Boundary Layer Control For Large Optics

David C. Johnson

doi:10.1117/12.951358

11 July 1989 Boundary Layer Control For Large Optics

David C. Johnson

Proceedings Volume 1047, Mirrors and Windows for High Power/High Energy Laser Systems; (1989) https://doi.org/10.1117/12.951358
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

Citation Download Citation

David C. Johnson "Boundary Layer Control For Large Optics", Proc. SPIE 1047, Mirrors and Windows for High Power/High Energy Laser Systems, (11 July 1989); https://doi.org/10.1117/12.951358

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