激光投影显示中复合散斑抑制方法的研究  

Analysis of composite speckle suppression technique in laser projection display

作　　者：黄艳 陈怀熹[2] HUANG Yan;CHEN Huaixi(College of Electronics and Information,Zhangzhou Institute of Technology,Zhangzhou 363000,China;Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China)

机构地区：[1]漳州职业技术学院电子信息学院,漳州363000 [2]中国科学院福建物质结构研究所,福州350002

出　　处：《激光技术》2024年第2期274-280,共7页Laser Technology

基　　金：福建省中青年教师教育科研项目(JAT201264);福建省教育科学“十四五”规划课题资助项目(FJJKGZ22-039)。

摘　　要：为了有效抑制激光投影显示中的散斑,基于散斑统计理论,建立了光纤长度与光纤末端出射光场衬比度的数值表达式;采用积分散斑统计学方法理论分析了级联位相片散射特性和运动特性对散斑衬比度的影响;实验研究了不同光纤长度下振动光纤前后图像的散斑衬比度;比较了运用散斑抑制技术和复合散斑抑制技术所获得的散斑图像衬比度。结果表明,采用振动10 m多模光纤与旋转级联位相片相结合的复合散斑抑制技术,可将散斑衬比度降低到3.76%;采用复合散斑抑制技术将增加系统自由度,从而更有效地抑制散斑。该研究为激光投影显示中开展复合散斑抑制技术研究工作提供了参考。In order to effectively suppress speckles in laser projection display,a numerical expression of the optical fiber length and the optical field contrast degree at the end of the optical fiber was established based on speckle statistical theory.Based on the integral scattering statistics method,the effect of scattering and moving properties of the multiple scatter diffuser on speckle contrast was analyzed.The experimental results show that the laser speckle contrast ratio can reduce 3.76%by using the composite speckle suppression technology combining a vibrating 10 m multimode fiber with a rotating cascade diffuser.Using composite speckle suppression technique can increase the system’s freedom,which contributes to speckle suppression.This study can provide a reference for the research work of composite speckle suppression technique in laser projection display.

关 键 词：激光技术 散斑衬比度 级联位相片 光纤振动 复合散斑抑制技术 

分 类 号：O436[机械工程—光学工程] TN249[理学—光学]