Mitigation of simulated Raman scattering in fiber laser oscillator using long period fiber grating

Qihao Hu; Xin Tian; Binyu Rao; Meng Wang; Zefeng Wang

doi:10.1117/12.2598910

6 June 2021 Mitigation of simulated Raman scattering in fiber laser oscillator using long period fiber grating

Qihao Hu, Xin Tian, Binyu Rao, Meng Wang, Zefeng Wang

Proceedings Volume 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021); 118490S (2021) https://doi.org/10.1117/12.2598910
Event: Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 2021, Suzhou, China

Abstract

The average output power of fiber laser oscillators can stabilize in very high levels reaching kW within the recent years. However, a further scaling is limited due to some nonlinear effects, one of which is simulated Raman scattering (SRS). Here we propose a CO₂ laser pulse inscribed transmission long period fiber grating (LPFG) in large mode area (LMA) fiber and employ it within a fiber laser oscillator to mitigate SRS. The wavelength of LPFG is designed to match the peak of SRS gain spectrum. By inserting the LPFG before the output coupling FBG (OC-FBG) of the oscillator, an efficient mitigation of SRS is observed. LPFGs represent a highly cost-effective fiber structure with potential for SRS suppession in high power fiber laser systems.

Citation Download Citation

Qihao Hu, Xin Tian, Binyu Rao, Meng Wang, and Zefeng Wang "Mitigation of simulated Raman scattering in fiber laser oscillator using long period fiber grating", Proc. SPIE 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 118490S (6 June 2021); https://doi.org/10.1117/12.2598910

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