Demonstration of SRS filtering at the output of 2kW fiber laser by CTFBG

Xiaofan Zhao; Meng Wang; Xin Tian; Binyu Rao; Hongye Li; Zefeng Wang

doi:10.1117/12.2598770

6 June 2021 Demonstration of SRS filtering at the output of 2kW fiber laser by CTFBG

Xiaofan Zhao, Meng Wang, Xin Tian, Binyu Rao, Hongye Li, Zefeng Wang

Proceedings Volume 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021); 118490N (2021) https://doi.org/10.1117/12.2598770
Event: Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 2021, Suzhou, China

Abstract

Chirped and tilted fiber Bragg gratings (CTFBGs) have attracted a lot of attention for stimulated Raman scattering (SRS) suppression in high-power fiber laser systems in past years. Here, we fabricate CTFBGs in large-mode-area double cladding fibers and demonstrate its application in a 2-kW fiber laser for SRS filtering at the system’s output. A maximum Raman suppression of about 17 dB is obtained at the central wavelength, and the insertion loss is smaller than 0.2 dB for signal laser. In addition, no obvious degradation of laser beam quality is observed. Better suppression effect could be achieved by broadening the rejection bandwidth of the CTFBGs in the future.

Citation Download Citation

Xiaofan Zhao, Meng Wang, Xin Tian, Binyu Rao, Hongye Li, and Zefeng Wang "Demonstration of SRS filtering at the output of 2kW fiber laser by CTFBG", Proc. SPIE 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 118490N (6 June 2021); https://doi.org/10.1117/12.2598770

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