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Direct femtosecond laser inscription of Bragg gratings in Ho3+/Pr3+ co-doped AlF3-based glass fibers for a 2.86 µm laser

Niannian Xu, Zhiyong Yang, Jiquan Zhang, Nian Lv, Mo Liu, Ruoning Wang, Zhenrui Li, Shijie Jia, Gilberto Brambilla, Shunbin Wang, and Pengfei Wang

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Abstract

In this Letter, we report the fabrication of fiber Bragg gratings (FBGs) in home-made Ho3+/Pr3+ co-doped single-cladding fluoroaluminate (AlF3) glass fibers and its application in watt-level lasing at the mid-infrared (MIR) wavelength of 2.86 µm. The FBGs were inscribed using an 800 nm femtosecond (fs) laser direct-writing technique. The FBG properties were investigated for different pulse energies, inscription speeds, grating orders, and transversal lengths. A second-order FBG with a high reflectivity of 99% was obtained at one end of a 16.5-cm-long gain fiber. Under 1150 nm laser pumping, this fiber yielded a power exceeding 1 W at 2863.9 nm with an overall laser efficiency of 17.7%. The fiber laser showed a FWHM bandwidth of 0.46 nm and long-term spectral stability.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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