摘要
在高功率激光的诱导下,光学薄膜元件吸收激光能量从而使能量聚积继而产生热能,导致薄膜内的温度急剧升高。局部温度上升使得薄膜内部产生热应力。热和力的相互转化、相互作用最终导致薄膜层的熔化、破裂等破坏。从热力学理论出发,建立了单层薄膜内部温度场模型,利用积分变换法求解并获得了温度场数值分布,用Matlab对温度场的分布进行了仿真,得到薄膜任意时刻在厚度方向及半径方向的温度分布。结果表明,所获得的数值解准确反映了激光诱导光学薄膜所造成的温度效应,为薄膜设计与制备以及激光薄膜损伤识别研究提供了理论基础和依据。
Under the action of high-power laser,the optical thin film device absorbs laser energy to accumulate energy and then generate thermal energy,causing the temperature in the thin film to increase sharply.Local temperature rise causes thermal stress inside the film.Mutual transformation of heat and force,the interaction eventually leads to the thin layer of melting,cracking and other damage.Based on the theory of thermodynamics,a model of the internal temperature field of a single-layer thin film is established.The temperature field distribution is solved by the integral transformation method.The distribution of the temperature field is simulated by Matlab.The temperature distribution in the thickness direction and radial direction of the film at any time is obtained.The numerical results show that the obtained numerical solution accurately reflects the temperature effect caused by the laser-induced optical thin film,which provides a theoretical basis and basis for the research on thin-film design and fabrication and laser thin-film damage identification.
出处
《光学与光电技术》
2018年第1期32-38,共7页
Optics & Optoelectronic Technology
基金
国家自然科学基金(51378050)
陕西省科技计划(2016kw-036)资助项目
关键词
高功率激光
光学薄膜
温度场
仿真
数值方法
high-power laser
optical thin film
temperature field
simulation
numerical method
