Highly efficient CW laser operation in 4 at. % Tm3+ and 4 at. % Y3+ codoped CaF2 crystals

Xinsheng Guo; Qinghui Wu; Linyang Guo; Fengkai Ma; Fei Tang; Cheng Zhang; Jie Liu; Bingchu Mei; Liangbi Su

doi:10.3788/COL201816.051401

Journals >Chinese Optics Letters >Volume 16 >Issue 5 >Page 051401 > Article

Chinese Optics Letters
Vol. 16, Issue 5, 051401 (2018)

Highly efficient CW laser operation in 4 at. % Tm³⁺ and 4 at. % Y³⁺ codoped CaF₂ crystals

Xinsheng Guo^1、2, Qinghui Wu², Linyang Guo³, Fengkai Ma², Fei Tang², Cheng Zhang⁴, Jie Liu⁴, Bingchu Mei^1、*, and Liangbi Su^2、5、**

Author Affiliations

¹State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430070, China

²Synthetic Single Crystal Research Center, Key Laboratory of Transparent and Opto-Functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China

³State Key Laboratory on High Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun 130022, China

⁴Shandong Provincial Key Laboratory of Optics and Photonic Device, College of Physics and Electronics, Shandong Normal University, Jinan 250014, China

⁵State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China

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DOI: 10.3788/COL201816.051401 Cite this Article Set citation alerts

Xinsheng Guo, Qinghui Wu, Linyang Guo, Fengkai Ma, Fei Tang, Cheng Zhang, Jie Liu, Bingchu Mei, Liangbi Su. Highly efficient CW laser operation in 4 at. % Tm³⁺ and 4 at. % Y³⁺ codoped CaF₂ crystals[J]. Chinese Optics Letters, 2018, 16(5): 051401 Copy Citation Text

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Abstract

Tm : {CaF}_{2}

and

Tm, Y : {CaF}_{2}

single crystals were prepared by the temperature gradient technique. The spectral properties of

Tm, Y : {CaF}_{2}

single crystals were investigated and compared with those of

Tm : {CaF}_{2}

. It was demonstrated that codoping with

Y^{3 +}

ions could efficiently improve the spectroscopic properties.

Tm, Y : {CaF}_{2}

crystals have larger absorption cross-sections at the pumping wavelength, larger mid-infrared stimulated emission cross-sections, and much longer fluorescence lifetimes of the upper laser level (

{Tm}^{3 +} : {}^{3}{H_{4}}

level) than

Tm : {CaF}_{2}

crystals. Continuous-wave (CW) lasers around 1.97 μm were demonstrated in 4.0 at. % Tm,4.0 at. %

Y : {CaF}_{2}

single crystals under 792 nm laser diode (LD) pumping. The best laser performance has been demonstrated with a low threshold of 0.368 W, a high slope efficiency of 54.8%, and a maximum output power of 1.013 W.