光子晶体分为简单光子晶体和复式光子晶体，激光全息法是制作复式光子晶体的重要方法之一，光束偏振在其中扮演着重要角色。利用具有一定对称性的四光束配置干涉产生复式光子晶体，通过Matlab编程进行数值仿真，系统研究了不同偏振组合 (包括单光束、双光束、三光束和四光束) 对复式光子晶体元胞形状及干涉对比度的影响。结果表明，各光束的偏振度及旋转角度均对复式光子晶体具有显著影响。在不同偏振条件下获得了一系列丰富的元胞形状，如波浪条纹、椭圆柱、锯齿状等。此外，发现当各光束均为线偏振光时具有最佳的干涉对比度。上述研究结果对制作特殊元胞的复式光子晶体和虚拟实验教学具有一定的理论指导意义。

针对中物院高功率太赫兹自由电子激光（THz FEL）装置，结合FEL光腔振荡器实验的实际情况，提出了全波导近共心谐振腔设计方案。完成了THz波段波导光腔对光腔品质影响的理论分析和模拟计算，确定了波导设计尺寸为14 mm和22 mm。同时针对最初实验调试过程中无法出光饱和的问题，提出将波导更换为22 mm大尺寸波导的建议，波导更换后很快在2.56 THz获得饱和出光。另外针对实验频段无法覆盖到1～2 THz的问题，我们通过波导内壁粗糙度进行分析判断，提出采用14 mm铜材质的全波导FEL振荡器的设计方案，采用该方案后，实验成功将辐射频段拓展到0.7～4.2 THz，获得饱和输出。

Porous materials have many applications for laser–matter interaction experiments related to inertial confinement fusion. Obtaining new knowledge about the properties of the laser-produced plasma of porous media is a challenging task. In this work, we report, for the first time to the best of our knowledge, the time-dependent measurement of the reflected light of a terawatt laser pulse from the laser-produced plasma of low-Z foam material of overcritical density. The experiments have been performed with the ABC laser, with targets constituted by foam of overcritical density and by solid media of the same chemical composition. We implemented in the MULTI-FM code a model for the light reflection to reproduce and interpret the experimental results. Using the simulations together with the experimental results, we indicate a criterion for estimating the homogenization time of the laser-produced plasma, whose measurement is challenging with direct diagnostic techniques and still not achieved.

In high-power laser systems (HPLSs), understanding debris-removal trajectories is important in eliminating debris from the surfaces of transport mirrors online and keeping other optical components free from contamination. NS equations, the RNG k–" model and the discrete phase model of the Euler–Lagrange method are used to conduct numerical simulations on the trajectories of contaminant particles of different sizes and types on the mirror surface using Fluent commercial software. A useful device is fabricated based on the simulation results. This device can capture and collect debris from the mirror surface online. Consequently, the effect of debris contamination on other optical components is avoided, cleaning time is shortened, and ultimately, the cleanliness of the mirrors in HPLSs is ensured.