非均匀大气中准稳态自聚焦效应对靶面光束质量的影响  

Influence of Quasi-Steady-State Self-Focusing Effect in Inhomogeneous Atmosphere on Beam Quality at Target Surface

作　　者：李倩 李桃 胡婧 季小玲[1] Li Qian;Li Tao;Hu Jing;Ji Xiaoling(College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu 610068,Sichuan,China)

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610068

出　　处：《光学学报》2023年第12期48-54,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61775152)。

摘　　要：围绕减小碎片靶面上光斑尺寸从而提高靶面光强的问题,采用解析方法研究了部分相干脉冲光(PCLP)在非均匀大气中的准稳态自聚焦效应对空间靶面光束质量的影响。推导出了PCLP从地面上行大气传输至空间轨道的束宽、曲率半径和实际焦距的解析表达式。研究表明,准稳态自聚焦效应会导致焦移,从而导致靶面光斑尺寸增大。指出采用准稳态和稳态修正焦距方法可以有效抑制准稳态自聚焦效应,从而减小碎片靶面光斑尺寸。推导出了PCLP的准稳态和稳态修正焦距的解析表达式,并给出了其适用条件。研究发现,采用准稳态修正方法能获得比稳态修正方法更小的靶面光斑尺寸,但稳态修正方法更易实现。Objective The risk of spacecraft damage caused by space debris is increasing.The groundbased laser spacedebris removal(GBLSDR)is an effective method for removing centimeterscale space debris in the lowearth orbit region.However,the problem of highpower laser beam propagation through the atmosphere will be encountered by the GBLSDR.For the application of GBLSDR,the beam power is well above the critical power of the selffocusing effect in the atmosphere.Until now,several studies have been carried out to analyze the influence of the selffocusing effect in the atmosphere on the beam quality at the debris target.It is shown that the intensity at the debris target decreases because of the selffocusing effect in the atmosphere.It is found that uniform irradiation at the debris target may be achieved because of the phase modulation caused by the selffocusing effect in the inhomogeneous atmosphere.In addition,the influence of the beam spatial coherence and the beam order on the selffocusing effect in the inhomogeneous atmosphere is also studied.However,these studies are restricted to the steadystate selffocusing effect in the inhomogeneous atmosphere,and they fail to consider the quasisteadystate selffocusing effect.It is known that a pulsed beam is more suitable for the application of GBLSDR than a continuous wave(CW)laser beam.When the response time of media to the field is much shorter than the pulse width,the selffocusing effect can be called the quasisteadystate selffocusing effect.Therefore,it is important to study the influence of the quasisteadystate selffocusing effect in the inhomogeneous atmosphere on the beam quality at the target surface for the application of GBLSDR.Methods In general,under the standard paraxial approximation,the propagation of a highpower laser beam propagating from the ground through the atmosphere to space orbits can be described by the nonlinear Schrödinger equation.In addition,the B integral is an important characteristic parameter to quantitatively describe the beam quality degradatio

关 键 词：大气光学 准稳态自聚焦效应 激光大气传输 部分相干脉冲光 靶面光斑尺寸 

分 类 号：O437.5[机械工程—光学工程]