Temperature dependence of elastic modulus of single crystal sapphire investigated by laser ultrasonic
激光超声技术测量高温下蓝宝石单晶的弹性模量

The longitudinal ultrasonic wave launched by ns-laser pulse is used to measure the temperature dependence of the elastic modulus C33 of single crystal sapphire.The result shows that in a temperature from room temperature to 1000°C the elastic modulus of sapphire C33 reduces as the temperature increases,following the relationship C33 =-1.541 x 10(-50T2 - 0.021T + 498.3.In this method,the ablation mechanism is adopted to launch strong longitudinal waves,therefore,the result is accurate that the error of the measurement is estimated to be no more than 0.1%.