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Proceedings Paper

250-W LD bar pump source with 10-GHz spectral width for rubidium vapor medium
Author(s): A. Podvyaznyy; G. Venus; V. Smirnov; D. Hostutler; L. Glebov
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Paper Abstract

The diode pumped alkali vapor lasers are significantly beneficent from the developing of a new generation of highpower laser diode sources. The latest achievements in the technology of photo-thermo-refractive volume Bragg gratings opened new opportunities for the design and fabrication of compact external cavity laser diodes and bars with reflecting volume Bragg gratings as output couplers. A new developed fiber coupled 250W source consists from 7 channels of independently stabilized commercially available LD bars with standard AR-coatings at output facets. Using a specially designed reflecting volume Bragg grating, we demonstrated spectral narrowing of a single LD bar spectrum by over two orders of magnitude down to 16-18 pm at 780 nm wavelength. The volume Bragg laser bar output power exceeded 88% of that for the free-running laser bar. The spectral position of each LD precise tuning is made by means of a special method of temperature stabilization of an output volume Bragg coupler. Overall spectral width for whole system was less than 20 pm (<10 GHz). Optical pumping of a rubidium gain medium requires fine-tuning of pumping laser emission to precisely overlap with narrow Rb absorption band. The emission spectrum of the volume Bragg LD bar pumping source was tuned over a 300 pm spectral range without deteriorating the line-width. The absorption of the pump light by Rb atoms was measured in a rubidium vapor mixed with low pressure C2H6 buffer gas. More than 91% power of the pump source was absorbed by the low-pressure Rb vapor.

Paper Details

Date Published: 4 May 2010
PDF: 7 pages
Proc. SPIE 7686, Laser Technology for Defense and Security VI, 76860P (4 May 2010); doi: 10.1117/12.851382
Show Author Affiliations
A. Podvyaznyy, OptiGrate Corp. (United States)
G. Venus, CREOL/The College of Optics and Photonics, Univ. of Central Florida (United States)
V. Smirnov, OptiGrate Corp. (United States)
D. Hostutler, Air Force Research Lab. (United States)
L. Glebov, CREOL/The College of Optics and Photonics, Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 7686:
Laser Technology for Defense and Security VI
Mark Dubinskii; Stephen G. Post, Editor(s)

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