Investigation on the thermal blooming effect in a high power spectral beam combining fiber laser system

被引：6

作者：

Zheng, Ye ^{[1
]}

Liu, Xiaoxi ^{[1
]}

He, Miao ^{[1
]}

Zhang, Lin ^{[1
]}

Yu, Miao ^{[1
]}

Li, Siyuan ^{[1
]}

Ma, Ziyang ^{[1
]}

Wang, Junlong ^{[1
]}

Wang, Xuefeng ^{[1
]}

机构：

[1] Beijing Inst Aerosp Control Devices, Beijing 100094, Peoples R China

来源：

APPLIED OPTICS | 2022年 / 61卷 / 04期

基金：

中国国家自然科学基金;

关键词：

COMBINATION;

D O I：

10.1364/AO.447850

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate the influence of the thermal blooming effect on the far-field beam quality in a seven-channel spectral beam combining system. Stimulated Raman scattering in the incident narrow-linewidth fiber amplifier is verified to be the dominant factor that induces thermal blooming in the beam combining system. When the power density of Raman light reaches only 180 W/cm(2), the peak intensity of the far-field beam reduces severely and the beam distribution profile spreads. We reveal that H2O content in the atmosphere has a positive relationship with the thermal blooming effect and study the influence of the humidity on the thermal blooming effect. The influence of the optical path length on the thermal blooming effect is also revealed. The result shows that the focusing property of the far-field beam degrades gradually as the optical path length increases from 100 to 450 mm. The results are conducive to optimize the beam quality of spectral beam combining. (C) 2022 Optica Publishing Group

引用

页码：954 / 959

页数：6

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