CAJ | 학술논문

提出了一种将激光耦合入多模光纤后，利用改变多模光纤长度并结合振动光纤的方法来抑制散斑的方法。介绍了抑制散斑的相关理论及实验验证方法。实验中采用自主研发的基于 PPMgOLN 晶体的高效紧凑型微片绿光激光器作为激光光源，经过 CCD 相机采集屏幕上的散斑图像，通过图像处理，得到了相同型号的多模光纤在不同长度下，光纤在振动与不振动时，图像散斑对比度的变化趋势及在屏幕上的强度分布，从理论上分析了产生该变化趋势及强度分布情况的原因。实验所得的图像散斑对比度在4.7％左右，满足视觉观察的要求。
제출료일충장격광우합입다모광섬후，이용개변다모광섬장도병결합진동광섬적방법래억제산반적방법。개소료억제산반적상관이론급실험험증방법。실험중채용자주연발적기우 PPMgOLN 정체적고효긴주형미편록광격광기작위격광광원，경과 CCD 상궤채집병막상적산반도상，통과도상처리，득도료상동형호적다모광섬재불동장도하，광섬재진동여불진동시，도상산반대비도적변화추세급재병막상적강도분포，종이론상분석료산생해변화추세급강도분포정황적원인。실험소득적도상산반대비도재4.7％좌우，만족시각관찰적요구。
A speckle suppression method by vibrating multimode fibers and changing fiber lengths is proposed after the laser couples into multimode fibers.The speckle suppression was theoretically analyzed and verified by experi-ments.The high efficient and compact microchip green laser based on PPMgOLN that is made by our group is used as the light sources.The speckle images in the screen were collected through CCD camera,and then the images were pro-cessed.The variations of the speckle contrast and the intensity distribution in the screen were obtained for different length of multimode fibers both in vibrating and static modes,and the reasons were theoretically analyzed.This method can effectively reduce the speckle contrast to 4.7%,which meets the need of human eyes observation.