Effective suppression of stimulated Raman scattering in high-power fiber oscillators using single CTFBG

Shan Huang; Yu Liu; Xiaotong Gao; Rumao Tao; Honghuan Lin; Jianjun Wang

doi:10.1117/12.3023069

18 March 2024 Effective suppression of stimulated Raman scattering in high-power fiber oscillators using single CTFBG

Shan Huang, Yu Liu, Xiaotong Gao, Rumao Tao, Honghuan Lin, Jianjun Wang

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131042E (2024) https://doi.org/10.1117/12.3023069
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

We report the effective suppression of stimulated Raman scattering (SRS) in a high-power fiber laser oscillator with 15 m long delivery fibers by the insertion of a single chirped and tilted fiber Bragg grating (CTFBG). Inscribed in 20/400 μm fiber, the single CTFBG has been carefully designed and fabricated with a filter bandwidth of 22.8 nm to match the Raman gain spectrum. A maximum suppression ratio over 30 dB is achieved when the oscillator operates at 2.7 kW, with beam quality factor M² of ~1.4. Moreover, the signal insertion loss is measured to be around 0.2 dB and the maximum temperature is about 41.6 °C at a room temperature of 25 °C. By improving the performance of CTFBG, a further power scaling and longer delivery distance of high-power fiber lasers could be achieved.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Shan Huang, Yu Liu, Xiaotong Gao, Rumao Tao, Honghuan Lin, and Jianjun Wang "Effective suppression of stimulated Raman scattering in high-power fiber oscillators using single CTFBG", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131042E (18 March 2024); https://doi.org/10.1117/12.3023069

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