激光损伤1064nm增透熔石英的热应力数值模拟研究

研究并建立了激光损伤1064nm增透熔石英的理论模型,采用数值模拟方法计算了1064nm增透熔石英内部的瞬态温度场和应力场分布,分析了激光对1064nm增透熔石英的损伤机理。结果表明：激光对1064nm增透熔石英的损伤存在一定的累积效应,其效果使材料的损伤程度加剧,材料内部沿径向的温度梯度较大,沿轴向产生的温度梯度较小。在应力损伤中,环向应力起主要作用。1064nm增透熔石英发生损伤时,主要从激光作用中心点或光斑半径边缘附近开始。

Numerical Simulation Study on Thermal Stress Damage in 1064nm Anti-Reflection Fused Silica by Laser

In this paper,the theoretical model of thermal stress damage of 1064 nm anti-reflection fused silica is studied and established,the transient distributions of temperature field and thermal stress field are simulated by using the finite element method（FEM） and then the mechanism of the damage is analyzed.The main results show that there is a cumulative effect in the process of 1064 nm anti-reflection fused silica damaged by the laser and the material damage degree is increased.The radial temperature gradient is bigger and the axial temperature gradient is smaller in the fused silica internal.In thermal stress damage process which circumferential stress acts a primary role,1064 nm anti-reflection fused silica is damaged by the laser which often occurs at the action center or the edge near the spot radius.