Abstract

In this work, we carry out a systematic study on the evolution of relative intensity noise (RIN) in a high-power narrow-linewidth fiber laser system based on phase-modulated single-frequency seed laser. The experimental results clarify that enhancement of the RIN mainly occurs when the seed laser gets amplified from low power to medium power. In addition, further power scaling could lead to reduction of the RIN until it reaches saturation on the condition that the transverse mode instability (TMI) effect is effectively suppressed. Apart from the power scaling process, the phase-modulation would also lead to enhancement of the RIN at specific frequencies corresponded to the modulation frequency. More importantly, the contrast experiments reveal that the TMI effect could lead to obvious enhancement of the RIN of the signal laser during amplification well below the TMI threshold defined by the traditional method. Therefore, apart from degeneration of the RIN during amplification, potential enhancement of the RIN induced by the phase-modulation or the TMI effect below its traditional threshold should be carefully considered and controlled to achieve high-power low-noise fiber laser. Overall, our experimental results could provide a well reference for design of high-power low-noise fiber lasers and high-power narrow-linewidth fiber lasers.

Effects of background spectral noise in the phase-modulated single-frequency seed laser on high-power narrow-linewidth fiber amplifiers

Wei Liu, Jiaxin Song, Pengfei Ma, Hu Xiao, and Pu Zhou
Photon. Res. 9(4) 424-431 (2021)

Evaluation of the impact of weak end feedback on the SBS threshold in high-power narrow-linewidth fiber amplifiers

Wei Li, Yu Deng, Chen Qi, Yisha Chen, Pengfei Ma, Wei Liu, Zhou Pu, and Lei Si
Opt. Express 32(9) 16478-16490 (2024)

Bidirectional tandem-pumped high-brightness 6 kW level narrow-linewidth confined-doped fiber amplifier exploiting the side-coupled technique

Hanshuo Wu, Jiaxin Song, Pengfei Ma, Wei Liu, Shuai Ren, Guangjian Wang, Ruixian Li, Hu Xiao, Liangjin Huang, Jinyong Leng, Zhiyong Pan, and Pu Zhou
Opt. Express 30(12) 21338-21348 (2022)

Selection principle of seed power in high-power narrow linewidth fiber amplifier seeded by a FBGs-based fiber oscillator

Xin Tian, Binyu Rao, Xiaoming Xi, Meng Wang, Chongwei Wang, and Zefeng Wang
Opt. Express 31(8) 12016-12025 (2023)

Towards a tapered Yb-doped fiber-based narrow linewidth single-mode fiber laser with a high signal to Raman ratio

Yun Ye, Xiangming Meng, Xiaoming Xi, Zhiping Yan, Baolai Yang, Zhiyong Pan, Hanshuo Wu, Hanwei Zhang, Chen Shi, Xiaolin Wang, and Xiaojun Xu
Opt. Express 31(16) 26831-26841 (2023)