[4] Lü R D, Chen T, Fan C S et al. Application of fiber lasers based on femtosecond laser inscribed fiber Bragg gratings[J]. Laser & Optoelectronics Progress, 57, 111426(2020).
[14] Rao Y J, Wang Y P, Zhu T[M]. Theory and applications of fiber gratings, 137-138(2006).
[17] Chen C. Fabrication of robust fiber gratings by femtosecond laser and their applications[D], 30-32(2014).