Evolution properties of array laser beams through an atmospheric turbulence and shock-wave layer

Dong Zhi; Dongjun Liao; Huayu Hu; Kouli Zhang; Sen Liu

doi:10.1117/12.2543435

18 December 2019 Evolution properties of array laser beams through an atmospheric turbulence and shock-wave layer

Dong Zhi, Dongjun Liao, Huayu Hu, Kouli Zhang, Sen Liu

Proceedings Volume 11333, AOPC 2019: Advanced Laser Materials and Laser Technology; 113330Q (2019) https://doi.org/10.1117/12.2543435
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

In this manuscript, a numerical model of laser array beams propagation through both turbulent atmosphere and shockwave layer is built. We have calculated the evolution properties of seven coherent laser beams projecting to a plane hypersonic target vertically. We utilize the angular spectrum propagation method with fast Fourier transform algorithm to simulate beam propagation through turbulent atmosphere. To the propagation through shock-wave layer, we first generate the density field and the refractive index field using dual-temperature model and Gladstone Dale formula, respectively. Then the corresponding optical path length and phase screen can be obtained. By analyzing simulated results, we find that the optical intensity distribution before and after through the shock-wave layer are almost the same but the phase distribution differences are significant and decreases almost linearly along the hypersonic flow direction. The phase difference indicates that the shock-wave layer will import a tilt aberration for the optical detection system installed in the hypersonic target.

Citation Download Citation

Dong Zhi, Dongjun Liao, Huayu Hu, Kouli Zhang, and Sen Liu "Evolution properties of array laser beams through an atmospheric turbulence and shock-wave layer", Proc. SPIE 11333, AOPC 2019: Advanced Laser Materials and Laser Technology, 113330Q (18 December 2019); https://doi.org/10.1117/12.2543435

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KEYWORDS

Atmospheric propagation

Laser beam propagation

Atmospheric modeling

Atmospheric optics

Geometrical optics

Fiber lasers

Near field optics

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