论文部分内容阅读
为了研究大功率CO_2激光发射过程中输出窗口吸收激光能量产生热性能变化的问题,建立了输出窗口传热学和结构力学耦合非稳态模型,通过对模型进行有限元分析得到表征输出窗口变化的温度、热变形和热应力等参数分布。首先,针对大功率CO_2激光特点,讨论了输出窗口材料Ga As和Zn Se的物理特性。然后,基于10 k W级大功率CO_2激光器光学谐振腔结构和输出窗口材料物理特性,建立了输出窗口传热学和结构力学的有限元模型。最后,利用COMSOL软件对该模型进行求解,得到以Ga As和Zn Se为材料的输出窗口的温度、热变形和热应力等参数分布,并对比分析不同窗口材料对参数的影响。研究表明:在10 k W级激光作用下,Zn Se窗口温升小于Ga As窗口;两种输出窗口产生μm量级热变形;由于Ga As材料的热导率高,Ga As窗口的热变形和热应力分布更为均匀。
In order to study the thermal performance change of the output laser energy in the output window during the process of high power CO 2 laser emission, a coupled unsteady model of heat transfer and structural mechanics of output window was established. The output window was characterized by finite element analysis Temperature, thermal deformation and thermal stress and other parameters. First of all, in view of the characteristics of high-power CO_2 laser, the physical properties of GaAs and ZnSe as output window materials are discussed. Then, based on the structure of the 10 kw high power CO_2 laser resonator and the physical properties of the output window, a finite element model of heat transfer and structural mechanics of the output window was established. Finally, the COMSOL software was used to solve the model, and the parameters such as temperature, thermal deformation and thermal stress of the output window with Ga As and Zn Se were obtained. The influence of different window materials on the parameters was analyzed. The results show that the temperature rise of the Zn Se window is less than that of the Ga As window at 10 k W level laser; the thermal deformation of the two output windows is in the order of μm; due to the high thermal conductivity of the GaAs material, Thermal stress distribution more uniform.