公开(公告)号：US20230366732A1

公开(公告)日：2023-11-16

申请号：US18196830

申请日：2023-05-12

Applicant: SOOCHOW UNIVERSITY

Inventor： Zhuoyi WANG ,  Chengliang ZHAO ,  Xingyuan LU ,  Qidong LIN ,  Xiaotan LU ,  Xuechun ZHAO ,  Yangjian CAI

IPC: G01J1/42 ,  G01J1/04

CPC classification number: G01J1/4257 ,  G01J1/0411 ,  G01J2001/4261

Abstract: A to-be-measured partially coherent fractional vortex beam passes through a scattering object, an error between measurable information and to-be-measured information is minimized by using an optimization algorithm, and a main electric field mode and a weight of a to-be-measured fractional vortex beam are reconstructed by using a multimode stacked diffraction algorithm. A cross-spectral density function of the partially coherent fractional vortex beam is calculated, a cross-spectral density of a partially coherent fractional vortex optical field is reconstructed, and complete information including light intensity, a light intensity association, an electric field association, a phase, and the like of the partially coherent fractional vortex optical field is obtained. After the complete information of the partially coherent fractional vortex optical field is obtained, reverse transmission calculation is performed to obtain a source field vortex phase distribution, thereby implementing accurate topological charge measurement of the fractional vortex beam under low coherence conditions.