研究了白宝石(〈0001〉切割)晶体在800nm ns、ps和fs激光脉冲作用下的损伤形态．实验发现，在纳秒脉冲作用下，损伤外型与晶体的结构参量一致，呈“米”字形；在皮秒激光脉冲作用下，损伤外型呈“十”字形；而在飞秒激光脉冲作用下，损伤外形呈“一”字形；说明白宝石晶体结构损伤与应力作用下晶体缺陷的择优取向有关．

The damage threshold and morphology of sapphire crystal〈0001〉 have been investigated by nanosecond(ns),picosecond(ps),and femtosecond(fs) laser pulse at 800 nm based on the mechanical,thermal,and photon-electrical properties of sapphire crystal. The star-like crack which is associated with the point group of sapphire crystal is induced by ns laser pulse,and the cross crack induced by ps and linelike crack by fs laser pulse may be relation to the preferred dislocation from anisotropic stain tensor.