THORLABS WFS20-14AR, Руководство по эксплуатации

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8 Appendix
107
8.1.4 MLA Microlens Arrays
The Wavefront Sensor uses high-quality microlens arrays which are best suited for Shack-Hart-
mann Wavefront Sensor applications. All lenslets are made from fused silica for excellent trans-
mission characteristics from the deep UV to IR and have a plano-convex shape that allows
nearly refraction limited spots.
The 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.
The Wavefront Sensor models WFSxx-5C, WFSxx-7AR and WFSxx-14AR utilize the mounted
microlens arrays MLA150-5C, MLA150-7AR and MLA300-14AR, respectively.
The MLA150-5C has a chrome mask grid that blocks light from being transmitted unless it
passes through a microlens, which increases the image contrast. The MLA150-7AR and
MLA150-14AR have a broadband AR coating that reduces surface reflections in the 400-900
nm spectral region to below 1%.
Microlens Array MLA150-5C (without mounting)
Geometric Parameters of the MLA Series (without mounting)
Parameter MLA150-5C MLA150-7AR MLA300-14AR
Array Size (h=w)
WFS20 10.0 mm
Array Size (h=w)
WFS30, WFS40
12.0 mm x 12.0 mm
t 1.2 mm
p 150 µm 300 µm
Lens Size
1)
Æ
140
m
m
(Cr Mask Win-
dow)
Æ
146
m
m
(Lens Diameter)
295
m
m x 295
m
m
(Square)
r
1)
2.54 mm 6.5 mm
f
2)
5.6 mm 14.2 mm
f
eff
3)
4.1 mm 5.2 mm 14.6 mm
1)
Info value, not specified
2)
Nominal value, ±3% tolerance, Note: when built into a WFS, the effective focal
length may differ!
3)
Effective (optimal) focal length when built into a WFS