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Proceedings Article

Volume Bragg semiconductor lasers with near diffraction limited divergence

[+] Author Affiliations
George Venus, Leonid Glebov, Vasile Rotar

College of Optics and Photonics, Univ. of Central Florida

Vadim Smirnov

OptiGrate

Paul Crump, Jason Farmer

nLight Photonics

Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 621602 (May 12, 2006); doi:10.1117/12.666193
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From Conference Volume 6216

  • Laser Source and System Technology for Defense and Security II
  • Gary L. Wood; Mark A. Dubinskii
  • Orlando (Kissimmee), FL | April 17, 2006

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.

© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

George Venus ; Leonid Glebov ; Vasile Rotar ; Vadim Smirnov ; Paul Crump, et al.
"Volume Bragg semiconductor lasers with near diffraction limited divergence", Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 621602 (May 12, 2006); doi:10.1117/12.666193; http://dx.doi.org/10.1117/12.666193


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