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
- Chinese Optics Letters
- Vol. 22, Issue 4, 041404 (2024)
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.
Fig. 2. (a) Beam quality; (b) spectrum; (c) time domain; (d) frequency domain of seed laser at output power of 100 W.
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.
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.
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.
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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