Method for adaptive correction of the phase non-uniformity of a

Details Method for adaptive correction of the phase non-uniformity of a Method for adaptive correction of the phase non-uniformity of a

1986-12-24

1991-09-17

Hellner, Mark

Optical: systems and elements

Holographic system or element

Having optical element between object and recording medium

2502019, 359241, 359276, G02F 124

Patent

active

050489356

ABSTRACT:
Apparatus for compensating for inherent distortions in a modified liquid crystal light valve used in an integrated wavefront sensing and wavefront control system for laser optics. A main wavefront sensing and control system utilizes a liquid crystal light valve selected for response speed but having inherent surface non-linearities. A beam from an auxiliary laser is intermittently applied, while the main laser is blocked, to both the fast response LCLV of the main system and to a slower response LCLV of an associated correction system. The second LCLV system corrects for the non-linearities in the surface of the first LCLV and then maintains the stored correction signal for a decay interval which corresponds to several response times of the main LCLV, thus permitting the main LCLV system to perform fast correction of atmospheric aberrations in the laser beam wavefront unaffected by inherent surface non-linearities.

REFERENCES:
patent: 3967899 (1976-07-01), O'Meara
patent: 4013345 (1977-03-01), Roach
patent: 4019807 (1977-04-01), Boswell et al.
patent: 4249140 (1981-02-01), Frieberg
patent: 4441791 (1984-04-01), Hornbeck
patent: 4619501 (1986-10-01), Armitage
Warde et al., "High Resolution Adaptive Phase Compensation for Low-Visibility Optical Communication", IEEE, 1980.
O'Meara, "Applications of Nonlinear Phase Conjugation in Compensated Active Imaging", Optical Engineering, vol. 21, No. 2, 1982.
Deuling, "Deformation of Nematic Liquid Crystals in an Electric Field", Molecular Crystals and Liquid Crystals, 1972.
Fisher et al., "Technique for Real-Time High-Resolution Adaptive Phase Compensation", Opt. Soc. Am., 1983.

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