105μm芯径GI多模光纤中受激布里渊散射及受激布里渊放大模式特性研究.doc

文档介绍：
105μm芯径 GI多模光纤中受激布里渊散射
及受激布里渊放大模式特性研究#
张建晖,朱成禹**
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(哈尔滨工业大学可调谐激光技术国家级重点实验室)
摘要:在多模光纤中发生的受激布里渊散射及受激布里渊放大,可以实现一种将多模光斑净
化为基模光斑的模式净化效应,对改善大芯径高功率光纤激光器的输出光束质量问题有极大
帮助。本文介绍了在脉冲光源条件下通过受激布里渊散射及受激布里渊放大实现模式净化的
条件,展示了实现模式净化的实验平台及实验结果,在 105μm 芯径多模光纤中将杂散的高
阶模净化为 M2≈ 的基模,并对模式净化的物理图像给出了合理的解释。
关键词:物理电子学;SBS;GI 多模光纤;模式净化
中图分类号:O437
Study on Stimulated Brillouin Scattering and Stimulated
Brillouin amplification in 105 μm core diameter GI fiber.
Zhang Jianhui, Zhu Chengyu
(National Key Laboratory of Science and Technology on Tunable laser, Harbin Institute of
Technology)
Abstract: timulated Brillouin Scattering and Stimulated Brillouin amplification in multimode fiber
lead to the event of beam cleanup, which can convert a multimode beam into a single-mode beam.
The effect of beam cleanup can be used to improve the beam quality of the multimode fiber laser
and amplifier with large core diameter and high peak power. This paper introduced the conditions
to achieve beam cleanup by Stimulated Brillouin Scattering and Stimulated Brillouin
amplification using pulsed laser. Experimental setup and results in 105μm core diameter fiber are
showed, and the physical image is presented. A single-mode beam with M2= is contained.
Key words: Physical Electronics; SBS; GI multimode fiber; beam cleanup
0 引言
目前,kW 级连续光纤激光器已商业化;MW 级高峰值功率、大能量的光纤脉冲激光正
成为研究热点。然