1.2 W single-frequency Tm<sup>3+</sup>/Ho<sup>3+</sup> co-doped fiber oscillator at 2050 nm

Chaodu Shi; Chaodu Shi; Peiheng Jiang; Peiheng Jiang; Shijie Fu; Shijie Fu; Quan Sheng; Quan Sheng; Lin Chen; Wei Shi; Wei Shi; Wei Shi; Cailing Fu; Cailing Fu; Yiping Wang; Jianquan Yao; Jianquan Yao

doi:10.1364/OL.502554

Optics Letters
Vol. 48,
Issue 23,
pp. 6144-6147
(2023)
•https://doi.org/10.1364/OL.502554

1.2 W single-frequency Tm³⁺/Ho³⁺ co-doped fiber oscillator at 2050 nm

Chaodu Shi, Peiheng Jiang, Shijie Fu, Quan Sheng, Lin Chen, Wei Shi, Cailing Fu, Yiping Wang, and Jianquan Yao

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Chaodu Shi, Peiheng Jiang, Shijie Fu, Quan Sheng, Lin Chen, Wei Shi, Cailing Fu, Yiping Wang, and Jianquan Yao, "1.2 W single-frequency Tm³⁺/Ho³⁺ co-doped fiber oscillator at 2050 nm," Opt. Lett. 48, 6144-6147 (2023)

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Abstract

In this Letter, a watt-level single-frequency fiber oscillator at 2050 nm was demonstrated for the first time, to the best of our knowlegde, in a linear laser cavity with a piece of an un-pumped Tm³⁺/Ho³⁺ co-doped fiber serving as a saturable absorber. With delicate optimization of mode filtering effect of the dynamic gratings formed in the saturable absorber, a maximum single-frequency laser output power of 1.2 W was achieved under a total bidirectional pump power of 5.8 W at 1570 nm, and the corresponding optical efficiency is 20.7%. This is, to the best of our knowledge, the highest power of a single-frequency fiber oscillator at the wavelength above 2 µm.

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Corrections

22 November 2023: Typographical corrections were made to the author affiliations.

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