An enhanced method for precise measurement of orbital angular momentum in vortex beams using optical holographic techniques

These days, vortex beams have great application potential due to its carrying of different Orbital Angular Momentum (OAM). However, before practical application, it is important to accurately identify the characteristics of unknown vortex beams, such as analyzing their beam field distribution and measuring OAM, to ensure that they can be used effectively. This paper presents a method for measuring the OAM of vortex beams based on holographic recording and reproduction. The experimental results show that this method can effectively determine the topological charge of the unknown vortex beam, and the OAM of the three vortex beams is ℏ，2ℏ，3ℏ, respectively. It is proved that the high information storage capacity and excellent vortex information reproduction characteristics of the holographic dry plate can be used to measure the unknown vortex beams efficiently.