Abstract

A comprehensive study of the interactive effects of multidither adaptive optics (COAT) systems with the spurious signals induced by speckle modulations is presented. An analysis based on a statistical model of a COAT system is developed in order to predict convergence levels in the presence of such modulations. A computer simulation study of these effects is also presented. Good agreement is found between the data gathered in both of these studies. In order to further corroborate these results, experimental data is then presented. These data were gathered using a laboratory model of a COAT system interacting with a real target that produced speckle modulations.

© 1977 Optical Society of America

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  1. James E. Pearson, S. A. Kokorowski, and M. E. Pedinoff, "Effects of speckle in adaptive optical systems, " J. Opt. Soc. Am. 66, 1261 (1976).
  2. The acronym "COAT stands for coherent optical adaptive techniques and is applied generally to self-adaptive phased arrays deriving active phase correction information from target return radiation.
  3. 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 (1974).
  4. 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 (1976).
  5. James E. Pearson, "Atmospheric Turbulence Compensation Using Coherent Optical Adaptive Techniques," Appl. Opt. 15, 622 (1976).
  6. J. W. Goodman, "Some fundamental properties of speckle," J. Opt. Soc. Am. 66, 1145 (1976).
  7. This computation as described is very cumbersome, involving the solution of transcendental equations. Rather than calculating αa from Eq. (28), what one has to do is compute and plot 〈I2D〉 and 〈I2M〉 using Eqs. (20) and (21). Then for a given value of 〈I2D〉 and 〈I2M〉, α can be read from the plot.
  8. J. C. Erdmann and R. I. Gellert, "Speckle field of curved, rotating surfaces of Gaussian roughness illuminated by a laser spot," J. Opt. Soc. Am. 66, 1194 (1976).
  9. Convergence time is defined as the time required for the intensity on a target glint to increase from 10% to 90% of maximum.

1976

1974

Bridges, W. B.

Brown, Jr., W. P.

Brunner, P. T.

Erdmann, J. C.

Gellert, R. I.

Goodman, J. W.

Hansen, S.

Kokorowski, S. A.

Lazzara, S. P.

Nussmeier, T. A.

O’Meara, T. R.

Pearson, J. E.

Pearson, James E.

Pedinoff, M. E.

Sanguinet, J. A.

Appl. Opt.

J. Opt. Soc. Am.

Other

Convergence time is defined as the time required for the intensity on a target glint to increase from 10% to 90% of maximum.

The acronym "COAT stands for coherent optical adaptive techniques and is applied generally to self-adaptive phased arrays deriving active phase correction information from target return radiation.

This computation as described is very cumbersome, involving the solution of transcendental equations. Rather than calculating αa from Eq. (28), what one has to do is compute and plot 〈I2D〉 and 〈I2M〉 using Eqs. (20) and (21). Then for a given value of 〈I2D〉 and 〈I2M〉, α can be read from the plot.

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