基于数拍瓦装置的光路准直控制技术与图像处理研究
文献类型：学位论文
| 作者 | 张嘉琛 |
| 文献子类 | 硕士 |
| 导师 | 刘代中 |
| 关键词 | 高功率激光 high power laser 准直 alignment 图像处理 image processing 自动控制 automatic control 非共线角 non-collinear angle |
| 其他题名 | Research on Beam Alignment Control Technique and Image Processing Based on MPW |
| 英文摘要 | 自动准直技术在高功率激光装置不断发展的过程中应运而生。高功率激光驱动器自动准直系统的目标是利用计算机、步进电机、光学采样系统、CCD摄像机等组成的闭环监视控制系统和光路中设置的光束近、远场基准和探测点，快速、准确地完成装置全系统光路的自动调整，确保从振荡器输出的激光光束能够稳定、精确地穿过预放大器、主放大器、终端光学组件，并准确地照射到微型靶丸上。数拍瓦装置（MPW）的结构复杂，光束口径大、光路元件多、光路长度长，这些都对光路的调整提出了更高的挑战。 本学位论文致力于基于数拍瓦装置的光路准直控制技术与图像处理研究，主要目的是为系统在硬件和软件方面的设计和优化提供可靠、实用的理论依据和技术支持。通过本论文的研究工作，基本掌握了高功率激光装置自动准直系统的理论内容。本论文的主要研究成果如下： 1）首次将基于远场采样的大口径光束准直系统应用于数拍瓦装置中，取代需要使用大口径成像透镜的传统光束准直系统，以满足数拍瓦装置对准直系统空间尺寸的要求。 2）基于光栅采样技术，开发了一套兼具远场准直和晶体准直功能的远场监测系统，取代了传统两套独立的远场准直系统和晶体准直系统。共用一套光学元件不但减少了远场准直和晶体准直系统的空间排布尺寸，还大大地降低了装置的成本。 3）设计了OPCPAⅡ非共线角的在线准直监测系统，利用CCD同时监测信号光和泵浦光的远场对LBO晶体的非共线角进行监测与控制，有效地解决了大能量OPCPA放大环节中的非共线角监控的技术难题，为数拍瓦装置提供理论依据与技术支撑。 4）成功将数字图像算法中的自适应阈值法应用到OPCPAⅡ远场指向双光斑图像处理当中，取代了固定阈值法，以满足系统对双光斑中心进行定位的要求。 5）开发了衰减片自动切换装置，成功将其应用于实验平台上，取代了原先手动切换衰减片的做法，提高了装置运行效率和远程控制能力。 6）开发了双光斑图像处理、目标IP设置、步进电机设置的人机界面，方便对数拍瓦装置准直系统进行操作和管理。; Automatic alignment technique emerges as the development of high power laser facility. The main purpose of automatic alignment system in the high power laser driver is to quickly and accurately achieve the automatic adjustment of the all light path in the facility with the help of the closed loop monitoring control system and the points that set in the light path. The closed loop monitoring control system consists of computer, stepper motors, optical sampling system, CCD camera, and so on. The points consist of near-field and far-field references of the beam, as well as the detection point. The automatic alignment system can make sure the beam stably and precisely passing through the pre-amplifier, the main amplifier, the final optics, finally accurately focusing on the tiny pellet. The structure of Multi-Petawatt Facility (MPW) is complex, which owns lager beam aperture, a lot of optical components, long light path. These pose a higher challenge to adjust the laser light path. This dissertation is devoted to research on the beam alignment control technique and image processing based on MPW. The main purpose of this study is to provide reliable and practical theoretical basis and technical support for designing and optimizing the hardware and software of MPW. The theoretical knowledge of automatic alignment system in high power laser facility is basically mastered through the research work of this dissertation. The main research results of this dissertation are as follows: 1)The large-aperture laser beam alignment system based on far-field sampling technique is first time to be applied in MPW. The proposed alignment system replaces the traditional laser beam alignment system that needs large-aperture imaging lens to satisfy the requirement of space size for alignment system. 2)The far-field detection system that can achieve the two functions of far-field laser beam and crystal alignment is developed based on grating sampling technique. The proposed detection system replaces the traditional two systems that separate for far-field laser beam system and crystal alignment system. Sharing a common optics can not only decrease the space arrangement size of far-field laser beam and crystal alignment system, but also greatly reduce the cost of the facility. 3)The on-line alignment detection system of non-collinear angle in OPCPAⅡ is designed. The non-collinear angle of LBO crystal is detected and controlled through CCD simultaneously detecting the far-field of signal light and pump light. It can effectively solve the technological problem of detection and control for non-collinear angle in the process of big energy OPCPA amplification. And it provides the theoretical foundation and technical support for MPW. 4)The self-adaptive threshold method of the digital image algorithm is successfully applied to the double spot image processing of OPCPAⅡ far-field. The self-adaptive threshold method replaces the fix threshold method in order to satisfy the requirement of double spot center location for the system. 5)The automatic switching device for attenuation is developed, which is successfully applied to the experimental platform. The proposed automatic switching device takes the place of manual switching method, which improves the operating efficiency and the remote control ability of the facility. 6)The human-computer interfaces for image processing of double spot, target IP setting, stepper motor setting are developed, which are convenient to operate and manage the alignment system in MPW. |
| 学科主题 | 光学工程 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/30981]  |
| 专题 | 中国科学院上海光学精密机械研究所 |
| 作者单位 | 中国科学院上海光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | 张嘉琛. 基于数拍瓦装置的光路准直控制技术与图像处理研究[D]. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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