Optimization of random FBG array in multimode graded-index fiber for Raman lasing with improved spatio-spectral characteristics

被引：0
作者：
Kuznetsov, A. G. [1 ]
Wolf, A. A. [1 ]
Munkueva, Zh E. [1 ]
Dostovalov, A., V [1 ]
Babin, S. A. [1 ]
机构：
[1] Inst Automat & Electrometry SB RAS, 1 Koptyug Ave, Novosibirsk 630090, Russia
来源：
ADVANCED LASERS, HIGH-POWER LASERS, AND APPLICATIONS XIV | 2023年 / 12760卷
基金：
俄罗斯科学基金会;
关键词：
fiber laser; Raman laser; random laser; diode pumping; graded-index fiber; multimode; beam clean-up; FBG; array; BRIGHTNESS ENHANCEMENT; BEAM; QUALITY; LASER;
D O I：
10.1117/12.2689180
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report on the optimization of femtosecond-pulse inscribed arrays of short randomly-spaced FBGs for Raman lasing in multimode GRIN fiber pumped by highly-multimode (M-2 similar to 34) 940-nm diodes. The fabricated 1D-3D FBG arrays used as a complex output mirror together with input highly-reflective FBG provide random lasing of the Stokes beam at 976 nm with output power around 30 W. The optimization of array structure results in beam quality improvement to M-2<2 and the linewidth narrowing to 0.1-0.2 nm that is better than that for long regular FBG of comparable reflection. Potential of such cavity structure for further parameter improvement and its practical applications are discussed.
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页数：4
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