MATLAB近红外激光合束方法与光束质量检测
本文研究了激光非相干合束中光谱合束和空间合束的工作原理，设计了合束后激光光束质量检测方案。搭建实验系统，测试了合束前激光的功率及其透反射特性。为了检测合束激光的平行度或重合度，在合束激光出口的不同距离处放置CCD，采集合束前后激光光斑图像，利用均匀性度量法的MATLAB程序处理图像并计算得到阈值，对图像二值化处理后计算光斑灰度重心，通过对比合束前后激光光斑灰度重心的变化来评估合束质量。实验结果显示合束光斑基本重合，合束比较成功。
关键词 激光器 激光合束 合束质量 图像处理
毕业论文设计说明书外文摘要
Title Beam combining of near infrared laser method and beam quality detection
Abstract
High power fiber laser technology has made so great progress in recent years, and the continuous output power of a single one has over 10kW, but due to the physical mechanism, the output power of a single laser is still limited. Therefore, the beam combining of laser technology has become a focus and key research direction in the laser field.
The working principle of spectral beam combining and space beam combining which belong to the incoherent beam combining of laser are introduced in this paper, and design the laser beam quality detection scheme after beam combining.Set up the experimental system, test the power of the combined beams and the transmission and reflection characteristics. To test the parallel degree of combined laser beam or coincidence degree,place the CCD in the combined beam exports under the different distance.Acquire laser facula images before and after beams combining,
Use the MATLAB program of uniformity measurement method to deal with image and calculate the threshold, the gray center of gravity of light spot is calculated after image binarization processing , by comparing the change of gray center of gravity of laser facula before and after beam combining laser to evaluate beam quality. Experimental results show that the combined beam facula overlap, the beam combining is successful.
Keywords laser beam combining of laser combined beam quality the image processing
目 次
1 绪论 1
1.1 引言 1
1.2 研究现状 1
1.3 主要研究内容 3
2 工作原理与设计思路 5
2.1 激光合束原理 5
2.2 光束质量检测原理 6
3 激光光斑中心检测方法 8
3.1 激光光斑中心检测程序 8
3.2 方法可行性探讨与距离标定 13
4 实验结果与分析 16
4.1 合束前激光的功率测定 16
4.2 单束激光的透反射特性 20
4.3 合束激光束重合度测试 21
5 总结与展望31
5.1 总结31
5.2 展望32
结论 33
致谢 34
参考文献35
1 绪论
1.1 引言
近年来高功率激光器在技术上取得了巨大的飞跃和发展，单个激光器的输出功率已经达到万瓦量级，并且已经开始运用在激光毁伤和激光武器领域。激光武器是一种通过调整高能激光束的方向使其到达靶面目标从而实现定向毁伤的武器，也是目前激光应用领域中的关注焦点之一。研究和开发激光武器的过程涉及到一系列的光学学科和机械制造问题，激光武器对输出功率、作用距离和体积都有十分严格的要求，这对其激光器的系统内部光学设计提出了相当高的要求。近年来随着二极管泵浦技术的不断发展，以及激光器领域中双包层光纤的推广使用，光纤激光器的输出功率得到了很大程度的提高，将单个光纤激光器的输出功率提高到 20kW 在未来也很有可能实现，但单个激光器由于一些物理机制的限制，其输出功率还是受到限制。因此，激光合束技术成为近年来激光领域的关注热点和重点研究方向。