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arXiv 2401.08362physics.optics
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用于空间相干性测量的改进型马赫-曾德尔干涉仪

Modified Mach Zehnder interferometer for spatial coherence measurement

FJ Torcal-Milla, J Lobera, EM Roche, AM Lopez, V Palero, N Andres, P Arroyo

AI总结:

本文提出一种含透镜对的改进型马赫-曾德尔干涉仪,可无移动部件地同时测量激光束任意两点的空间相干长度,并通过双腔高速激光实验揭示复相干度随输出能量变化,为干涉应用确定最佳激光配置。

摘要:

光源的空间相干性通常通过经典的杨氏干涉仪获得。尽管原始实验在后续工作中得到了改进,但仍存在一些不足。此外,必须使用多对点才能完整表征光源的二维复相干度。本文提出了一种基于改进型马赫-曾德尔干涉仪的替代方案,该干涉仪包含一对透镜。借助这种改进型马赫-曾德尔干涉仪,我们能够同时测量激光束截面上任意两点之间的空间相干长度。该装置没有任何可移动部件,因此坚固且便携。为了对其进行测试,测量了具有两个腔体的高速激光器在不同脉冲能量值下的二维空间相干性。我们从实验测量中观察到,复相干度随所选输出能量的变化而变化。在最大能量下,两个激光腔似乎具有相似的复相干度,尽管并不对称。因此,该分析将使我们能够确定双腔激光器在干涉测量应用中的最佳配置。此外,所提出的方法可应用于任何其他光源。

英文摘要:

Spatial coherence of light sources is usually obtained by using the classical Youngs interferometer. Despite the original experiment has been improved in successive works, some drawbacks still remain. In addition, several pairs of points must be used to characterize the totally the 2D complex-coherence degree of the source. In this work, an alternative based on a modified Mach-Zehnder interferometer which includes a pair of lenses is presented. With this modified Mach-Zehnder interferometer, we are able to measure the spatial coherence length between any two points of the laser beam section simultaneously. The set-up does not have any movable part, which makes it robust and portable. To test it, the two-dimensional spatial coherence of a high-speed laser with two cavities has been measured for different pulse energy values. We observe from the experimental measurements that the complex degree of coherence changes with the selected output energy. Both laser cavities seem to have similar complex coherence degree for maximum energy although it is not symmetrical. Thus, this analysis will allow us to determine the best configuration of the double cavity laser for interferometric applications. Furthermore, the proposed approach can be applied to any other light sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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