光束扫描电视显示器及其技术基础

在早期开发的激光电视的基础上,提出了光束扫描电视显示的方案,并初步探讨了为实现该方案所涉及的技术问题。

Speckle analysis in laser scanning display system

The theory of speckle formation in laser scanning display system is established based on the averaging effect of eye response as laser beam scanning through an eye resolution spot. It is analyzed that speckle reduction can be obtained by averaging states of speckle during scanning. The theoretical results show that a smaller correlation length of screen surface and the narrowing of laser beam in scanning direction can reduce speckle contrast for this system.

激光法测量滤棒和烟支圆周的原理及误差分析

卷烟产品的滤棒和烟支的圆周误差会直接影响成品卷烟的接嘴质量和原辅材料的消耗,所以滤棒和烟支的圆周是一个必须要测量和控制的重要指标。目前测量滤棒和烟支圆周的主要方法是激光法,本文对激光法的测量原理及测量过程进行了阐述,并从校准时标准棒与激光束扫描平面的位置关系、测量时样品与激光束扫描平面的位置关系、激光透过样品的情况、样品的圆度、激光传递路径上各光学器件的干净程度等五个方面对产生测量误差的原因进行了分析,提出了相应的解决办法。

Precise measurement of the micron-scale spot of ultrashort laser pulse based on film scanning

A novel and precise micron-scale nanosecond laser spot measurement based on film-scanning method is presented. The method can be used to measure the spot size, beam profile, and intensity distribution of the pulse. The central spot radius of the pulsed Bessel beams with pulse width of 25 ns is measured to be 94.86 ± 5 μm in our experiment through the analysis of the digital image by film scanning, and the result is consistent with the theoretical value of 92.33 μm. Compared with charge-coupled device/complementary metal oxide semiconductor （CCD/CMOS） laser beam profilers, the film-scanning method shows higher measurement accuracy, single shot ultrashort pulse measurable, larger measurable size, and wider measurable wavelength range.

基于液晶相控阵和体全息光栅的激光多目标指示技术

为解决现今激光制导武器指示器指示效率低下、单次指示集群目标能力差等问题,从光束偏转控制和光束角度放大技术的原理出发,以液晶相控阵和多路复用体全息光栅为控件,设计了可用于多目标指示的大角度激光光束偏转控制系统;分析了影响液晶相控阵光束偏转特性的参数的选取规则,确定了大角度光束偏转系统的设计方法,模拟了激光多目标指示系统的指示过程,并对系统误差来源和误差修正方法进行了理论分析和仿真。结果表明:该系统可以快速地对光束实现最大偏转角度为15.63°的二维准连续、可编程控制的偏转;误差修正方法可有效提高激光光束的指示精度,使误差角度下降50%左右。所提出的激光多目标指示系统的设想,可实现对二维平面内多目标的准连续、准同时的精确指示,可为激光多目标指示器的设计提供参考。