Title

Spectral Beam Combining With Volume Bragg Gratings: Cross-Talk Analysis And Optimization Schemes

Keywords

Cross-talk minimization; Spectral beam combining; Spectral density; Volume Bragg gratings

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.

Publication Date

8-23-2006

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

6216

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.666024

Socpus ID

33747334839 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33747334839

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