Zichen Bai, Zhixiang Chen, Yujie Xiong, Hongliang Liu, Siying Gao, Yingying Ren, Xingjuan Zhao, Fengqin Liu, Yuechen Jia, Feng Chen
In this work, we report on the first, to our knowledge, 2.05-µm laser based on femtosecond-laser direct written (FsLDW) Tm,Ho:YLF cladding waveguides. A channel waveguide with a 90-µm diameter "fiber-like" low-index cladding is fabricated in a 6 at. % Tm3+ , 0.4 at. % Ho3+ :LiYF4 crystal by FsLDW. Pumped by Ti:sapphire laser at 795.1 nm, the fabricated waveguide supports efficient lasing oscillation at 2050 nm with a maximum output power of 47.5 mW, a minimum lasing threshold of 181 mW, and a slope efficiency of 20...
April 15, 2024: Optics Letters