2 kW monolithic fiber amplifier based on constant-cladding tapered-core Yb-doped fiber

Yun Ye; Xianfeng Lin; Xiaoming Xi; Lingfa Zeng; Baolai Yang; Hanwei Zhang; Xiaolin Wang; Jinyan Li; Xiaojun Xu

doi:10.1117/12.2587548

2 December 2020 2 kW monolithic fiber amplifier based on constant-cladding tapered-core Yb-doped fiber

Yun Ye, Xianfeng Lin, Xiaoming Xi, Lingfa Zeng, Baolai Yang, Hanwei Zhang, Xiaolin Wang, Jinyan Li, Xiaojun Xu

Proceedings Volume 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics; 1171735 (2020) https://doi.org/10.1117/12.2587548
Event: 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 2020, Shanghai, China

Abstract

In this work, we reported a 2 kW monolithic master oscillator-power amplifier (MOPA) configuration based on a novel constant-cladding tapered-core (CCTC) Yb-doped fiber. The CCTC fiber has a constant cladding diameter of ~400 μm and a varying core diameter along the fiber, with a ~24 μm at both ends and ~31 μm in the middle. This special fiber design can not only effectively suppress the stimulated Raman scattering, but also smooth the thermal load in the fiber. The output performance of this fiber was carefully investigated in a bidirectional pump MOPA configuration with respective co-pump and counter-pump scheme, especially on the aspects of the SRS and TMI. As a result, the TMI threshold is measured at ~870 W and ~1980 W in the co-pump and counter-pump scheme, respectively. The maximum output power of 2023 W is achieved with no sign of SRS in the counter-pump scheme. Before the TMI threshold, the beam quality (M2 factor) remains ~1.4 without any mode distortion, and the M2 factor is measured to be ~1.65 at the maximum output power. These results indicate that the CCTC fiber has great potential to simultaneously mitigate the SRS and TMI effect in the high power operation.

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Yun Ye, Xianfeng Lin, Xiaoming Xi, Lingfa Zeng, Baolai Yang, Hanwei Zhang, Xiaolin Wang, Jinyan Li, and Xiaojun Xu "2 kW monolithic fiber amplifier based on constant-cladding tapered-core Yb-doped fiber", Proc. SPIE 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 1171735 (2 December 2020); https://doi.org/10.1117/12.2587548

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