Microlens Arrays

OVERVIEW

Item #	MLA150-5C(-M)	MLA150-7AR(-M)	MLA300-14AR(-M)
Substrate Material	Fused Silica (Quartz)
Nominal Focal Length	5.2 mm	6.7 mm	18.6 mm
Wavelength Range	300 - 1100 nm	400 - 900 nm	400 - 900 nm
Lenslet Grid Type	Square Grid
Lenslet Pitch	150 µm		300 µm
Lens Shape	Round, Plano-Convex Spherical		Square, Plano-Convex Parabolic
Fill Factor (Approximate)^a	74.5%		100%
Lens Diameter	146 µm		300 µm
Chrome Apertures	Yes, around Microlenses	No
Reflectivity	<25%^b	<1%	<1%
Array Size	10 mm x 10 mm x 1.2 mm
Mount Window Aperture (-M Versions Only)	9 mm x 9 mm

The Fill Factor is a measure of the fraction of incident light reaching the detector. For the MLA150-5C and MLA150-7AR, the fill factor is less than 100% because the round lenses are arranged on a square grid.
Includes the light reflected off of the chrome mask.

Features

10 mm x 10 mm High-Quality Microlens Array
Available Unmounted or in a Ø1" Mount
Two Wavelength Ranges Available:
- 400 - 900 nm with an AR Coating
- 300 - 1100 nm with a Chrome Mask
Fused Silica Substrate
Square Grid Arrangement of Microlenses
Arrays with 150 µm or 300 µm Lenset Pitches Available
Near Diffraction-Limited Spot Size
High Spot-to-Background Contrast
Use for Custom-Built Shack-Hartmann Wavefront Sensors

These Fused Silica Microlens Arrays are available mounted or unmounted (click here to see an enlarged photo). Fused silica offers excellent transmission characteristics from the UV to the IR. The microlenses have a plano-convex shape and are arranged in a square grid with a lens pitch of 150 µm or 300 µm. The arrays with a pitch of 150 µm have round lenslets. The arrays with a pitch of 300 µm have square lensets, allowing for a fill factor of 100%.

The MLA150-5C lens array and its mounted counterpart have a chrome mask that blocks light from being transmitted through the spaces between microlenses, thereby increasing the constrast. The unmounted MLA150-7AR and MLA300-14AR lens arrays and their mounted versions have a broadband AR coating on both sides to reduce the surface reflections in the 400 - 900 nm spectral region to below 1%.

These lenses are formed using photolithographic techniques based on semiconductor processing technology, which allows for excellent uniformity in the shape and position of each microlens. Unlike some microlens arrays produced from molded epoxy, this method produces microlens arrays where the spot size of each microlens is nearly diffraction limited.

For the mounted versions, the microlens is glued into a Ø1", 3.5 mm thick mount plate that is compatible with all standard Ø1" optics mounts. The aperture of the lens window is 9 mm x 9 mm. Their unmounted couterparts are most easily held using one of our cylindrical lens mounts, which are specifically designed to hold square or rectangular optics.

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APPLICATION

A microlens array used in conjunction with a CCD array can constitute the core of a Shack-Hartmann wavefront sensor. As seen from the figure below, a planar wavefront that is transmitted through a microlens array and imaged on a CCD sensor will form a regular pattern of bright spots. If, however, the wavefront is distorted, the light imaged on the CCD sensor will consist of some regularly spaced spots mixed with displaced spots and missing spots. This information can be used to calculate the shape of the wavefront that was incident on the microlens array. Shack- Hartmann type wavefront sensors can be used to characterize the performance of optical systems. In addition, they are increasingly used in applications where real-time monitoring of the wavefront is used to control an adaptive optic with the intent of removing the wavefront distortion before creating an image.

Hide 10 mm x 10 mm Unmounted Microlens Arrays

10 mm x 10 mm Unmounted Microlens Arrays

Fused Silica Substrate
AR Coating (MLA150-7AR and MLA300-14AR) or Chrome Mask (MLA150-5C)
Array Size: 10 mm x 10 mm x 1.2 mm
Square Grid Arrangement of Microlenses
Use in Custom-Built Shack-Hartmann Wavefront Sensors*

*Please Note: Pre-assembled Shack-Hartman wavefront sensors will need to be re-calibrated if these microlenses are used in place of the microlenses already built into the system. To order additional microlens arrays for Thorlabs' Shack-Hartmann Wavefront Sensors, please contact Tech Support

Part Number	Description	Price	Availability
MLA150-5C	10 mm x 10 mm Unmounted Lens Array, 300-1100 nm, Chrome Mask, Pitch=150 µm, f=5.2 mm	$370.00	Today
MLA150-7AR	10 mm x 10 mm Unmounted Lens Array, ARC: 400-900 nm, Pitch=150 µm, f=6.7 mm	$370.00	Today
MLA300-14AR	10 mm x 10 mm Unmounted Lens Array, ARC: 400-900 nm, Pitch=300 µm, f=18.6 mm	$370.00	Today

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

Ø1" (Ø25.4 mm) Mounted Microlens Arrays

Compatible with Standard Ø1" Optic Mounts
Lens Window Aperture: 9 mm x 9 mm
Array Size: 10 mm x 10 mm x 1.2 mm
Fused Silica Substrate
AR Coating (MLA150-7AR-M and MLA300-14AR-M) or Chrome Mask (MLA150-5C-M)
Square Grid Arrangement of Microlenses
Use in Custom-Built Shack-Hartmann Wavefront Sensors*

Part Number	Description	Price	Availability
MLA150-5C-M	NEW! Ø1" Mounted Lens Array, 300 - 1100 nm, Chrome Mask, Pitch=150 µm, f=5.2 mm	$430.00	Today
MLA150-7AR-M	NEW! Ø1" Mounted Lens Array, 400 - 900 nm AR Coating, Pitch=150 µm, f=6.7 mm	$430.00	Today
MLA300-14AR-M	NEW! Ø1" Mounted Lens Array, 400 - 900 nm AR Coating, Pitch=300 µm, f=18.6 mm	$430.00	3-5 Days