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4 May 2010 250-W LD bar pump source with 10-GHz spectral width for rubidium vapor medium
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Podvyaznyy, G. Venus, V. Smirnov, D. Hostutler, and L. Glebov "250-W LD bar pump source with 10-GHz spectral width for rubidium vapor medium", Proc. SPIE 7686, Laser Technology for Defense and Security VI, 76860P (4 May 2010);

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