用于2.86微米激光器的Ho/Pr共掺杂AlF基玻璃光纤中布拉格光栅的直接飞秒激光写入

Direct femtosecond laser inscription of Bragg gratings in Ho/Pr co-doped AlF-based glass fibers for a 2.86 µm laser.

作者信息

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

出版信息

Opt Lett. 2022 Feb 1;47(3):597-600. doi: 10.1364/OL.448431.

DOI:10.1364/OL.448431

PMID:35103685

Abstract

In this Letter, we report the fabrication of fiber Bragg gratings (FBGs) in home-made Ho/Pr co-doped single-cladding fluoroaluminate (AlF) 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.

摘要

在本信函中，我们报告了在自制的 Ho/Pr 共掺杂单包层氟铝酸盐（AlF）玻璃光纤中制作光纤布拉格光栅（FBG）及其在 2.86 µm 中红外（MIR）波长的瓦级激光发射中的应用。使用 800 nm 飞秒（fs）激光直写技术写入 FBG。研究了不同脉冲能量、写入速度、光栅阶数和横向长度下的 FBG 特性。在一根 16.5 cm 长的增益光纤一端获得了反射率高达 99%的二阶 FBG。在 1150 nm 激光泵浦下，该光纤在 2863.9 nm 处产生的功率超过 1 W，总激光效率为 17.7%。该光纤激光器的半高宽带宽为 0.46 nm，并且具有长期光谱稳定性。