Energy focusability of spatial incoherent beam combining for pulse laser propagation in marine atmosphere

In this study, we have deduced the generalized scintillation index of the plane wave and plane wave structure function based on the modified non-Kolmogorov power spectrum of atmospheric refractive index with the spectrum power index & alpha;. In addition, we have analyzed the fluctuation of atmospheric density due to thermal blooming. Based on the interaction of six beams in thermal blooming, the thermal phase screening and intensity distribution are simulated. Under the influence of atmospheric turbulence and thermal blooming, the six-beam combination is then simulated numerically to obtain the equivalent radius with long exposure (RL), power in the bucket (PIB), Strehl ratio (SR), and peak value of intensity (Ip). Results show that PIB, Ip, and SR of the pulse beam combination decrease with an increase in & alpha;; however, RL operates in reverse mode and the short pulse durations reduce the thermal blooming. Moreover, laser of short duration cannot generate high ring energy on the target.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This study deduces the generalized scintillation index and plane wave structure function of the plane wave based on the modified non-Kolmogorov power spectrum of atmospheric refractive index. The fluctuation of atmospheric density due to thermal blooming is analyzed, and the thermal phase screening and intensity distribution of six beams in thermal blooming are simulated. The numerical simulation of the six-beam combination under atmospheric turbulence and thermal blooming is conducted, and parameters such as the equivalent radius, power in the bucket, Strehl ratio, and peak intensity are obtained. Results show that pulse beam combination parameters decrease with an increase in the power spectrum index alpha, except for the equivalent radius which operates in reverse, and short pulse durations can reduce thermal blooming. Laser of short duration cannot generate high ring energy on the target.