基于印压断裂力学理论分析了磷酸二氢钾晶体表面缺陷面积与中位裂纹深度的关系.在刀具参量和主轴转数一定的情况下, 采用不同切削深度和进给速率对磷酸二氢钾晶体进行单点金刚石飞切加工实验, 并计算晶体表面单位面积缺陷的占比系数.实验结果表明, 晶体表面缺陷深度与面积占比系数成正相关, 与理论分析结果相符, 进而提出了利用计算晶体表面缺陷占比系数估测缺陷深度的方法.最后基于该方法得到高效率切削步骤, 并加工获得了表面粗糙度算术平均值优于5 nm的超光滑晶体表面.

Based on the vibration theory and the matrix optics theory, the principle of the optical image method to test the beam positioning stability is derived. The test method of beam positioning stability is designed, and the experimental results show that the optical image method can accurately analyze the range of the beam positioning stability error, also can analyze the value and influence degree of vibration frequency of the error, and combined with the accelerometer by the electron test method, the source of the error can be detected in the optical system. The optical-electro test method is reliable, simple and convenient, and has good engineering application value, especially for large optical system.

从振动的基本理论出发,应用矩阵光学理论,推导了光学图像法测试光束指向稳定性的原理。设计了光电法测试光束指向稳定性的测试应用,并搭建了实验光路,结果表明:光学图像法可以准确分析光束指向稳定性误差的大小、产生的误差的振动频率及其影响程度,并结合加速度计的电学法测试,可以探测光路中引起光束指向误差的来源。光电法测试结果正确可靠、简单方便,具有较好的工程应用价值,特别适合大型光学系统的光束指向稳定性测试。

研究了动力吸振器中库仑阻尼(干摩擦)对吸振性能的影响。给出了库仑摩擦模型, 在考虑了吸振器中的库仑阻尼的情况下, 分析了库仑阻尼引起的主振动系统与附加质量块的2种相对运动状态(滑移和粘滞)以及它们存在和转换的条件, 讨论了因库仑阻尼引起的吸振器自由度冻结现象;用Simulink仿真工具对非线性吸振器进行了数值仿真, 研究了谐波和白噪声激励下库仑阻尼对吸振器吸振性能的影响以及库仑阻尼与线性阻尼的等效问题。结果显示：弱激励条件下, 非线性吸振器减弱吸振效果,强激励条件下增强吸振效果。

从提高结构稳定性的基本理论出发,利用有限元方法研究了靶场桁架结构稳定性。结果表明:影响大口径反射镜动态稳定性的主要因素为靶场桁架的第三阶模态振型,其薄弱环节为支撑立柱;通过在支撑立柱间增加横向加强筋、桁架立柱采用钢管混凝土结构等措施可有效提高桁架的结构稳定性;立柱截面最小方形空心型钢的尺寸为300 mm×6 mm。给出的靶场桁架的稳定性设计方案满足大口径反射镜的动态稳定性指标。

从提高结构稳定性的基本理论出发, 给出了神光Ⅱ升级惯性约束聚变(ICF)靶室系统的初始结构方案, 并利用有限元方法(FMM)对其进行模态分析, 找出靶室系统初始结构的薄弱环节, 进而对初始方案进行结构稳定性优化, 最后对优化方案进行稳定性分析。优化与分析结果表明, 当靶室的壁厚T为50 mm, 靶室支脚与垂直方向夹角θ为27.2°, 支脚之间布置厚度B为20 mm筋板, 筋板空间距离H为120 mm时, 靶室系统可以获得很好的稳定性, 随机激励作用下的平移均方根值为1.425 μm, 满足神光Ⅱ升级装置对靶室系统的稳定性指标。

考虑到空间滤波器系统在激光装置中的稳定性要求,分析了影响稳定性的各种因素.对现行装置中的SF4空间滤波器系统进行振动模态测试,初步确定系统的工作状况,并结合振动理论明确系统稳定性的设计参数.利用有限元软件ANSYS对空间滤波器系统及相关的设计进行仿真验证计算.结果表明:SF4系统的一阶固有频率达到83 Hz,与实验结果相符合,满足系统稳定性的要求;在系统中引入支撑不但能有效增加系统的刚度,同时能转移系统的振型;系统基础支撑平台的选择要求平台独立,并且选择较低的高度以便于控制上层光学元件的变形;在系统中的引入波纹管这种弹性连接,能降低系统变形量,并且通过改变波纹管的厚度能实现连接刚度的改变.上述设计可在神光装置其它系统结构中应用.

Structural design and stability analysis of 'phi' 570 mm mirror mount are performed. Under the constraint conditions, the geometric parameters of cross-flexure pivot in large aperture mirror mount are determined. With finite element analysis software (ANSYS), the influences of cross-flexure pivot's setting angle on center drifting and stress distribution of flexure, and the dynamic performance of the whole mirror mount, are analyzed. When the setting angle between the direction of gravity and the setting direction of flexure is 0 or 90 deg., the center drifting of mirror mount is minimum and the stress distribution of flexure is relatively uniform. The nature frequency is 23 Hz, and the maximum amplitude of angular vibration response to random excitation input is 0.91 microrad, which is consonant with experiment results. The performance of mirror mount can satisfy the requirement of precision positioning in Shenguang (SG) II laser system.

A novel method of error analysis for opto-mechanical system by considering issues of the space and time stability is proposed. According to the theory of error transfer model and the system stability requirements, the temporal parameter is introduced as the dynamic compensate to reflect the structure random response influencing the position precision in the period of working time. The error transfer model originated from our method is also put forward. Moreover, the simulation is used to analyze the error of spatial filter system in Shenguang (SG) II facility. The results show that the method can more effectively deal with the target position error induced by the system structure, and it also provides a dynamic error analysis method for the high power laser facility and other great science projects.