Study on the effects of atmospheric environment on the transmittance of laser transmission based on the Monte Carlo method

Haiyang Qi; Dong Liu; Zhemin Chen; Sunqiang Pan; Sumei Liu; Pengbing Hu; Wenzhao Zhou

doi:10.1117/12.2606942

24 November 2021 Study on the effects of atmospheric environment on the transmittance of laser transmission based on the Monte Carlo method

Haiyang Qi, Dong Liu, Zhemin Chen, Sunqiang Pan, Sumei Liu, Pengbing Hu, Wenzhao Zhou

Author Affiliations +

Proceedings Volume 12060, AOPC 2021: Advanced Laser Technology and Applications; 120601O (2021) https://doi.org/10.1117/12.2606942
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Ideally, lasers follow Beer-Lambert's law when travel through the atmosphere. Beer-Lambert’s law is premised on single scattering. However, in the actual atmospheric environment a variety of circumstances will cause the deviation of Beer-Lambert’s law. In this study, a simulation model of laser atmospheric transmission is established based on the Monte Carlo method. The established simulation model is from the perspective of each photon. The random motion of photons is simulated, that is to say, the radiation transport equation is not involved. In simulation model, migration direction and migration distance of photons are determined by the sampling theory of Monte Carlo on the probability distribution of photons scattering angle and free path. Migration direction is determined by the scattering phase function. Migration distance is related with the extinction coefficient. The energy change caused by scattering is determined by the single scattering albedo(abs). For a photon, if its energy is absorbed to zero before it reaches at the detector, calculation of this photon transmission process would be end up. Whether a photon is received by the detector can be judged by observing whether the motion track of the photon intersects with the detection region. Thus, by tracking motion track of each photon of the laser beam, the transmission of the laser can be obtained. In this study, several key factors of laser transmittance in the atmosphere such as extinction coefficient, ratio of scattered light, and absorption are carefully studied by the established simulation model.

Citation Download Citation

Haiyang Qi, Dong Liu, Zhemin Chen, Sunqiang Pan, Sumei Liu, Pengbing Hu, and Wenzhao Zhou "Study on the effects of atmospheric environment on the transmittance of laser transmission based on the Monte Carlo method", Proc. SPIE 12060, AOPC 2021: Advanced Laser Technology and Applications, 120601O (24 November 2021); https://doi.org/10.1117/12.2606942

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KEYWORDS

Scattering

Monte Carlo methods

Absorption

Transmittance

Laser scattering

Mass attenuation coefficient

Multiple scattering

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