材料科学
光学
光纤布拉格光栅
光纤激光器
磷
激光器
飞秒
长周期光纤光栅
光电子学
包层(金属加工)
光子晶体光纤
保偏光纤
啁啾声
光纤
光纤传感器
波长
物理
冶金
作者
Hao Li,Meng Wang,Baiyi Wu,Xinyu Ye,Chenhui Gao,Binyu Rao,Xin Tian,Xiaoming Xi,Zilun Chen,Zefeng Wang,Jinbao Chen
出处
期刊:Optics Express
[The Optical Society]
日期:2023-03-22
卷期号:31 (8): 13393-13393
被引量:9
摘要
Chirped and tilted fiber Bragg gratings (CTFBGs) are important all-fiber filtering components in high-power fiber lasers for stimulated Raman scattering (SRS) suppression. The fabrication of CTFBGs in large-mode-area double-cladding fibers (LMA-DCFs) by femtosecond (fs) laser is reported for the first time to the best of our knowledge. The chirped and tilted grating structure is obtained by scanning the fiber obliquely and moving the fs-laser beam relative to the chirped phase mask at the same time. By this method, the CTFBGs with different chirp rates, grating lengths, and tilted angles are fabricated, and the maximum rejection depth and bandwidth are ∼25 dB and ∼12 nm, respectively. To test the performance of the fabricated CTFBGs, one is inserted between the seed laser and the amplifier stage of a 2.7 kW fiber amplifier, and an SRS suppression ratio of ∼4 dB is achieved with no reduction in laser efficiency and degradation in beam quality. This work provides a highly fast and flexible method to fabricate large-core CTFBGs, which is of great significance to the development of high-power fiber laser systems.
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