Raman suppression in high-power fiber laser oscillator by long period fiber grating

Results in Physics

Xiaofan Zhao¹  Xiaojun Xu¹  Meng Wang²  Qihao Hu³  Xin Tian³  Zefeng Wang³ 

[1] Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China;State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China;College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China;

关键词: Fiber laser;    Long period fiber grating;    Stimulate Raman scattering;   

DOI  :  

来源: DOAJ

【 摘 要 】

Stimulated Raman scattering (SRS) is a major limiting factor for better performance of high-power fiber lasers. Several spectral filtering methods have been used for Raman suppression, among which long period fiber grating (LPFG) is relatively simple and effective due to its all-fiber structure and broadband rejection properties. Here, a broadband, low insertion loss and low thermal effect LPFG is easily fabricated using CO2 laser by galvanometer scanning, then is used for SRS suppression within a high-power fiber oscillator for the first time. Results show that a maximum SRS suppression ratio of ~16 dB was achieved and the extractable Raman-free output power was increased by about 13% with the insertion of LPFG. This work has demonstrated a potentially applicable method for Raman suppression in high-power fiber oscillators.

【 授权许可】

Unknown