Automatic speckle cancellation techniques for multidither adaptive optics

Abstract

Analytical and computer simulation results show that it is possible to restore speckle-degraded performance of multidither adaptive optics systems. Such systems are known to be vulnerable to interference caused by the motion of a speckle pattern across their receiver apertures. Analysis has shown that the primary effect of speckel is to amplitude-modulate the usual point-source intensity distribution reflected from a target glint. With large targets there is also an additive noise contribution from the intensity associated with reflections from the area surrounding the target glint. A method is described whereby the speckle interference is estimated and electronically canceled in order to restore the degraded adaptive performance.

© 1980 Optical Society of America

Analytical, experimental, and computer-simulation results on the interactive effects of speckle with multidither adaptive optics systems*

S. A. Kokorowski, M. E. Pedinoff, and J. E. Pearson
J. Opt. Soc. Am. 67(3) 333-345 (1977)

Effects of speckle in adaptive optical systems*

James E. Pearson, S. A. Kokorowski, and M. E. Pedinoff
J. Opt. Soc. Am. 66(11) 1261-1267 (1976)

The multidither principle in adaptive optics

T. R. O’Meara
J. Opt. Soc. Am. 67(3) 306-315 (1977)

Coherent optical adaptive techniques: design and performance of an 18-element visible multidither COAT system

J. E. Pearson, W. B. Bridges, S. Hansen, T. A. Nussmeier, and M. E. Pedinoff
Appl. Opt. 15(3) 611-621 (1976)

Estimation and control in multidither adaptive optics

Robert B. Asher and Robert F. Ogrodnik
J. Opt. Soc. Am. 67(3) 350-359 (1977)