J. Luo, S. J. Fan, H. Q. Xie, K. C. Xiao, S. X. Qian, Z. W. Zhong, G. X. Qian, R. Y. Sun, J. Y. Xu: Thermal and Nonlinear Optical Properties of Ca4YO(BO3)3(YCOB)

Crystal Research and Technology

Cryst. Res. Technol. 36 (2001) 1215 - Abstract -

J. Luo, S. J. Fan, H. Q. Xie, K. C. Xiao*, S. X. Qian*, Z. W. Zhong, G. X. Qian, R. Y. Sun, J. Y. Xu

Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China
*Department of Physics, Fudan University, Shanghai, China

Thermal and Nonlinear Optical Properties of Ca₄YO(BO₃)₃

Ca₄YO(BO₃)₃ (YCOB) crystals have been grown using the vertical Bridgman method. The thermal properties of YCOB were measured for the first time to our knowledge. The specific heat is 729.7 J/kg K at 373K. The average thermal expansion coefficients along the a, b and c axes are 9.9x10^-6 /K, 8.2x10^-6 /K and 12.8x10^-6 /K, respectively, in the temperature range of 293-1173K. The thermal conductivities along the a, b and c axes are 1.83W/mK, 1.72W/mK and 2.17W/mK at 373K. The anisotropy in the measured thermal conductivities of YCOB is consistent with the experimental results of the thermal expansion. The SHG of a Nd: YAG laser was compared with that of a KDP crystal. The effective nonlinear coefficients (d_eff) of YCOB in type I phase matching directions of (Theta, phi)=(66.3°, 143.5°) and (65.9°, 36.5°) were estimated to be 1.45pm/V and 0.91pm/V, respectively. The bulk damage threshold was observed as 85GW/cm² for single pulse of a Nd:YAG laser with 10ns pulse duration.

Keywords: YCOB, specific heat, thermal expansion, thermal conductivity, second-harmonic generation, laser damage threshold

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