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Proceedings Paper

Experimental Verification Of The Slow Dither Concept For Thermal Blooming Compensation
Author(s): Bruce J. Pierce; James E. Harvey; Raymond C. Dymale; Julian S. Nichols
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Paper Abstract

A multidither adaptive optical technique using dither frequencies below that of the atmosphere's characteristic response has been proposed for thermal blooming compensation. When such low dither frequencies are used, the atmosphere, which is coupled to the high-energy laser (HEL) beam through the absorption processes that create blooming, is thermally driven at the dither frequency. The modulated thermal radiation returning from the hot spot (created at the target by the high-energy beam) is optimized by using a hill-climbing servo system, and through reciprocity the HEL target irradiance is correspondingly optimized. Computer analyses of the slow dither concept predict convergence to an optimum target irradiance even when strong thermal blooming conditions are present. We have established a laboratory facility for the evaluation of adaptive optical compensation. A low-speed wind tunnel containing a small concentration of Freon 12 is used to simulate a wide variety of realistic blooming scenarios. In this paper we report some results of the first experimental investigation of the slow dither concept.

Paper Details

Date Published: 19 December 1979
PDF: 10 pages
Proc. SPIE 0195, Atmospheric Effects on Radiative Transfer, (19 December 1979); doi: 10.1117/12.957949
Show Author Affiliations
Bruce J. Pierce, University of Dayton Research Institute (United States)
James E. Harvey, University of Dayton Research Institute (United States)
Raymond C. Dymale, University of Dayton Research Institute (United States)
Julian S. Nichols, Air Force Weapons Laboratory/LRO (United States)

Published in SPIE Proceedings Vol. 0195:
Atmospheric Effects on Radiative Transfer
Claus B. Ludwig, Editor(s)

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