Mode Instability Mitigation by Counter-Pumped Scheme in High Power Fiber Laser

Li Zebiao; Guo Chao; Zhao Pengfei; Huang Zhihua; Xiang Xiaoyu; Liang Xiaobao; Li Chengyu; Lin Honghuan; Wang Jianjun; Jing Feng; Xu Shanhui; Yang Zhongmin

doi:10.3788/CJL201744.0801010

Chinese Journal of Lasers, Volume. 44, Issue 8, 801010(2017)

Mode Instability Mitigation by Counter-Pumped Scheme in High Power Fiber Laser

Li Zebiao^1,2、*, Guo Chao¹, Zhao Pengfei¹, Huang Zhihua¹, Xiang Xiaoyu¹, Liang Xiaobao¹, Li Chengyu¹, Lin Honghuan¹, Wang Jianjun¹, Jing Feng¹, Xu Shanhui², and Yang Zhongmin²

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¹[in Chinese]

²[in Chinese]

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Fig. 1. Experimental setup diagram

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Fig. 2. M2 variation of co-pumped and counter-pumped lasers with output power

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Fig. 3. Spectra of co-pumped and counter-pumped lasers with the output power of 2 kW

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Fig. 4. Relationship between the laser amplification power and the pump power of the counter-pumped laser (the inset shows variation of output power with time within one hour)

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Table 1. Calculation results of mode instability threshold
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Table 1. Calculation results of mode instability threshold
Fiber Length /m Co-pump /W Counter-pump /W Bi-pump /W
20 μm/400 μm 15 1853 4716 3195
25 μm/400 μm 12 1402 3285 2440
30 μm/400 μm 8 1185 2356 1903

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Li Zebiao, Guo Chao, Zhao Pengfei, Huang Zhihua, Xiang Xiaoyu, Liang Xiaobao, Li Chengyu, Lin Honghuan, Wang Jianjun, Jing Feng, Xu Shanhui, Yang Zhongmin. Mode Instability Mitigation by Counter-Pumped Scheme in High Power Fiber Laser[J]. Chinese Journal of Lasers, 2017, 44(8): 801010

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