1 November 1992 Incidence angle reducer for holgraphic optical elements used to improve laser detection systems
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Optical Engineering, 31(11), (1992). doi:10.1117/12.59990
Abstract
How special reflective devices reduce the angle of incidence of a laser beam irradiating a surface with the ability to decrease the incidence angle over a wide range of angles is described. To optimize the diffraction efficiency of a focusing holographic optical element (HOE), spread of the angle of incidence of an incoming laser beam about a preferred angle should be small. There is a constraint with thick HOEs in which a Bragg effect condition must be satisfied to achieve high diffraction efficiency. Angle reduction and applications of military interest are discussed. Ways to couple a reflection angle reducer component and an HOE to a photographic or TV camera are suggested.
Kenneth G. Leib, Benjamin J. Pernick, "Incidence angle reducer for holgraphic optical elements used to improve laser detection systems," Optical Engineering 31(11), (1 November 1992). https://doi.org/10.1117/12.59990
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