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Proceedings Paper

Beam path conditioning for high energy laser beam directors
Author(s): David C. Johnson; Glenda S. Holderbaum
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Paper Abstract

The uncontrolled thermal currents present in a beam expander can significantly degrade optical performance. Incident laser radiation on mirrors and their supporting structures insures that temperature differences will be present. These temperature differences within the beam path can induce significant optical distortions. Optical performance can be improved with active conditioning of the beam path. This report describes several aspects of active beam path conditioning: boundary layer control on mirrors, thermal conditioning of beam expander cavities and coude paths, and thermal control of vacuum and exit window configurations. Design concepts for each of these components are discussed. Beam path conditioning systems that combine these components are presented and recommendations given. Finally, a summary of current capabilities in beam path conditioning systems is made with recommendations for future work.

Paper Details

Date Published: 1 September 1990
PDF: 21 pages
Proc. SPIE 1312, Propagation Engineering: Third in a Series, (1 September 1990); doi: 10.1117/12.21900
Show Author Affiliations
David C. Johnson, Lincoln Lab./MIT (United States)
Glenda S. Holderbaum, Lincoln Lab./MIT (United States)

Published in SPIE Proceedings Vol. 1312:
Propagation Engineering: Third in a Series
Luc R. Bissonnette; Walter B. Miller, Editor(s)

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