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

Armen Sevian; Oleksiy Andrusyak; Igor Ciapurin; George Venus; Leonid Glebov

doi:10.1117/12.666024

12 May 2006 Spectral beam combining with volume Bragg gratings: cross-talk analysis and optimization schemes

Armen Sevian, Oleksiy Andrusyak, Igor Ciapurin, George Venus, Leonid Glebov

Proceedings Volume 6216, Laser Source and System Technology for Defense and Security II; 62160V (2006) https://doi.org/10.1117/12.666024
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

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.

Citation Download Citation

Armen Sevian, Oleksiy Andrusyak, Igor Ciapurin, George Venus, and Leonid Glebov "Spectral beam combining with volume Bragg gratings: cross-talk analysis and optimization schemes", Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 62160V (12 May 2006); https://doi.org/10.1117/12.666024

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