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Proceedings Paper

Development Of A Compound Interlaced Grating For High Energy Laser Systems
Author(s): C. Chi; C. Smith; M. Ogan; C. O'Bryan
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Paper Abstract

In High Energy Laser (HEL) systems, there exist requirements for spectral beam splitting devices for purposes of beam control and diagnostics. This paper describes the development of one such aperture sharing component, called the Compound Interlaced (CI) diffraction grating. The CI grating is ruled such that a high frequency, visible to near IR wavelength grating is placed directly on top of a lower frequency, long wave IR grating. In a system configuration, the HEL beam is sampled with the long period ruling and directed toward a wavefront monitor or beam tilt sensor, while the specular reflection is sent through pointing optics to the target of interest. At the same time, shorter wavelength return energy from the target is sampled by the short period grating and is subsequently imaged by an appropriate sensor. Results of work completed to date show that indeed such a grating can be fabricated on a high power substrate and can yield enough efficiency for an operational environment. The paper addresses various design and fabrication issues including groove spacing and profile, blaze angles, apex angles, skew angles (of one ruling with respect to the other), sub-strate coatings and ruling techniques.

Paper Details

Date Published: 10 February 1981
PDF: 10 pages
Proc. SPIE 0240, Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I, (10 February 1981); doi: 10.1117/12.965668
Show Author Affiliations
C. Chi, Hughes Aircraft Company (United States)
C. Smith, Hughes Aircraft Company (United States)
M. Ogan, Air Force Weapons Laboratory (United States)
C. O'Bryan, Air Force Weapons Laboratory (United States)

Published in SPIE Proceedings Vol. 0240:
Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I
C. H. Chi; E. G. Loewen; C. L. O'Bryan III, Editor(s)

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