针对激光雷达探测中复杂目标姿态获取困难、目标与光斑真实耦合情况难获取等问题，提出了一种基于GPU编程的激光束照射复杂目标图像实时生成新方法。基于现代图形硬件的GPU编程技术和帧缓存对象特性，该算法以每个平面光源矩阵为观察者，在光源空间坐标系中渲染当前场景并将渲染结果记录到内存纹理中，然后在世界坐标中将光源观察到的结果复原和映射到模型上，可以实现实时映射渲染。采用深度缓存原理、纹理映射原理和OSG文件读写插件，即可正确获取模型每个三角面片顶点上的光源辐照度、顶点位置及面片法线等信息。经测试，该算法普适性强、能够读取多种格式三维文件，适应于均匀或非均匀面光源，对系统图形硬件的要求很低，能够满足两个面光源准实时性计算需求，可以准实时得到模型被照射面片所属部件、被照射三角面片顶点、法线信息以及三角面片顶点接收到的辐照强度值。该算法可为激光照明、识别探测等提供参考和依据。

新型激光光场成像系统受激光光束光强起伏影响成像像质下降，为抑制激光束光强扰动引起的像质退化效应，先对光场回波信号进行解调处理，再进行多光束相位闭合求解相位闭合系数，然后依据频谱迭代理论，推导建立基于光束光强扰动因子的频谱重建模型，揭示了光束光强扰动因子对光场成像频谱的影响机理。提出了一种基于激光回波光场信号解调比求解方法，抑制光强振幅扰动因子引起的频谱重建误差，间接提高光场重构成像像质，并采用多种像质评估方法进行像质评价。通过仿真和桌面实验平台对回波解调比方法进行了实验验证，结果表明解调比法抑制光强扰动后，重构图像斯特列尔比、峰值信噪比、结构相似度像质评价指标均得到有效提升。该方法可有效抑制光束光强抖动引起的像质退化效应并提高激光光场成像像质，可为光场成像技术像质提升和工程应用转化提供技术支撑。

We present a diode-pumped high-energy ceramic Nd:YAG planar waveguide that is demonstrated as a record in output energy for the ceramic planar waveguide fabricated by nonaqueous tape casting and solid-state reactive sintering. Under a repetition rate of 100 Hz and a pulse width of 250 μs, a maximum output pulse energy of 327 mJ is obtained with a beam quality factor of =2.6×7.0. The corresponding peak power is 1308 W. The extraction efficiency of the system is about 56%.

The chemical oxygen–iodine laser (COIL) is the shortest-wavelength high-power chemical laser that has been demonstrated. The characteristics, such as good atmospheric propagation, short wavelength and excellent transmission through optical fibers, make the COIL a good candidate for high-power laser application. To model the complete COIL lasing interaction, a three-dimensional formulation of the fluid dynamics, species continuity and radiation transport equations is necessary. The computational effort to calculate the flow field over the entire nozzle bank with a grid fine enough to resolve the injection holes is so large as to preclude doing the calculation. The approach to modeling chemical lasers then has been to reduce the complexity of the model to correspond to the available computational capability, adding details as computing power increased. The modeling of lasing in the COIL medium is proposed, which is coupling with the effects induced by transverse injection of secondary gases, non-equilibrium chemical reactions, nozzle tail flow and boundary layer. The coupled steady solutions of the fluid dynamics and optics in a COIL complex three-dimensional cavity flow field are obtained following the proposal. The modeling results show that these effects have some influence on the lasing properties. A feasible methodology and a theoretical tool are offered to predict the beam quality for large-scale COIL devices.