基于傅里叶分析的光场轨道角动量调控及应用
Manipulation and Application of Orbital Angular Momentum in Light Field Based on Fourier Analysis
Abstract
本文基于傅里叶变换光学原理对轨道角动量光束进行调控，主要研究内容为分数阶螺旋相衬成像和彩色轨道角动量光束的制备。 整数阶l=1的螺旋相位滤波器可以对观察物体实现各向同性边缘增强效果，但是对于分数阶螺旋相衬成像还缺乏系统而完整的研究。我们以相位物体为研究对象，引入分数阶螺旋相位滤波来研究渐进边缘增强现象。实验中用到两个空间光调制器：一个用来显示相位型五角星物体，另一个用来充当动态的分数阶螺旋滤波器。通过从0到1逐渐改变分数阶涡旋拓扑值Q，我们可以观察到图像边缘和背景的亮度反转，在图像边缘的渐进增强过程中还可以观察到选择性边缘增强现象。实验结果可以从数字螺旋成像原理，即分数阶轨道角动量的频谱分量... In this paper, orbital angular momentum were manipulated by Fourier transform optics, and we mainly studied the fractional spiral phase contrast imaging and the generation of chromatic orbit angular momentum beam. The spiral phase filter with integer order l=1 can achieve the isotropic edge enhancement effect on the observed object, but the research on the fractional spiral phase contrast imaging...