Gas and Droplet Dynamics for Filament-Assisted Free-Space Optical Communication through Clouds  

作　　者：Haiyi Liu Jiawei Zheng Huanyu Li Jiayun Xue Pengfei Qi Xianzhu Liu Lie Lin Weiwei Liu Huilin Jiang 

机构地区：[1]Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Tianjin 300350,China [2]College of Opto-Electronic Engineering,Changchun University of Science and Technology,Changchun 130022,China [3]National and Local Joint Engineering Research Center of Space Optoelectronics Technology,Changchun University of Science and Technology,Changchun 130022,China

出　　处：《Ultrafast Science》2024年第5期36-43,共8页超快科学(英文)

基　　金：supported by the National Natural Science Foundation of China(12074198 and 62105042).

摘　　要：Femtosecond laser filamentation has recently emerged as a promising technique to actively create a channel through clouds and fog,thereby providing a revolutionary opportunity to overcome the obstacle of fog-induced attenuation for free-space optical communication(FSOC)in atmosphere.However,the underlying physics remains elusive,which is critical for optimizing time window and efficiency of guiding light in this channel.In this work,the time evolution of the filament-induced channel is investigated under various laser pulse energies and repetition rates.The combined diffusion model is built to reveal the contributions of gas molecules and aerosol droplets in competition of guiding and defocusing effect of the filament-induced channel.The related findings can deepen our understanding on the underlying physics of the air channel induced by the filament,provide insight into the optimizing time window and efficiency of guiding light,and potentially contribute to the improvement of filament-assisted FSOC.

关 键 词：diffusion model optimizing time window gas dynamics air channel femtosecond laser filamentation guiding light droplet dynamics 

分 类 号：TN929.1[电子电信—通信与信息系统]