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Proceedings Paper

Suppression of high order modes employing active self-imaging mode filter in large mode area strongly pumped fiber amplifier
Author(s): Xiang Zhao; Gang Bai; Ye Zheng; Xiaolong Chen; Yifeng Yang; Yunfeng Qi; Bing He; Jun Zhou
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Paper Abstract

To suppress high order modes and improve the beam quality, an active self-imaging mode filter based on multimode interference and self-imaging effect is proposed in large mode area (LMA) fiber amplifier. With this filter structure, transverse mode competition and individual transverse mode power distributions in strongly pumped fiber amplifiers are theoretically demonstrated. Employing this mode selection technique in 30/400 LMA strongly pumped fiber amplifier, the percentage of the fundamental mode rises from 27.8% (without filter) to 96.3%. By the modal power decomposition, the M2 parameter of beam quality decrease dramatically from 2.24 to 1.11 (0 relative phase) and from 3.01 to 1.24 (π/2 relative phase). This study provides a new method to achieve single mode in LMA fiber amplifier and this filter would be extended to larger mode area fiber amplifier to improve the beam quality.

Paper Details

Date Published: 24 October 2017
PDF: 7 pages
Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104572Q (24 October 2017); doi: 10.1117/12.2284934
Show Author Affiliations
Xiang Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Gang Bai, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Ye Zheng, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Xiaolong Chen, Shanghai Institute of Optics and Fine Mechanics (China)
Yifeng Yang, Shanghai Institute of Optics and Fine Mechanics (China)
Yunfeng Qi, Shanghai Institute of Optics and Fine Mechanics (China)
Bing He, Shanghai Institute of Optics and Fine Mechanics (China)
Nanjing Institute of Advanced Laser Technology (China)
Jun Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Nanjing Zhongke Shenguang Science and Technology Co., Ltd. (China)


Published in SPIE Proceedings Vol. 10457:
AOPC 2017: Laser Components, Systems, and Applications
Shibin Jiang; Lijun Wang; Lan Jiang; Long Zhang, Editor(s)

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