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Tm:YAG single-crystal fiber laser

Jian Liu, Jifei Dong, Yinyin Wang, Jun Guo, Yanyan Xue, Jun Xu, Yongguang Zhao, Xiaodong Xu, Haohai Yu, Zhengping Wang, Xinguang Xu, Weidong Chen, and Valentin Petrov

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Abstract

In this Letter, to the best of our knowledge, we present the first thulium (Tm) single-crystal fiber (SCF) laser with free-space propagation of the laser beam only. The SCF is equipped with diffusion-bonded end caps of undoped YAG for better thermal management and enhancement of pump guiding. By utilizing mode matching and pump guiding in different SCF parts, an output power of 9.1 W is achieved at ${\sim}2.02\;\unicode{x00B5}{\rm m}$ with a slope efficiency of 49.4%. This straightforward approach, which is also simple to realize and is based on combining the advantages of fiber-geometry structure and crystalline properties of Tm:YAG, is expected to be useful for 2 µm amplification stages in different time formats as well.

© 2021 Optical Society of America

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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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