diffraction spot

The difference between ideal diffraction pattern and that of actual measurement is considered and the actual diffraction pattern is studied on four aspects, such as white noise, characteristic of Gauss beam of LD,, spatial position and disturbance of thin cylinder and focal spot.

针对细圆柱体理想衍射花样和实测衍射花样的差异，从白噪声、光源的高斯特性、细圆柱体空间位置及外界扰动和焦点光斑等四个方面研究了实测衍射花样。

Primary parameters and living examples are given to show how to determine the parameter of optical system and make diffraction spot radius match detector size in laser heterodyne detecting system with both receiver and transmitter.

着重介绍了在收发合置式激光外差探测系统中，如何确定光学系统的参数，使成像的衍射斑与探测器尺寸匹配，并符合天线定理给出的条件，满足探测器混频的要求。

Traditional optical disc recording technology has limited storage density and low information transfer rate due to laser diffraction spot size limitation ( micron order of magnitude). A new type of 3-D storage technology is proposed in thesis.

本文基于传统的光盘记录技术因受激光衍射光斑极限的限制（微米数量级），存储密度有限，且其信息传输速率较低，故提出一种新型的三维存储技术。

An Imaging Processing Method for Measuring the Array Position of Diffraction Spot of High Power Laser Beam

测量高功率激光束衍射光斑阵列位置的图象处理方法

Then the diffraction spot size is decreased, and the optical resolution is increased, so the accuracy of the fine tracking system is improved.

由此减小接收衍射光斑的大小，提高系统的光学分辨能力，从而提高精跟踪系统的精确性。

We analyse the correlation image, present the way that removes liquid crystal diffraction spot, direct current spot and image noise, and binarize the correlation image finally.

提出了消除液晶衍射光斑、直流光斑和图像噪声的方法；最后对相关峰图像进行了二值化处理。

This paper describes two microcomputer programs of electron diffraction spot patterns.

本文介绍了两种电子衍射花样的微型机分析程序。

Analysis of Electron Diffraction Spot Patterns by Using Microcomputer

电子衍射花样的微型机分析