1 September 1990 Beam-path conditioning for high-energy laser beam directors
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David C. Johnson, Glenda S. Holderbaum, "Beam-path conditioning for high-energy laser beam directors", Proc. SPIE 1312, Propagation Engineering: Third in a Series, (1 September 1990); doi: 10.1117/12.21900; https://doi.org/10.1117/12.21900

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