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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 67, Iss. 3 — Mar. 1, 1977
  • pp: 325–332

Experimental studies of a deformable-mirror adaptive optical system

J. E. Pearson and S. Hansen  »View Author Affiliations

JOSA, Vol. 67, Issue 3, pp. 325-332 (1977)

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The measured characteristics of two different deformable mirror designs are presented. Each mirror is uncooled and has 37 piezoelectric actuators. The mirrors have comparable frequency response usable to over 20 kHz, but possess quite different actuator influence functions. One exhibits an exp(-αr1.5) characteristic and the other has an exp(-ar2.5) characteristic. The latter mirror is used in an 18-channel multidither adaptive optical system to perform both phase dither and phase correction functions. The measured characteristics of this system’s performance include a 2 ms convergence time and effective turbulence compensation. Evidence is presented of "2Nπ" servo ambiguities, a behavior which reduces an adaptive system’s overall phase compensation performance. The performance of the deformable mirror adaptive system is compared to an equivalent segmented (piston) mirror system.

© 1977 Optical Society of America

J. E. Pearson and S. Hansen, "Experimental studies of a deformable-mirror adaptive optical system," J. Opt. Soc. Am. 67, 325-332 (1977)

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  1. T. R. O'Meara, "The multidither principle in adaptive optics," J. Opt. Soc. Am. 67, 306–315 (1977) (this issue).
  2. W. B. Bridges, P. T. Brunner, S. P. Lazzara, T. A. Nussmeier, T. R. O'Meara, J. A. Sanguinet, and W. P. Brown, Jr., "Coherent optical adaptive techniques," Appl. Opt. 13, 291–300 (1974).
  3. J. E. Pearson, W. B. Bridges, S. Hansen, T. A. Nussmeier, and M. E. Pedinoff, "Coherent optical adaptive techniques: Design and performance of an 18-element visible multidither COAT system," Appl. Opt. 15, 611–621 (1976).
  4. J. E. Pearson, "Atmospheric turbulence compensation using coherent optical adaptive techniques," Appl. Opt. 15, 622–631 (1976).
  5. T. R. O'Meara, "Theory of multidither adaptive optical systems operating with zonal control of deformable mirrors," J. Opt. Soc. Am. 67, 318–325 (1977) (preceding paper).
  6. R. A. Muller and A. J. Buffington, "Real-time phase correction of atmospherically degraded telescope images through image sharpening," J. Opt. Soc. Am. 64, 1200–1210 (1974).
  7. J. Hardy, J. Feinleib, and J. C. Wyant, "Real-time phase correction of optical imaging systems," Proceedings of OSA Topical Meeting on Optical Propagation Through Turbulence, paper ThB1, Boulder, Colo., July 1974.
  8. W. P. Brown, Jr., (unpublished).
  9. Ratio of peak focal-plane irradiance to the peak diffraction-limited irradiance.
  10. This requirement is not an absolute necessity; but it greatly simplifies the servo design.
  11. Each dither frequency is used in two control channels; one uses sinωt and one uses cosωt.
  12. J. Feinleib, S. G. Lipson, and P. F. Cone, "Monolithic piezoelectric mirror for wavefront correction," Appl. Phys. Lett. 25, 311–313 (1974).

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