Turbulence Impacted Wavefront Corrections Using Beam Modulation Technique

TL;DR

This paper introduces a novel beam shaping technique using vortex phase plates and turbulence simulators to reduce turbulence effects on laser beams, with experimental validation through scintillation index measurements.

Contribution

The study presents a new experimental approach combining vortex beam shaping and turbulence simulation to mitigate turbulence impacts on laser propagation.

Findings

Turbulence impacts can be reduced using vortex phase plates.

Beam profile measurements vary with propagation distance and turbulence conditions.

Different topological charges influence turbulence resilience.

Abstract

New experimental technique have been proposed to discuss the turbulence impact reduction using beam shaping technique. In first phase of experiments, turbulence Impacted Vortex beam shaping technique has been introduced for a propagating beam which is effected by Kolmogorov type lab based turbulence simulator using Pseudo Random Phase Plate (PRPP). The new technique is executed with a spatially filtered collimated Gaussian beam that is propagated through computer controlled rotating PRPP to introduce the lab based turbulence on the beam profile. The turbulence impacted beam is then propagated through Vortex Phase Plate (VPP) to shape that beam into different topological charged Laguerre Gaussian modes and further collimated using two lens based configuration. We have measured the scintillation index of the spatial intensity profile collected from CCD. Comparative studies have been done by placing the image plane in five different positions on the propagation path of the beam so that we can detect Collimated, diverging and converging outputs. Four topological charges of LG beams and Gaussian beam have been used to envisage results.