实验发现光学材料的损伤与激光波长、材料特性、激光脉宽等因素有关,而且光学材料损伤的最终态是不一样的,这个态可以是熔化、碎裂或蒸发。为了解释这些现象,从材料的热传导方程出发半定量地讨论了光学材料损伤机理,指出了一个关键参数决定了激光诱发损伤与激光脉宽τp的关系,它就是光学材料内的夹杂物把热量传递给光学材料体所需时间τ。在τpτ时,损伤阈值由激光辐射强度决定;在τpτ时,损伤阈值由激光辐射能量密度决定。 The experimental results show that the damage of optical material is related to laser wavelength, material properties, laser pulse width and other factors, and the final state of optical material damage is different, which can be melting, fragmentation or evaporation. In order to explain these phenomena, the mechanism of optical material damage is discussed semi-quantitatively from the heat conduction equation of the material. It is pointed out that one of the key parameters determines the relationship between the laser-induced damage and the laser pulse width τp. It is the inclusion of the optical material that transfers the heat The time required for the optical material body τ. At τpτ, the damage threshold is determined by the laser radiation intensity; at τpτ, the damage threshold is determined by the energy density of laser radiation.