根据数字螺旋成像法,利用光的轨道角动量记录物体信息,通过分析轨道角动量谱获取了相位型物体的信息;研究了使用不同拉盖尔-高斯(LG)光束探测时,简单的标准相位型物体轨道角动量谱的特性。结果表明,通过分析轨道角动量谱,可以有效地得到相位型物体的相位信息以及透射率信息。对不同拓扑荷数以及径向节点数的LG光束探测光所产生的不同衍射级频谱分量进行数值分析,结果表明探测光为高阶的LG光束时,更有利于探测简单的相位型物体的信息。

According to the digital spiral imaging method, the information of the object is recorded by the orbital angular momentum of light. Through analyzing the orbital angular momentum spectra, we obtain the information of the phase object. Characteristics of the orbital angular momentum spectra of a simple canonical phase object are studied when different Laguere-Gaussian (LG) beams are used in detection. The results show that we can obtain the phase and transmittance information effectively by analyzing the orbital angular momentum spectra. Spectral components with different diffraction orders produced by the LG beams with different topological charges and radial node numbers are analyzed. The results show that the high-order LG beam is more conductive to probe the information of a simple canonical phase object.