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Proceedings Paper

Spectral beam combining with volume Bragg gratings: cross-talk analysis and optimization schemes
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Paper Abstract

Volume Bragg gratings (VBGs) have been recognized as critical elements in various types of beam-combining applications, such as, design of super-parallel holographic optical correlators, coherent power beam-combiners and couplers, and spectral beam combiners (SBC) in which the output beams from several distinct laser sources are combined into a single-aperture beam. The obvious advantage of VBG stems from extremely narrow spectral and/or angular selectivity compared, to any other surface grating. This feature of VBG enables combining of large number of laser beams within near-diffraction-limited divergence. The VBGs recorded in a photo-thermo-refractive (PTR) glass exhibit a long-term stability of all their parameters at total CW power at a multi-kilowatt level and have shown high-efficiency combining of high-power laser beams. In order to increase the spectral capacity of such a "beam-combiner", the overall loss resulting from absorption and cross-talk between channels should be minimized. This paper considers architecture-specific SBC scheme and addresses the cross-talk minimization problem based on optimal channel positioning. A mathematical model reveals the critical parameters for high efficiency spectral beam combining.

Paper Details

Date Published: 12 May 2006
PDF: 12 pages
Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 62160V (12 May 2006); doi: 10.1117/12.666024
Show Author Affiliations
Armen Sevian, College of Optics and Photonics, Univ. of Central Florida (United States)
Oleksiy Andrusyak, College of Optics and Photonics, Univ. of Central Florida (United States)
Igor Ciapurin, College of Optics and Photonics, Univ. of Central Florida (United States)
George Venus, College of Optics and Photonics, Univ. of Central Florida (United States)
Leonid Glebov, College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 6216:
Laser Source and System Technology for Defense and Security II
Gary L. Wood; Mark A. Dubinskii, Editor(s)

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