Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
Opt Lett. 2010 Mar 15;35(6):889-91. doi: 10.1364/OL.35.000889.
In this work we implement a Mach-Zehnder interferometer with an image rotator in one of its arms to measure the orbital angular momentum (OAM) spectrum of a partially coherent beam. By measuring the visibility of the interference as a function of the angle of rotation, the OAM distribution can be recovered via a Fourier transform. Theoretical calculations based on the coherent mode decomposition of the cross-spectral density are in excellent agreement with the experimental data.
在这项工作中，我们在马赫-曾德尔干涉仪的一个臂中实现了一个像旋转器，以测量部分相干光束的轨道角动量（OAM）谱。通过测量旋转角度作为干涉可见度的函数，OAM 分布可以通过傅里叶变换恢复。基于交叉光谱密度的相干模式分解的理论计算与实验数据非常吻合。
