The large core diameter fiber Bragg grating written by femtosecond laser

Hao Li; Xinyu Ye; Meng Wang; Baiyi Wu; Lingfa Zeng; Chenhui Gao; Xin Tian; Peng Wang; Baolai Yang; Xiaoming Xi; Xiaolin Wang; Zefeng Wang; Jinbao Chen

doi:10.1117/12.2656299

16 December 2022 The large core diameter fiber Bragg grating written by femtosecond laser

Hao Li, Xinyu Ye, Meng Wang, Baiyi Wu, Lingfa Zeng, Chenhui Gao, Xin Tian, Peng Wang, Baolai Yang, Xiaoming Xi, Xiaolin Wang, Zefeng Wang, Jinbao Chen

Author Affiliations +

Proceedings Volume 12501, Seventeenth National Conference on Laser Technology and Optoelectronics; 125010U (2022) https://doi.org/10.1117/12.2656299
Event: Seventeenth National Conference on Laser Technology and Optoelectronics, 2022, Shanghai, China

Abstract

With the development of high power fiber oscillators, it is urgent to fabricate fiber Bragg gratings (FBGs) on large core fibers. Here, a pair of FBGs in fibers with core diameter of 30 μm are fabricated based on femtosecond laser phase mask scanning method. The reflectivity of high-reflectivity FBG (HR-FBG) is more than 99% with the central wavelength of 1080 nm and the 3dB bandwidth of 3.6 nm. The reflectivity of output coupler FBG (OC-FBG) is about 10% with the central wavelength of 1079.8 nm and the 3dB bandwidth of 2 nm. Furthermore, an all-fiber oscillator is built based on the fs-written FBGs, and the maximum output power of 6.4 kW is realized with the optical-optical conversion efficiency of 74%. The temperatures of HR-FBG and LR-FBG are 90 and 49℃, respectively. This work demonstrates that the large core diameter FBG written by femtosecond laser has excellent performance, which is of great significance for the development of high power fiber oscillators.

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Hao Li, Xinyu Ye, Meng Wang, Baiyi Wu, Lingfa Zeng, Chenhui Gao, Xin Tian, Peng Wang, Baolai Yang, Xiaoming Xi, Xiaolin Wang, Zefeng Wang, and Jinbao Chen "The large core diameter fiber Bragg grating written by femtosecond laser", Proc. SPIE 12501, Seventeenth National Conference on Laser Technology and Optoelectronics, 125010U (16 December 2022); https://doi.org/10.1117/12.2656299

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