面向遥感应用的飞秒激光脉冲超长距离传输的研究进展  

Review on Ultra-Long Distance Propagation of Femtosecond Laser Pulses for Remote Sensing Applications

作　　者：冯志芳 刘勋[2] 郝婷 刘丽娜 李维[2] 孙德伟 Feng Zhifang;Liu Xun;Hao Ting;Liu Lina;Li Wei;Sun Dewei(Shanxi Center of Technology Innovation for Light Manipulations and Applications,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China;Beijing Institute of Space Mechanics and Electricity,China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]太原科技大学应用科学学院山西省光场调控与融合应用技术创新中心,山西太原030024 [2]中国空间技术研究院北京空间机电研究所,北京100094

出　　处：《中国激光》2023年第7期41-58,共18页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFB0504400)。

摘　　要：强飞秒激光在空气中传输时,其传输距离会远远超越衍射极限,产生高强度光丝和低密度等离子体,并伴随超连续白光的辐射,这为远距离遥感探测大气污染物提供了一种有效的技术途径。面向天基遥感应用,概述了强飞秒激光长距离传输的研究进展,包括光丝传输的基本研究方法、产生长距离光丝的方法、调控光丝特性的手段以及飞秒激光光丝超长距离的传输,并对光丝在大气遥感应用中的优越特性和需要解决的基础科学问题进行了总结。Significance Intense femtosecond laser pulses propagate far beyond the diffraction limit in air,producing high-intensity filaments and low-density plasma along with the radiation of supercontinuum white light.The properties of filamentation have attracted significant attention owing to their potential applications in many areas,such as lighting control,remote sensing of atmospheric pollution,terahertz emission,and rainmaking.To achieve these goals,a filament with a long-distance transmission is required.However,the variety of complicated environments,for example,cloud,fog,aerosol,and rain,has strong influence on the propagation of filamentation.The atmospheric turbulence and inhomogeneous energy distribution of the initial beam profile result in the generation of multiple filaments,which can shorten the filament length,reduce the spot quality of the beam,and limit various applications of the laser filamentation.Therefore,the generation and control of long-distance filamentation are crucial.In this study,the research progress on the long-distance propagation of femtosecond laser pulses for space-based remote sensing applications is summarized,including the basic research methods of filament propagation,producing long-distance filaments,and modulation of filament characteristics.Furthermore,the advantages of femtosecond laser filaments in atmospheric remote sensing applications and the fundamental science problems to be solved are summarized.Progress The propagation of laser filament in air relies on a dynamic balance between Kerr self-focusing,which causes laser intensity to be clamped at a level of 10^(13)-10^(14) W/cm^(2),and plasma defocusing due to laser-induced ionization,with typical peak electron densities limited to 10^(16)-10^(17) W/cm^(-3).The high intensity filament persists over many diffractions in this process,providing a great opportunity for various applications,particularly remote sensing.Currently,numerous methods have been developed to manipulate the filamentation.The filament lengths can be ext

关 键 词：非线性光学 超快激光 光丝 超连续谱 遥感探测 

分 类 号：O437[机械工程—光学工程]