Highly efficient dual-wavelength mid-infrared CW Laser in diode end-pumped Er:SrF2single crystals.
The spectral properties and laser performance of Er:SrF2single crystals were investigated and compared with Er:CaF2. Er:SrF2crystals 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 (Er3+:4I11/2level) than those of Er:CaF2crystals. Dual-wavelength continuous-wave (CW) lasers around 2.8 μm were demonstrated in both 4at.% and 10at.% Er:SrF2single crystals under 972 nm laser diode (LD) end pumping. The laser wavelengths are 2789.3 nm and 2791.8 nm in the former, and 2786.4 nm and 2790.7 nm in the latter, respectively. The best laser performance has been demonstrated in lightly doped 4at.% Er:SrF2with a low threshold of 0.100 W, a high slope efficiency of 22.0%, an maximum output power of 0.483 W.
Synthetic Single Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No.588 Heshuo Road, Shanghai 201899, China.|Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China.|University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China.
Weiwei
W
Ma
Synthetic Single Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No.588 Heshuo Road, Shanghai 201899, China.|Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China.
Xiaobo
X
Qian
Synthetic Single Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No.588 Heshuo Road, Shanghai 201899, China.|Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China.
Jingya
J
Wang
Institute of Data Science and Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Jingjing
J
Liu
Institute of Data Science and Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Xiuwei
X
Fan
Institute of Data Science and Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Jie
J
Liu
Synthetic Single Crystal Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, No.588 Heshuo Road, Shanghai 201899, China.|Key Laboratory of Transparent and Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China.
Liangbi
L
Su
School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China.
Jun
J
Xu