Measurement of the coherence-orbital angular momentum matrix of a partially coherent beam
Abstract
The recently introduced coherence-orbital angular momentum (COAM) matrix of a partially coherent beam [Phys. Rev. A 103, 023529 (2021)10.1103/PhysRevA.103.023529] is experimentally measured for the first time, to the best of our knowledge. The new methodology based on Young’s interference experiment with a pair of ring-shaped slits with embedded spiral phases is thoroughly described. By introducing the phase shift of 0 and π / 2 between two ring slits, the real and imaginary parts of the elements of the COAM matrix are obtained by measuring the on-axis spectral density in the far field of the double-ring slit. We validate our protocol through measuring the COAM matrix of an elliptical Gaussian Schell-model (GSM) beam which reveals the existence of non-trivial correlations between modes with different topological indices. The experimental results agree reasonably well with the theoretical predictions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 26, 2022
- Source ID
- 10.1364/ol.467452
Entities
People
- Fei Wang
- Greg Gbur
- Haiyun Wang
- Olga Korotkova
- Yahong Chen
- Yangjian Cai
- Zhaohui Yang
Organizations
- Air Force Office of Scientific Research
- National Natural Science Foundation of China
- Office of Naval Research
- Shandong Normal University
- Soochow University
- University of Miami
- University of North Carolina at Charlotte