Real-time measurement of orbital angular momentum of vortex beams under random fluctuations and obstruction
Abstract
<p indent="0mm">Vortex beams carry orbital angular momentum and are of great application value for increasing the information capacity of optical communication. Accurate measurement of the orbital angular momentum of a vortex beam is a critical issue in free-space optical communication applications. A recent study combined the phase shift theorem with self-reference holography to propose real-time measurements of the orbital angular momentum for randomly fluctuating and obstructed vortex beams. According to the quantitative relationship between the initial orbital angular momentum and the coherent singularity in the observation plane, the sign and magnitude of the initial orbital angular momentum can be determined simultaneously.</p>
