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Proceedings Paper

Adaptive active imaging system based on radiation focusing for extended targets
Author(s): Vladimir I. Polejaev; Mikhail A. Vorontsov
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Paper Abstract

An adaptive system for active imaging and radiation focusing on extended rough-surfaced objects in the presence of phase distortions was experimentally demonstrated. This technique is based on the use of two laser beams having different wavelengths, here a He-Ne and Argon laser. The Argon laser beam was used for adaptive radiation focusing on the rough target surface. The second laser beam served for target active imaging. The imaging system included the same wavefront correctors used for the radiation focusing system. For adaptive control of the wavefront correctors, a gradient technique based on a radiation focusing quality criterion optimization was applied. Statistical properties of the speckle field scattered by the target surface were used as the radiation focusing quality metric. To measure this criterion a single photodiode with a simple signal analysis method was employed. Adaptive correction was implemented with a nine electrode bimorph mirror and a liquid crystal spatial phase modulator having 127 individually addressed hexagonal liquid crystal cells.

Paper Details

Date Published: 17 October 1997
PDF: 5 pages
Proc. SPIE 3126, Adaptive Optics and Applications, (17 October 1997); doi: 10.1117/12.290150
Show Author Affiliations
Vladimir I. Polejaev, Army Research Lab. (United States)
Mikhail A. Vorontsov, Army Research Lab. and New Mexico State Univ. (United States)

Published in SPIE Proceedings Vol. 3126:
Adaptive Optics and Applications
Robert K. Tyson; Robert Q. Fugate, Editor(s)

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