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arXiv 1509.09191physics.optics
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利用反射光的干涉可见度测量辐射相干性

Measurement of radiation coherence by means of interference visibility in the reflected light

E. A. Tikhonov, A. K. Lyamets

摘要:

提出、论证并测试了光束空间相干性的测量,其基于检测与从旋转平面平行板反射下出现的光束复制品的强度相等的干涉可见度。该方法包括在指定复制品的纵向路径差和横向位移同时变化时测量干涉对比度。精确测量旋转板的角度和干涉极小极大值的振幅分布可以确定光束空间相干性的宽度。用这种方法测量了几种多模激光器的空间相干性。关键词:相干测量,双光束干涉,旋转干涉仪

英文摘要:

Proposed, justified and tested measuring of beam spatial coherence, based on the detection of an interference visibility of the equal to intensity of beam replicas emerging under reflection from the rotated plane-parallel plate. The method consists in measuring the interference contrast at the simultaneous change of the longitudinal path difference and transverse shift of named replicas. Accurate measurement of the angle of rotated plate and the amplitude distribution of interferential minimaxes allows to determine the width of the beam spatial coherence. Spatial coherence of some types of multimode lasers has been measured by the method. Keywords: coherence measurements, interference in 2 move apart beam, rotable interferometer

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