High-efficiency all-fiber Raman fiber amplifier with record output power

被引：13
|
作者：
Chen, Yizhu [1 ]
Leng, Jinyong [1 ,2 ,3 ]
Xiao, Hu [1 ,2 ,3 ]
Yao, Tianfu [1 ,2 ,3 ]
Xu, Jiangming [1 ,2 ,3 ]
Zhou, Pu [1 ,2 ,3 ]
机构：
[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Hunan, Peoples R China
[2] Hunan Prov Key Lab High Energy Laser Technol, Changsha 410073, Hunan, Peoples R China
[3] Hunan Prov Collaborat Innovat Ctr High Power Fibe, Changsha 410073, Hunan, Peoples R China
来源：
LASER PHYSICS LETTERS | 2018年 / 15卷 / 08期
关键词：
fiber laser; Raman laser; high-power; laser beam characterization; MU-M; BRIGHTNESS ENHANCEMENT; MULTIMODE FIBER; LASER; NM; DIODE;
D O I：
10.1088/1612-202X/aac428
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate a high-power, high-efficiency all-fiberized Raman fiber amplifier. The system is established on a master oscillator power amplifier configuration. The signal laser is a fiber oscillator operating at 1060nm, while multiple channels of fiber lasers at 1018nm work as the pump source. By amplifying in a piece of graded-index fiber, the output power of 1060nm reaches 528.8 W at maximum, with an optical-to-optical efficiency of 78.8%. The beam parameter M-2 increases from 10.4 to 4.2 through the stokes shift in the Raman fiber, with a corresponding brightness enhancement of about 3.85, which verifies the Raman beam cleanup in the multimode graded-index fiber. To the best of our knowledge, this is the highest-power all-fiber Raman amplifier reported with a brightness enhancement.
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页数：6
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