光学专业毕业设计：激光光斑尺寸测量和研究

激光光斑尺寸的测量和研究

摘要

激光光斑尺寸是标志激光器性能的重要参数，也是激光器在应用中的重要参量。

本文主要介绍了两种测量激光光斑尺寸的方法：刀口扫描法，CCD 法。分析了利用刀口法测量高斯光束腰斑大小的测量实验装置，并阐述了具体的测量过程。此方法对激光光斑大小测量是可行的。实验装置简单实用。CCD法是利用CCD作为探测传感器，可以更精确地测出激光器的光斑尺寸和束腰光斑尺寸，克服了传统测量的繁杂过程，并用计算机控制及数据处理，测量精度得到提高，为激光器性能研究和光信息处理提供了一种新的方法。本文给出了这两种方法测得的数据及处理结果。

结果表明，刀口扫描法对高能量光束半径的测量特别实用，装置简单，可在普通实验室进行测量。CCD法检测的直观性好，不需要辅助的逐行扫描机械移动，成像精度和检测精度高。

关键词激光光斑尺寸；Matlab；CCD 传感器；刀口法

The Measurement and Research of Laser

Spot Size

Abstract

The size of Laser spot is not only one important parameter of laser performance, but also in laser application.

This paper introduces two methods of measuring laser spot diameter: scanning method, CCD: knife method. We analyze of measurement is cut the size of the gaussian beam waist measurement device spot, and elaborates on process of the measurement. Using this method of laser spot size measurement is feasible. The experiment device is simple and practical. CCD method uses the CCD sensor as a detection can be more accurate to measure the size of the laser spot and waist size spot, overcoming traditional measurement process and using computer control to deal with data processing, and the measurement accuracy is improved, providing a new method for laser performance study and light information processing. At the same time, it gives two methods of measured data and processing results.

The results show that the method of blade scanning is practical for high-energy beams radius’s measurement. Simple device can be operated in ordinary laboratory. CCD detection method is visually good, and do not need to manufacture progress ive-scan

auxiliary of the machine movement, the imaging accuracy and precision is the higher

Keywords Laser spot size; Matlab; CCD sensor; knife-edge method.

目录

摘要 .......................................................................................................... I Abstract .................................................................................................. II 第1章绪论 (1)

1.1 课题背景 (1)

1.2 国外研究现状 (2)

1.3 论文研究的容 (4)

第2章激光光斑测量方法探究 (5)

2.1 刀口扫描法测激光光斑直径研究 (5)

2.2 CCD测激光光斑直径方法 (9)

2.3 本章小结 (17)

第3章激光光斑尺寸的测量与数据分析 (18)

3.1 刀口法测光斑直径 (18)

3.1.1 90/10刀口法理论及方法 (18)

3.1.2 计算理论 (20)

3.1.3 实验数据处理 (20)

3.1.4 实验分析 (22)

3.2 CCD法测激光光斑方法 (22)

3.2.1 用CCD拍摄光斑图像 (22)

3.2.2 Matlab的图片处理 (23)

3.2.3 图像处理结果 (23)

3.2.4 实验分析 (26)

3.3 本章小结 (27)

结论 (28)

致 (29)

参考文献 (30)

附录A 英文原文 (31)

附录B 中文译文 (35)

附录C Matlab程序 (39)