Experimental Study on Transverse Mode Instability of All-Fiber Single-Frequency Amplifier Based on Tapered Yb-Doped Fiber

被引：0
|
作者：
Tao, Yue [1 ]
Mo, Zhengfei [1 ]
Kang, Pengrui [1 ]
Jiang, Man [1 ]
Li, Can [1 ]
Leng, Jinyong [1 ,2 ,3 ]
Zhou, Pu [1 ]
Jiang, Zongfu [1 ,2 ,3 ]
机构：
[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Peoples R China
[2] Natl Univ Def Technol, Nanhu Laser Lab, Changsha 410073, Peoples R China
[3] Natl Univ Def Technol, Hunan Prov Key Lab High Energy Laser Technol, Changsha 410073, Peoples R China
来源：
PHOTONICS | 2024年 / 11卷 / 08期
基金：
中国国家自然科学基金;
关键词：
single-frequency; transverse mode instability; tapered Yb-doped fiber; bending diameter; high power; HIGH-POWER; LASER; ORIGIN; NOISE;
D O I：
10.3390/photonics11080696
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We experimentally studied the transverse mode instability (TMI) threshold of a linearly polarized single-frequency fiber laser amplifier constructed with tapered ytterbium-doped fiber (TYDF) under different bending diameters. The TMI threshold increased from 333 W to 451 W by reducing the bending diameter from 16 cm to 12 cm, which was accompanied by the deterioration of the beam quality from 1.47 to 1.67. The anomalous characteristics between the TMI threshold, bending diameter, and beam quality are mainly attributed to the decreased bending loss of higher-order mode (HOM) content as a result of the increased system heat loads caused by a tight bending-induced loss of amplification efficiency. It is believed that the presented results will provide useful guidelines for the design of high-power single-frequency fiber amplifiers.
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页数：8
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