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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 conduction equation has made it difficult to study such issues as laser thermal damage. Stochastic simulation algorithm regards heat transfer as a stochastic chemical kinetic process, and the algorithm is easy to implement and is suitable for the simulation of complex systems with time. Taking solid silicon as an example, the heat transfer process of Gaussian laser irradiated silicon surface was calculated by this algorithm. Compared with the traditional calculation method, this algorithm was used to discuss the influence of absorption coefficient on thermal damage. The calculation results show that the simulation results accord with the actual laws of laser irradiated solid materials and can be used as a research method of laser heat transfer process. The results show that the thermal damage of the material depends on the wavelength in the initial stage of laser irradiation, and the material with smaller absorption coefficient can reduce the probability of thermal damage to the substrate. In the late stage of laser irradiation, the effect of reducing the absorption coefficient on the thermal damage is not obvious.