Er3+: Y0.5Gd0.5VO4激光晶体的生长和热学性质

用提拉法生长出Er3 : Y0.5Gd0.5VO4单晶,用电感耦合等离子体(ICP)光谱法测定晶体中Er3 原子数分数为0.83%,有效分凝系数为1.03.在30～1300℃测量了晶体a轴和c轴的热膨胀系数分别为2.08×10-6/℃,8.87×10-6/℃;测得晶体在25℃时的比热值为0.48J/(g·K).采用激光脉冲法测量了晶体的热扩散系数,并通过计算得出晶体的热导率,在25～200℃温度范围,晶体在<100方向上的热导率为6.1～4.9W/(m·K),在<001方向上的热导率为7.7～6.2W/(m·K).

Growth and Thermal Properties of Er3+: Y0.5Gd0.5VO4 Laser Crystal

Er3+:Y0.5Gd0.5VO4 crystal has been grown by the Czochralski method. The effective separation coefficient of Er3+ in the crystal was 1.03 and the concentration of Er3+ ions in crystal is 0.83%, which was measured by the method of inductively coupled plasma (ICP) spectrum. The measured thermal expansion coefficients were αa=2.08×10- 6/℃, αc=8.87×10-6 /℃ from 30 ℃ to 1300 ℃ along its crystallographic a axis and c axis, respectively. The measured specific heat was 0.48 J/(g·K) at 25 ℃. The thermal diffusion coefficients of Er3+:Y0.5Gd0.5VO4 were measured by laser pulse method and the thermal conductivity was also calculated. The a axis and c axis thermal conductivity of Er3+:Y0.5Gd0.5VO4 was 6.1～4.9 W/(m·K), 7.7～6.2 W/(m·K) respectively in the temperature range from 25 ℃ to 200 ℃.