Ruiting Cao, Gui Chen, Yisha Chen, Zhilun Zhang, Xianfeng Lin, Bin Dai, Luyun Yang, Jinyan Li, "Effective suppression of the photodarkening effect in high-power Yb-doped fiber amplifiers by H2 loading," Photonics Res. 8, 288 (2020)
- Photonics Research
- Vol. 8, Issue 3, 288 (2020)
Fig. 1. (a) Measurement scheme of PD loss; (b) structure of high-power MOPA system.
Fig. 2. Absorption spectra before and after 300 min pumping of (a) the pristine N1 fiber and (b) the H 2
Fig. 3. PD-induced excess loss and fitting curve at 633, 702, 810, and 1041 nm for (a) the pristine N1 fiber and (b) the H 2
Fig. 4. Time dependence of the output power of the pristine N2 fiber.
Fig. 5. Output power and STD as functions of pump power for the pristine N2 fiber.
Fig. 6. Time-domain signal and frequency-domain signal of the pristine N2 fiber at the initial state.
Fig. 7. Evolution of the MI threshold of the pristine N2 fiber.
Fig. 8. Relative transmittance at 638 nm of the pristine N2 fiber before and after 300 min pumping, and the calculated inversion along the fiber.
Fig. 9. Time dependence of output power in the H 2
Fig. 10. Output power and STD as functions of pump power for the H 2
Fig. 11. Time-domain signal and frequency-domain signal of the H 2
Fig. 12. Relative transmittance at 638 nm of the pristine N2 fiber and the H 2
Fig. 13. Schematic representation of H 2
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