Fabrication of chirped and tilted fiber Bragg gratings for single-mode fiber lasers

In this paper, we propose that a Chirped and Tilted Fiber Bragg Grating (CTFBG) can be fabricated in the 14um-core fiber to suppress SRS to achieve a higher-power single-mode fiber laser. The results show that the CTFBGs can suppress the SRS about 25 dB, and the power of the 14um-core single-mode fiber laser can be improved to 3 kW. The M² of the laser is less than 1.20. The CTFBGs are fabricated with an excimer laser and the heating rate of the recoated CTFBGs are less than 0.01 °C/W. The research results have certain significance for suppressing SRS in high-power single-mode fiber lasers with CTFBG for improving the output power.