非匀幅、部分相干、部分偏振光束的散射特性研究

The study of the statistically optical properties of light wave on scattering and its inverse problem is becoming a fundamental and frontier scientific subject with extensive concerned, the quick progress in this area in recent years and the obtained results will largely promote developments on applications, such as optical communications, remote sensing, detection, and biomedicine, etc. In this subject we will perform some theoretical analyses and formulas derivation, numerical simulations and some key experiments to study the physical changes on the scattering of nonuniform light beams (for examples, higher-order Gaussian beams, vortex beams, beams with aberration), partially coherent light beams, and partially polarized electromagnetic light beams on several kinds of nonhomogeneous media or a collection of particles; discuss the effect of the parameters of input light beams and scattering media on the optical properties of the scattered field, i.e., the spectral density, the spectral degree of coherence, and the spectral degree of polarization; investigate the scattering-induced spectral shifts and spectral switches. What's more, the inverse problem, i.e., the problem of the determination of the properties of the scattering medium from the scattered field will also be discussed. Based on these studies, we will really want to realize its effective modulation of the statistically optical properties of light beams on scattering. The intention of this project is to enrich the subject of light wave scattering theory and solve some practical application problems, which has important scientific meanings and potential application value.

光波散射特性及其逆问题的研究是一个备受国内外学者关注的基础性学术课题，近几年该研究的蓬勃发展和已取得的研究成果无疑会大大推动光通信、遥感、检测、生物医学等应用领域的发展。该项目拟通过理论分析和公式推导、数值模拟和部分关键性实验，研究非匀幅光束（如：高阶高斯光束、涡旋光束、带像差的光束等）、部分相干光束、部分偏振光束等经过多种非均匀介质或粒子系统散射的物理变化规律，讨论入射光源特性和散射介质特性对散射远场光谱强度、光谱相干度、光谱偏振度等统计光学特性的影响，探讨散射中出现的光谱移动和光谱开关的现象。同时，探讨更加有效的重构散射介质信息及光源信息的测量方法。在深入研究光波散射特性的基础上，进而实现光源及散射介质参数对光波散射的统计光学特性的有效调控。开展该项目的研究，有助于丰富和发展光波散射理论，在理论创新的基础上解决若干实际应用问题，该工作具有重要科学意义和潜在应用价值。

光波散射特性及其逆问题的研究是一个备受国内外学者关注的基础性学术课题。该项目主要研究内容包括：研究了随机电磁光束经过色散介质散射的统计光学特性；研究了光波经确定性粒子和随机粒子的混合系统散射后的远场特征；研究了光波经光学阵列的随机散射介质散射的统计光学特性；研究了多色电磁波经介质散射后的强度涨落；研究了标量或矢量光波经半软边准均匀介质散射后的强度、相干度和偏振度特性；研究了多色平面电磁光波经各向异性半软边介质散射后的光谱变化和光谱开关现象；研究了随机电磁高斯谢尔模光束经随机介质散射的强度涨落关联；研究了光波经粒子系统散射后的等价理论。同时，开展了一些新型光束的传输特性研究：引入并研究了一类能够产生旋转高斯阵列的新型扭曲部分相干光束的传输特性；实验上研究了涡旋光束经海洋湍流或大气湍流传输的谱密度变化；提出并实现了一种正弦角向相位分布的新型光束和一种幂指数相位涡旋光束；对电磁涡旋脉冲在色散介质中传输后的偏振度和交叉偏振度进行研究，提出了利用交叉偏振度对涡旋脉冲的轨道量子数的相应测量方法；研究了电磁环形光学框架光源经湍流大气的传输特性；研究了多高斯谢尔模涡旋光束经随机介质的传输特性。总体上，共发表有关SCI学术论文43篇，其中3篇《Optics Letters》、10篇《Optics Express》、1篇《Physical Review A》，所指导的本科生曾荣获得全国大学生挑战杯赛一等奖、二等奖各一项。所取得的研究成果，有助于加强对光波散射本质的认识，有助于加强对一些新型光束传输变换特性的认识，有助于丰富和发展统计光学理论，并可大大推动其在光通信、遥感、检测、生物医学等方面应用领域的发展。