High-efficiency 2&#x2009;&#x2009;&#x03BC;m continuous-wave laser in laser diode-pumped Tm3+, La3+: CaF2 single crystal

Zhen Zhang; Xinsheng Guo; Jingya Wang; Cheng Zhang; Jie Liu; Liangbi Su

doi:10.1364/OL.43.004300

Optics Letters
Vol. 43,
Issue 17,
pp. 4300-4303
(2018)
•https://doi.org/10.1364/OL.43.004300

High-efficiency 2 μm continuous-wave laser in laser diode-pumped Tm³⁺, La³⁺: CaF₂ single crystal

Zhen Zhang, Xinsheng Guo, Jingya Wang, Cheng Zhang, Jie Liu, and Liangbi Su

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Zhen Zhang, Xinsheng Guo, Jingya Wang, Cheng Zhang, Jie Liu, and Liangbi Su, "High-efficiency 2 μm continuous-wave laser in laser diode-pumped Tm³⁺, La³⁺: CaF₂ single crystal," Opt. Lett. 43, 4300-4303 (2018)

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Abstract

A ${Tm}^{3 +}$ , ${La}^{3 +} : {CaF}_{2}$ single crystal was grown, and its spectral properties and laser performance were investigated. Under diode end-pumping, a continuous-wave laser has been demonstrated. The slope efficiency of up to 67.8% was first achieved in the co-doping crystal, which is close to twice the theoretical quantum efficiency. A maximum output power of 4.269 W and a broad tunable range of 192 nm were also obtained, indicating this system is a promising candidate for highly efficient $\sim 2 μm$ lasers.

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Material	Toc /%	$η_{abs} / %$	$P_{thr} / mW$	$P_{out} / mW$	$λ_{out} / nm$	Refs.
12 at. % $Tm : {BaY}_{2} F_{8}$	5	32	185	645	1932	[23]
12 at. % $Tm : {LiLuF}_{4}$	0.5	56	65	280	$\sim 2025$	[24]
1.34 at.% $Tm : {CaF}_{2}$	10	41	68	$\sim 140$	1887	[15] ^a
12 at. % $Tm : {GdLiF}_{4}$	0.5	53	40	205	$\sim 2000$	[25]
5.2 at. % $Tm : {SrF}_{2}$	0.3	50	65	240	2015	[26]
4 at. % Tm, 4 at. % $Y : {CaF}_{2}$	5	51.5	$\sim 222$	1013	$\sim 2000$	[18]
3 at. % Tm, 2 at. % $La : {CaF}_{2}$	5	67.8	372	4269	1921	This work

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