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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 29 — Oct. 10, 2008
  • pp: 5325–5329

Thermomechanical characterization of a membrane deformable mirror

Kathleen A. Morse, Stuart L. McHugh, and Jeff Fixler  »View Author Affiliations


Applied Optics, Vol. 47, Issue 29, pp. 5325-5329 (2008)
http://dx.doi.org/10.1364/AO.47.005325


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Abstract

A membrane deformable mirror has been investigated for its potential use in high-energy laser systems. Experiments were performed in which the deformable mirror was heated with a 1 kW incandescent lamp and the thermal profile, the wavefront aberrations, and the mechanical displacement of the membrane were measured. A finite element model was also developed. The wavefront characterization experiments showed that the wavefront degraded with heating. Above a temperature of 35 ° C , the wavefront characterization experiments indicated a dramatic increase in the high-order wavefront modes before the optical beam became immeasurable in the sensors. The mechanical displacement data of the membrane mirror showed that during heating, the membrane initially deflected towards the heat source and then deflected away from the heat source. Finite element analysis (FEA) predicted a similar displacement behavior as shown by the mechanical displacement data but over a shorter time scale and a larger magnitude. The mechanical displacement data also showed that the magnitude of membrane displacement increased with the experiments that involved higher temperatures. Above a temperature of 35 ° C , the displacement data showed that random deflections as a function of time developed and that the magnitude of these deflections increased with increased temperature. We concluded that convection, not captured in the FEA, likely played a dominant role in mirror deformation at temperatures above 35 ° C .

© 2008 Optical Society of America

OCIS Codes
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Optical Devices

History
Original Manuscript: May 28, 2008
Revised Manuscript: August 15, 2008
Manuscript Accepted: September 2, 2008
Published: October 7, 2008

Citation
Kathleen A. Morse, Stuart L. McHugh, and Jeff Fixler, "Thermomechanical characterization of a membrane deformable mirror," Appl. Opt. 47, 5325-5329 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-29-5325

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