to a collimator such as the F240SMA-A. Doing this will get rid of the speckles produced by the laser. The light passes through the first of two MLAs held in CP6T cage plates. These cage plates are thin enough to hold the mounted MLAs. The lensed side of the MLAs should be facing the source. It is key to accurately align the MLAs to each other; there will be artifacts on the screen otherwise. The light then passes through an LB1471 N-BK7 bi-convex lens to produce a rectangular 9 mm x 12 mm spot on an EDU-VS2(/M) screen, as seen in the photo to the right.

Please note that this is a spot and not a beam, meaning the spot is sharply defined only at a certain distance from the focusing lens. The actual size of the spot can be adjusted by changing the distance between the two MLAs. Decreasing the distance will increase the size of the rectangle and increasing the distance will make the spot smaller. Different uncoated bi-convex lenses, such as the LB1092 Ø1/2" lens with 15.0 mm focal length or LB1014 Ø1/2" lens with 25.0 mm focal length, can also be used to produce a smaller rectangular spot. A setup like this can be mounted directly on a post. Post holders with clamping forks secure the setup to a breadboard such as the MB3045(/M). A simplified diagram of the setup is shown on the bottom right.

Item #QtyDescription
PL2011Compact Laser Module with USB Connector, 520 nm, 0.9 mW (Typ.)
AD11F1SM1-Threaded Adapter for Ø11 mm, ≥0.35" (8.9 mm) Long Cylindrical Components
CP332SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
MLA1M2Ø1" Mounted PMMA Microlens Array, Uncoated, EFL = 4.7 mm
CP6T2SM1-Threaded 30 mm Cage Plate, 6.0 mm Thick
LB14711N-BK7 Bi-Convex Lens, Ø1", f = 50.0 mm, Uncoated
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
TR21Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
PH2E1Ø1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=2.19"
CF125C1Clamping Fork, 1.24" Counterbored Slot, 1/4"-20 Captive Screw
View Metric Product List
Item #QtyDescription
PL2011Compact Laser Module with USB Connector, 520 nm, 0.9 mW (Typ.)
AD11F1SM1-Threaded Adapter for Ø11 mm, ≥0.35" (8.9 mm) Long Cylindrical Components
CP33/M2SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
MLA1M2Ø1" Mounted PMMA Microlens Array, Uncoated, EFL = 4.7 mm
CP6T2SM1-Threaded 30 mm Cage Plate, 6.0 mm Thick
LB14711N-BK7 Bi-Convex Lens, Ø1", f = 50.0 mm, Uncoated
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
TR50/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 50 mm
PH50E/M1Ø12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=54.7 mm
CF125C/M1Clamping Fork, 31.5 mm Counterbored Slot, M6 x 1.0 Captive Screw

Posted Comments:
ke wang  (posted 2021-09-29 12:13:30.187)
1. I want to know the damage threshold of MLA11 PMMA microlens array my laser: DPSS 532nm laser power:300mw working mode:CW beam diameter:6-9mm
soswald  (posted 2021-10-14 06:14:52.0)
Dear Ke Wang, thank you for your feedback. We have not formally tested the damage threshold for MLA11. I have reached out to you to discuss your application in more detail and provide further assistance.

Unmounted PMMA Microlens Arrays

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
MLA1 Support Documentation
MLA1NEW!10.0 mm x 9.8 mm PMMA Microlens Array, Uncoated, EFL = 4.7 mm
$30.00
5-8 Days
MLA11 Support Documentation
MLA11NEW!10.0 mm x 9.8 mm PMMA Microlens Array, AR Coated: 420 - 700 nm, EFL = 4.7 mm
$75.00
Today
MLA12 Support Documentation
MLA12NEW!10.0 mm x 9.8 mm PMMA Microlens Array, AR Coated: 650 - 1050 nm, EFL = 4.7 mm
$75.00
Today

Ø1" (Ø25.4 mm) Mounted PMMA Microlens Arrays

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
MLA1M Support Documentation
MLA1MNEW!Ø1" Mounted PMMA Microlens Array, Uncoated, EFL = 4.7 mm
$90.00
5-8 Days
MLA1M1 Support Documentation
MLA1M1NEW!Ø1" Mounted PMMA Microlens Array, AR Coated: 420 - 700 nm, EFL = 4.7 mm
$140.00
5-8 Days
MLA1M2 Support Documentation
MLA1M2NEW!Ø1" Mounted PMMA Microlens Array, AR Coated: 650 - 1050 nm, EFL = 4.7 mm
$140.00
5-8 Days