5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber

Yisha Chen; Yun Ye; Liangjin Huang; Huan Yang; Hanshuo Wu; Zhiping Yan; Zhiyong Pan; Xiaolin Wang; Zefeng Wang; Pu Zhou

doi:10.3788/COL202422.041404

Chinese Optics Letters, Volume. 22, Issue 4, 041404(2024)

5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber

Yisha Chen^1,2,3, Yun Ye^1,2,3, Liangjin Huang^1,2,3、*, Huan Yang^1,2,3, Hanshuo Wu^1,2,3, Zhiping Yan^1,2,3, Zhiyong Pan^1,2,3, Xiaolin Wang^1,2,3、**, Zefeng Wang^1,2,3, and Pu Zhou¹

Author Affiliations

¹College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

²Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China

³Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China

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Figures & Tables(7)

$(a) Refractive index profile. (b) Absorption coefficient. (c) Bending loss of FM and HOM at given bending diameter of low-NA fiber used in the experiment.$

Fig. 1. (a) Refractive index profile. (b) Absorption coefficient. (c) Bending loss of FM and HOM at given bending diameter of low-NA fiber used in the experiment.

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Fig. 2. (a) Beam quality; (b) spectrum; (c) time domain; (d) frequency domain of seed laser at output power of 100 W.

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Fig. 3. Schematic setup of high-power low-NA fiber amplifier. LD, laser diode; HR, high reflectivity; YDF, ytterbium-doped fiber; OC, output coupling; CLS, cladding light stripper; GDF, germanium-doped fiber; QBH, quartz block head.

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Fig. 4. (a) Output power; (b) spectrum; (c) output time/frequency domain (inset); (d) beam waist spot; (e) beam quality; (f) STD at various output powers for experiment 1.

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Fig. 5. (a) Output power; (b) spectrum; (c) output time/frequency domain (inset); (d) beam waist spot; (e) beam quality; (f) STD at various output powers for experiment 2.

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Fig. 6. (a) Output power; (b) spectrum; (c) output time/frequency domain (inset); (d) beam waist spot; (e) beam quality; (f) STD at various output powers for experiment 3.

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Table 1. Summary of Key Parameters of Experiments 1 to 3
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Table 1. Summary of Key Parameters of Experiments 1 to 3
Experiment Pump wavelength (nm) Fiber length (m) Bending diameter (cm) Max output power (kW) Limitation
1 976 30 18 3.39 TMI
2 981 30 18 4.02 Insufficient absorption
3 981 35 18 4.96 TMI, SRS

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Yisha Chen, Yun Ye, Liangjin Huang, Huan Yang, Hanshuo Wu, Zhiping Yan, Zhiyong Pan, Xiaolin Wang, Zefeng Wang, Pu Zhou. 5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber[J]. Chinese Optics Letters, 2024, 22(4): 041404

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