Theoretical investigation on thermal lensing effects of Yb:KY(WO4)2 in diode-pumped lasers |
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| Authors: | Ronglian Niu Chengcheng Liu Lianjie Qin |
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| Institution: | a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China
b College of Environment and Materials Engineering, Yantai University, Yantai 264005, China |
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| Abstract: | Based on the features of laser diode end-pumped lasers, a thermal model of Yb:KY(WO4)2(Yb:KYW) with square cross-section was established. Considering the heat transfer on side faces, the anisotropic of thermal conductivity and the latest reports about thermo-optic coefficient, thermal expansion coefficient and thermal conductivity, temperature distribution, end-pumped face distortion and thermal lens focal length of Yb:KYW were more precisely obtained using finite difference method to solve Poisson equation in a rectangular Cartesian coordinate for the first time. At the pump power of 14 W, the highest temperature located at the center of end-pumped face was 243.8 °C, the highest distortion was 0.28 μm, and the thermal lens focal length was 5.4 cm along z-axis and −4.9 cm along x-axis. The results show that thermal lensing effects in the b-cut Yb:KYW were mainly determined by the anisotropic thermal expansion of Yb:KYW, and further present thermal lensing effects become weaker after considering the heat transfer. This work is significant for compensating the thermal lensing effect and improving the resonator stability of diode-pumped anisotropy crystal lasers. |
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| Keywords: | 42 55 Rz 42 55 Px 42 70 Hj 65 40 De |
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