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Proceedings Paper

High-power visible laser effect on a Boston Micromachines' MEMS deformable mirror
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Paper Abstract

Continuous-facesheet and segmented Boston Micromachines Corporations' (BMC) Micro-Electrical Mechanical Systems (MEMS) Deformable Mirrors (DM) have been tested for their response to high-power visible-wavelength laser light. The deformable mirrors, coated with either protected silver or bare aluminum, were subjected to a maximum of 2 Watt laser-light at a wavelength of 532 nanometers. The laser light was incident on a ~ 3.5×3.5 cm area for time periods from minutes to 7 continuous hours. Spot heating from the laser-light is measured to induce a local bulge in the surface of each DM. For the aluminum-coated continuous facesheet DM, the induced spot heating changes the surface figure by 16 nm rms. The silver-coated continuous-facesheet and segmented (spatial light modulator) DMs experience a 6 and 8 nm surface rms change in surface quality with the laser at 2 Watts. For spatial frequencies less than the actuator spacing (300 mm), the laser induced surface bulge is shown to be removable, as the DMs continued to be fully functional during and after their exposure. Over the full 10 mm aperture one could expect the same results with a 15 Watt laser guide star (LGS). These results are very promising for use of the MEMS DM to pre-correct the outgoing laser light in the Laboratory for Adaptive Optics' (LAO) laser uplink application.

Paper Details

Date Published: 29 July 2010
PDF: 9 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77365O (29 July 2010); doi: 10.1117/12.856635
Show Author Affiliations
Andrew Norton, Univ. of California Observatories/Lick Observatory, Univ. of California, Santa Cruz (United States)
Donald Gavel, Univ. of California Observatories/Lick Observatory, Univ. of California, Santa Cruz (United States)
Daren Dillon, Univ. of California Observatories/Lick Observatory, Univ. of California, Santa Cruz (United States)
Steven Cornelissen, Boston Micromachines Corp. (United States)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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