Raman suppression in kW-level narrow-linewidth one-stage MOPA fiber laser by CTFBG

Xiaofan Zhao; Xin Tian; Meng Wang; Xiaoming Xi; Qiushi Qin; Zefeng Wang

doi:10.1117/12.2598771

6 June 2021 Raman suppression in kW-level narrow-linewidth one-stage MOPA fiber laser by CTFBG

Xiaofan Zhao, Xin Tian, Meng Wang, Xiaoming Xi, Qiushi Qin, Zefeng Wang

Proceedings Volume 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021); 118490O (2021) https://doi.org/10.1117/12.2598771
Event: Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 2021, Suzhou, China

Abstract

The one-stage master oscillator power amplifier (MOPA) is an efficient way to acquire high-power narrow-linewidth fiber lasers (NLFLs), which have wide usage in beam combination and detection. However, stimulated Raman scattering (SRS) is still one of the main obstacles for further power scaling. In this paper, we set up a counter-pumping kW-level narrowlinewidth one-stage MOPA fiber laser system and tried to use a chirped and tilted fiber Bragg grating (CTFBG) as a broadband rejection filter to suppress the Raman stokes light in the output laser. We finally acquired a 2.5 kW output with 3 dB linewidth of about 0.87 nm, and the SRS isolation ratio is ~42 dB on the spectrum, which is 12.7 dB higher compared with the situation without CTFBG.

Citation Download Citation

Xiaofan Zhao, Xin Tian, Meng Wang, Xiaoming Xi, Qiushi Qin, and Zefeng Wang "Raman suppression in kW-level narrow-linewidth one-stage MOPA fiber laser by CTFBG", Proc. SPIE 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 118490O (6 June 2021); https://doi.org/10.1117/12.2598771

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