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High efficient beam cleanup based on stimulated Brillouin scattering with a large core fiber

Published online by Cambridge University Press:  15 September 2014

Qilin Gao ,
Zhiwei Lu ,
Chengyu Zhu  and
Jianhui Zhang
Qilin Gao
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, China
Zhiwei Lu*
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, China
Chengyu Zhu
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, China
Jianhui Zhang
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, China
*
Address correspondence and reprint requests to: Z. W. Lu, National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China. E-mail: zw_lu@sohu.com
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Abstract

A novel approach of beam cleanup based on stimulated Brillouin scattering with a large core fiber is proposed to improve the laser beam quality. The fusion splice scheme from a single-mode fiber to a very large core fiber (105 µm) is first employed in stimulated Brillouin scattering to steadily excite the fundamental mode of the Stokes beam. As a result, the output beam achieves a measured M2 value of around 1.3 meanwhile the pump conversion efficiency is up to 90%, which is the best in the reports of stimulated Brillouin scattering cleanup to our knowledge.

Keywords

Beam cleanupHigh conversion efficiencyLarge core fiberStimulated Brillouin scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 4 , December 2014 , pp. 517 - 521
Copyright
Copyright © Cambridge University Press 2014 

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