基于随机模拟算法的激光辐照固体材料的温升研究

Study on temperature rise of laser-solid material irradiation by stochastic simulation algorithm

热传导方程的复杂性给研究激光热损伤等问题带来了困难。随机模拟算法将热传输看成是随机的化学动力学过程,算法容易实现,适用于复杂系统随时间变化的模拟。以固体硅为例,利用该算法计算了高斯激光辐照硅表层的热传输过程,对比了传统计算方法,应用该算法探讨了吸收系数对热损伤的影响问题。计算结果表明,算法的模拟结果符合激光辐照固体材料的实际规律,可作为一种激光辐照固体热传输过程的研究方法。应用结果显示:激光辐照初期,材料的热损伤与波长有依赖关系,吸收系数较小的材料能减小对基底的热损伤概率;激光辐照后期,减小吸收系数对热损伤的影响不明显。

The complexity of the heat exchange equation brings difficulties to study laser-damage etc.A kind of stochastic simulation algorithm（SSA）which treats the energy input and redistribution process as a chemical kinetics problem is used.The complex system is easy to simulate.Temperature distribution of Gauss laser-silicon irradiation is studied by stochastic simulation.The simulation result is compared with the traditional calculation method.The results show that the stochastic method is reasonable to treat heat exchange,and stochastic simulation algorithm is useful to study Gauss laser-solid material irradiation.The beginning of laser irradiation,laser-damage is relations with wavelength,and low absorption coefficient can reduce damage probability of basement,but the late of laser irradiation,laser-damage is not obvious to reduce the absorption coefficient.