Abstract

Micro-machined membrane deformable mirrors (MMDMs) are being evaluated for their suitability as wavefront correctors at cryogenic temperatures. Presented here are experimental results for the change in the initial mirror figure of 37-channel MMDMs from OKO Technologies upon cooling to T=78K. The changes in the influence functions are also explored. Of the sample of 3 mirrors tested, one was found to have sufficiently small initial static aberrations to be useful as a wavefront corrector at this temperature. The influence functions at T=78K were found to be similar in shape to both those at room temperature and theoretical predictions of the MMDMs surface shape. The magnitude of the surface deflection at T=78K was reduced by around 20% compared with room temperature values.

© Optical Society of America

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References

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  1. http://www.okotech.com/
  2. D. Dayton, S. Restaino, J. Gonglewski, J. Gallegos, S. McDermott, S. Browne, S. Rogers, M. Vaidyanathan, M. Shilko, "Laboratory and field demonstration of a low cost membrane mirror adaptive optics system," Optics Communications, 176, 339-345 (2000).
    [CrossRef]
  3. C. Paterson, I. Munro, J.C. Dainty, "A low cost adaptive optics system using a membrane mirror," Opt. Express, 6, 175-185 (2000), http://www.opticsexpress.org/oearchive/source/20597.htm
    [CrossRef] [PubMed]
  4. G. Vdovin, P.M. Sarro, S. Middelhoek, "Technology and applications of micromachined adaptive mirrors," Journal of Micromechanics and Microengineering, 9, R8- R19 (1999)
    [CrossRef]
  5. http://www.okotech.com/pricelist/index.html

Other

http://www.okotech.com/

D. Dayton, S. Restaino, J. Gonglewski, J. Gallegos, S. McDermott, S. Browne, S. Rogers, M. Vaidyanathan, M. Shilko, "Laboratory and field demonstration of a low cost membrane mirror adaptive optics system," Optics Communications, 176, 339-345 (2000).
[CrossRef]

C. Paterson, I. Munro, J.C. Dainty, "A low cost adaptive optics system using a membrane mirror," Opt. Express, 6, 175-185 (2000), http://www.opticsexpress.org/oearchive/source/20597.htm
[CrossRef] [PubMed]

G. Vdovin, P.M. Sarro, S. Middelhoek, "Technology and applications of micromachined adaptive mirrors," Journal of Micromechanics and Microengineering, 9, R8- R19 (1999)
[CrossRef]

http://www.okotech.com/pricelist/index.html

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Figures (12)

Fig. 1.
Fig. 1.

Micro-Machined Deformable Mirror

Fig. 2.
Fig. 2.

Demonstration of single-pin mirror mounting

Fig. 3.
Fig. 3.

Variation of Zygo-measured aberrations with temperature for MMDM A

Fig. 4.
Fig. 4.

Variation of Zygo-measured aberrations with temperature for MMDM B

Fig. 5.
Fig. 5.

Variation of Zygo-measured aberrations with temperature for MMDM C

Fig. 6.
Fig. 6.

Mirror A

Fig. 7.
Fig. 7.

Mirror B

Fig. 8.
Fig. 8.

Mirror C

Fig. 9.
Fig. 9.

Room temperature influence function phase maps

Fig. 10.
Fig. 10.

Cold influence function phase maps

Fig. 11.
Fig. 11.

Theoretical influence function phase maps

Fig. 12.
Fig. 12.

Cross sections through influence functions. Note that 12a is normalised for each actuator independently, while 12b normalised to central actuator for the warm data)

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