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• Chinese Optics Letters
• Vol. 19, Issue 9, 091405 (2021)
Fei Wang, Haitao Huang*, Haiwei Chen, Yushuo Bao, Zihan Li, and Deyuan Shen
Author Affiliations
• School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China
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Abstract

The population trapping effect of the $F34$ level is an important factor limiting the power scaling of the 2.3 μm thulium (Tm) laser on the $H34→H35$ transition. In this Letter, we demonstrate a novel scheme of ground state absorption (GSA) ($H36→H34$) and excited state absorption (ESA) ($F34→H34$) dual-wavelength pumped 2.3 μm Tm lasers. Introducing an ESA pumping process can accurately excite the $Tm3+$ ions accumulated in the $F34$ level to the $H34$ level, constructing a double populating mechanism for the upper laser level $H34$. A proof-of-principle experimental demonstration of the GSA (785 nm) and ESA (1470 nm) dual-wavelength pumped 2.3 μm $Tm:LiYF4$ (Tm:YLF) laser was realized. A maximum continuous-wave output power of 1.84 W at 2308 nm was achieved under 785 and 1470 nm dual-wavelength pumping, increased by 60% compared with the case of 785 nm single-wavelength pumping under the same resonator condition. Our work provides an efficient way to achieve higher output power from 2.3 μm Tm-doped lasers on the $H34→H35$ transition.
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Fei Wang, Haitao Huang, Haiwei Chen, Yushuo Bao, Zihan Li, Deyuan Shen. GSA and ESA dual-wavelength pumped 2.3 μm Tm:YLF laser on the 3H43H5 transition[J]. Chinese Optics Letters, 2021, 19(9): 091405