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Proceedings Paper

Volume Bragg semiconductor lasers with near diffraction limited divergence
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Paper Abstract

The problem of high-brightness, narrow line semiconductor lasers sources is important for different kinds of applications. The proposed solution of the problem is the use of an external cavity with volume Bragg grating for effective angular and spectral selection. High-efficient volume Bragg gratings provide complete selection directly in space of wave vectors and serve as a diaphragm in angular space. The condition of effective selection is the provision of a substantial difference in losses for a selected mode by matching angular selectivity of a Bragg grating with divergence of the selected mode. It was proposed off-axis construction of an external cavity with a transmitting volume Bragg grating as an angular selective element and a reflecting volume Bragg grating as a spectral selective feedback. In such external cavity broad area laser diodes have shown stable near-diffraction limited generation in the wide range of pumping current. For LD with 0.5% AR-coated mirror and 150 μm stripe it was achieved 1.7 W output power with divergence of 0.62° at current exceeding six thresholds. Total LD slope efficiency in the considered external cavity is less then slope efficiency of free running diodes by 3-5% only. Spectral width of such locked LD emission was narrowed down to 250 pm in the whole range of pumping current.

Paper Details

Date Published: 12 May 2006
PDF: 7 pages
Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 621602 (12 May 2006); doi: 10.1117/12.666193
Show Author Affiliations
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)
Vasile Rotar, College of Optics and Photonics, Univ. of Central Florida (United States)
Vadim Smirnov, OptiGrate (United States)
Paul Crump, nLight Photonics (United States)
Jason Farmer, nLight Photonics (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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