Transferring linear motion of an optical wedge to rotational frequency shift in an orbital angular momentum interferometer
Transferring linear motion of an optical wedge to rotational frequency shift in an orbital angular momentum interferometer
复制标题
将光楔的线性运动转换为轨道角动量干涉仪中的旋转频移
DOI：
10.1063/1.4995366
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发表时间：
2017
影响因子：
4
通讯作者：
Chen Lixiang
中科院分区：
文献类型：
--
作者：
Jia Qikun;Qiu Xiaodong;Wu Ziwen;Zhang Wuhong;Chen Lixiang
我们构建了一种改进的马赫-曾德 (M-Z) 干涉仪，其一个臂中嵌入了道威棱镜，用于观察两个共轭轨道角动量 (OAM) 光束之间的干涉。通过在另一臂中垂直插入并移动光楔，我们发现其线性运动可以等效地引起旋转频移，这是两个 OAM 光束之间从路径差到方位角差的相位转移的结果。楔块的微米级运动由紧凑的电动平移台驱动，并通过干涉花瓣状图案的显着旋转来体现。我们的方案提供了一种通过简单的数字图像处理方法来测量光楔角的精确方法。这项工作还可能在速度传感或温度传感领域找到潜在的应用。
We build a modified Mach-Zehnder (M-Z) interferometer with an embedded Dove prism in one arm to observe the interference between two conjugate orbital angular momentum (OAM) beams. By inserting and moving an optical wedge vertically in the other arm, we find that its linear motion can induce a rotational frequency shift equivalently, as a consequence of phase transfer from the path difference to the azimuthal difference between two OAM beams. The micron-scale movement of the wedge is driven by a compact motorized translation stage and is manifested by a significant rotation of the interference petal-like patterns. Our scheme offers an accurate method to measure the optical wedge angle with a simple method of digital image processing. This work may also find potential applications in the field of velocity sensing or temperature sensing.