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Proceedings Paper

Spectral beam combining of fiber lasers with increased channel density
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Paper Abstract

Incoherent spectral beam combining (SBC) by means of volume Bragg gratings (VBGs) has been shown to be a simple and robust technique for generating high-power laser radiation. Combination of laser radiation from multiple sources into a single near-diffraction-limited beam results in energy brightness increase, while spectral brightness is preserved. High-efficiency VBG recording in photo-thermo-refractive (PTR) glass has been recently developed. While being photosensitive in the UV, PTR glass offers high transmittance in the near-IR and visible parts of spectrum. Moreover, this glass has excellent mechanical properties and refractive index independent of temperature. These features enable VBGs in PTR glass to withstand high-power laser radiation, making them ideal elements for high-power SBC. We present experimental results of successful 5-channel SBC with reflecting VBGs in PTR glass with small channel spacing (~0.43 nm around 1064 nm). Absolute system efficiency of 93.5% is demonstrated. Combined beam is shown to be near-diffraction-limited with M2=1.11. Behavior of narrow-band reflecting VBGs in high-power beams is studied. VBGs are shown to withstand 570 W CW radiation around 1064 nm with diffraction efficiency in excess of 92%. Pathway to near-diffraction-limited high-power laser systems via SBC with VBGs is shown. High-efficiency SBC system with 0.2 nm channel spacing is designed.

Paper Details

Date Published: 21 February 2007
PDF: 7 pages
Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 64531L (21 February 2007); doi: 10.1117/12.712602
Show Author Affiliations
Oleksiy Andrusyak, College of Optics and Photonics, Univ. of Central Florida (United States)
Igor Ciapurin, OptiGrate (United States)
Vadim Smirnov, OptiGrate (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. 6453:
Fiber Lasers IV: Technology, Systems, and Applications
Donald J. Harter; Andreas Tünnermann; Jes Broeng; Clifford Headley III, Editor(s)

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