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Proceedings Paper

Boundary Layer Control For Large Optics
Author(s): David C. Johnson
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Paper Abstract

The uncontrolled thermal boundary layers associated with optical surfaces exposed to high power laser radiation can significantly degrade optical performance. The thermal boundary layers associated with the centrally obscured primary mirror or exit window of an on axis beam expander can be controlled by placing a radial array of gas jets in the central obscuration. The resulting momentum and thermal boundary layers were experimentally investigated, and the results are used to predict both time-averaged and time-varying optical path differences through the boundary layer of a 3.5 m diameter heated optical surface.

Paper Details

Date Published: 11 July 1989
PDF: 10 pages
Proc. SPIE 1047, Mirrors and Windows for High Power/High Energy Laser Systems, (11 July 1989); doi: 10.1117/12.951358
Show Author Affiliations
David C. Johnson, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1047:
Mirrors and Windows for High Power/High Energy Laser Systems
Claude A. Klein, Editor(s)

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