利用边缘光线原理设计了基于非成像反射腔的棒状放大器，采用相同氙灯放电参数和钕玻璃棒尺寸，数值模拟了成像和非成像两种不同反射腔作用下放大器钕玻璃棒的储能密度，并实验研究了小信号增益系数，模拟和实验结果吻合度较高。非成像反射腔具有特殊光学结构，能够反射全部抽运光至钕玻璃棒表面，从而提升光电转换效率，减少废热产生，提高抽运效率和放大器增益性能，使放大器更加高效、经济。

针对非成像抽运方式，研究最大理论耦合效率下的抽运腔结构。采用边缘光线原理和定绳法设计了多灯非成像抽运腔，根据放大器的结构差异，设计了两种计算模型。在相同抽运能量下，对非成像抽运腔和成像椭圆腔中钕玻璃棒表面辐照度进行了数值模拟，结果表明,椭圆抽运腔的辐射光线存在氙灯的自吸收和氙灯相互间吸收的现象，影响了放大器的增益性能。非成像抽运腔的反射壁消除了氙灯自吸收，且减少了光线反射次数。因此，非成像抽运腔能够实现最大耦合效率和最佳的抽运均匀性。

According to the problem of gain medium cross section high illumination and non-uniformity, which is caused by the laser rod amplifier non-imaging pump style. Orthogonal test design method is used to research the effect of absorption coefficient, gain medium radius, number of xenon lamps, center distance of xenon lamps and gain medium on gain uniformity. The rod amplifier which is made up by the above four elements, its gain medium cross section illumination distribution is simulated by ASAP. The results show that center distance of xenon lamps and gain medium, number of xenon lamps have very little influence on the gain uniformity. When absorption coefficient equal to 5.1 cm-1, gain uniformity will reach the optimum. Under the circumstance of other three elements are equal, the bigger is the gain radius, the smaller slope reflection curve, and the better gain uniformity.

According to the non-imaging pump style, pump cavity structure with the theoretical maximum coupling efficiency is researched. Multi-lamp non-imaging pump cavities are designed by edge-ray principle and constant string length method. Two calculation models are obtained through the difference of amplifier structures. The Nd∶glass surfaces illumination in the non-imaging and elliptical imaging pump cavity are simulated with the same pump energy. Results show that there are lamp self-absorption and mutualabsorption in the elliptical imaging pump cavity, which affects amplifier′s gain property. To non-imaging pump cavity, the reflector profile avoids light reflecting back to the lamp and reduces the number of reflections. Thus, non-imaging pump cavity can lead to the maximum coupling efficiency and the best pump uniformity.

By using N-S equations, RNG κ-ε model and discrete phase model of Euler-Lagrange method, numerical simulations on the removal trajectories of contaminant particles of different sizes and types on the mirror surface are conducted with the commercial software Fluent. Benefiting from the simulation results, a useful device which can capture and collect debris from the mirror surface online is built. Ultimately the efficiency of cleaning and cleanliness of transport mirrors are improved. And to some extent, the chances that contaminant particles go into the surrounding environment and further pollute other optical components are reduced.

Understanding the radiation model of a flash lamp is essential for the reflector design of a laser amplifier. Reflector design often involves several simplifying assumptions, like a point or Lambertian source; either of these assumptions may lead to significant errors in the output distribution. In practice, source non-idealities usually result in sacrificing the amplifier’s gain coefficient. We propose a novel test technique for attaining the xenon flash lamp absolute spectral intensity at various angles of view, and then accurately predict radiation distributions and generate the reflector shape. It is shown that due to the absorption of emitted radiation by the lamp itself, the behavior of the radiation model at various wavelengths is different. Numerical results of xenon plasma absorption coefficient were compared with the measured data. A reasonable agreement was obtained for the absorption coefficient parameters. Thus, this work provides a useful analytical tool for the engineering design of laser amplifier reflectors using xenon flash lamps as pumps.

利用计算流体动力学（CFD）技术，对有机污染物在空间滤波器内的扩散情况进行了数值模拟，得到了在不同洁净控制设计方案下，有机污染物物在空间滤波器真空系统中随扩散时间的浓度分布情况，而后在优选设计的基础上对模型进一步优化，最终减少了有机污染物对空间滤波器内光学元器件的污染，对于实现高功率激光装置的高效、精密运行具有重要意义。

利用Fluent软件，以N-S方程和RNG κ-ε 模型为基础，采用离散相模型,对风刀吹扫去除传输镜表面颗粒物污染物的流场，以及吹扫去除过程中颗粒物的运动轨迹进行了模拟，并基于模拟仿真结果搭建了颗粒物污染捕捉和收集的装置，最终提高了传输镜表面污染物的清除效率和洁净度，并且在一定程度上避免了吹扫过程中污染物颗粒进入周围环境以造成对其他光学元器件的污染。

Graphene saturable absorber (SA) is used as the passive Q-switcher of a 0.9-\mu m solid-state laser. When the laser medium is a Nd:La0.11Y0.89VO4 crystal, the initial transmittance of the graphene SA is 78%; at an absorbed pump power of 7.62 W, the maximum average output power, largest pulse energy, and minimum pulse width are 0.62 W, 2.58 μJ, and 84 ns, respectively. This study shows that graphene is a promising and cost-saving SA for 0.9-\mu m pulse generation.