Abstract
The turbulence effect, thermal blooming effect, laser beam aberration, platform jitter, and other effects in the process of high energy laser propagation in the atmosphere will cause serious degradation of laser beam quality, which will have a negative impact on the actual application of laser propagation engineering. It is important in the engineering application of high-energy laser propagation to evaluate the far-field intensity distribution quickly. Based on the optical transfer function (OTF) theory of imaging system, the propagation process of high-energy lasers is modeled as the imaging process of point source. By using the convolution of point spread function (PSF) of jitter, turbulence, thermal blooming, and aberration of emission system, fast calculation of the far-field intensity distribution of high energy laser is realized. The calculation results are compared with those obtained by the 4D wave optics simulation program in different propagation scenarios. The results show that the calculated facula distribution and encircled energy of this method are in good agreement with the simulation results of wave optics, which can realize the fast and accurate evaluation of the far-field intensity distribution of high-energy laser propagation and provide a reference for practical engineering application.
Highlights
A series of propagation effects, such as turbulence effect and thermal blooming effect, will be produced in the process of high energy laser (HEL) propagation in the atmosphere [1]
In order to verify the applicability of the fast calculation model to a wide range of practical applications, we apply PSFFC for a fast calculation model to the multiple high-power laser propagation scenarios, which are designed to encounter various effects, including the turbulence effect, the thermal blooming effect, laser beam aberration, and platform jitter
A fast calculation method of far-field intensity distribution with point spread function (PSF) convolution for thermal blooming and turbulence effects on HEL propagation is proposed in this paper
Summary
A series of propagation effects, such as turbulence effect and thermal blooming effect, will be produced in the process of high energy laser (HEL) propagation in the atmosphere [1]. Researchers generally use the method of scaling law to analyze the beam quality of laser far-field long exposure facula; that is, through a 4D wave optics program to simulate the far-field peak intensity and the beam expansion radius under a certain ring energy under different turbulence, thermal blooming, initial beam quality, and other parameters, and use the characteristic parameters describing these effects to fit the results to achieve the characteristics parameter scaling of far-field beam quality. Gaussian beam by using the generalized thermal distortion parameter, and obtained the scaling formula of laser far-field facula expansion based on the RMS approximation theory, assuming that the far-field distribution is Gaussian distribution. Van Zandt’s new scaling law model results and the calculation method of PSF proposed by scholars, in this paper we try to explore and validate the theory model of the convolution method for HEL propagation with turbulence and thermal blooming effects. To test our theory and model, the improved method is compared with the simulation results of a four-dimensional program of wave optics
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