A high-power dual-crystal Tm: YLF laser with 80.9% slope efficiency

doi:10.1088/1674-1056/adf4ac

Abstract We demonstrate a high-power continuous-wave Tm:YLF laser with exceptional efficiency, achieved through laser diode end-pumping of dual Tm:YLF crystals in a thermally insensitive resonator at room temperature. The performance of the Tm:YLF laser system has been thoroughly investigated, covering output power, efficiency, power stability, and beam quality. A maximum output power of 45.85 W was achieved with an absorbed pump power of 60.89 W. The slope efficiency and absorbed-to-optical conversion efficiency were 80.9% and 75.3%, respectively. The laser exhibits excellent stability, with an RMS power stability of 0.33%. The beam quality ($M^{2}$) of the Tm:YLF laser in the horizontal and vertical directions were 1.01 and 1.05, respectively. This high-performance laser source is ideal for pumping holmium-doped crystals to generate 2-μm laser and mid-infrared laser generation via nonlinear optical processes.

Keywords: Tm:YLF 2-μm laser high efficiency

Received: 21 April 2025
Revised: 10 June 2025
Accepted manuscript online: 28 July 2025

PACS:	42.55.Xi	(Diode-pumped lasers)
	42.60.-v	(Laser optical systems: design and operation)
	42.55.-f	(Lasers)
	42.55.Ah	(General laser theory)

Fund: Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA0380205 and XDB0890101), the National Key Research and Development Program of China (Grant No. 2022YFA1604400), the National Natural Science Foundation of China (Grant Nos. 12388102, 62205351, 61925507, 62075227, 22227901, U21A20138, and 62375273), Shanghai Rising-Star Program (Grant No. 21QA1410200), the Fund from Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2020248), the Fund from Shanghai Association for Science and Technology (Grant Nos. 22DZ1100300, 22560780100, and 23560750200), China Postdoctoral Science Foundation (Grant No. GZC20232817), and Shenzhen Major Scientific and Technological Projects (Grant No. KJZD20240903100205008).

Corresponding Authors: Jiajun Song, Yujie Peng, Yuxin Leng
E-mail: songjiajun@siom.ac.cn;yjpeng@siom.ac.cn;lengyuxin@siom.ac.cn

Cite this article:

Yinfei Liu(刘寅飞), Jiajun Song(宋贾俊), Yujie Peng(彭宇杰), Guanguang Gao(高贯光), Liya Shen(沈丽雅), Junze Zhu(朱君泽), Tianze Xu(徐天泽), and Yuxin Leng(冷雨欣) A high-power dual-crystal Tm: YLF laser with 80.9% slope efficiency 2026 Chin. Phys. B 35 034202

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A high-power dual-crystal Tm: YLF laser with 80.9% slope efficiency

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