Mitigating thermal blooming effect of the atmosphere using time-dependent rotationally-symmetric power-exponent-phase vortex beam

Abstract

The thermal blooming effect induced by high-power laser beams propagating through the atmosphere can result in a degradation of beam quality. This article proposes the utilization of time-dependent rotationally-symmetric power-exponent-phase vortex beam (TDRSPEPVB) as a means to mitigate thermal blooming effect during propagation in the atmosphere. Firstly, TDRSPEPVB is obtained by introducing a time factor into the phase term of rotationally-symmetric power-exponent-phase vortex beam (RSPEPVB). A comparative analysis was conducted on the thermal blooming effects of TDRSPEPVB and RSPEPVB in the atmosphere. The results indicate that TDRSPEPVB exhibits superior anti-thermal blooming ability compared to RSPEPVB and better preserves the shape of light spots during propagation through the atmosphere. These findings suggest that rotational motion can effectively mitigate thermal blooming effect for petal-like shaped high-order mode beams, providing valuable guidance for their application in atmospheric conditions.