非高斯关联部分相干光束的传输与光学捕获研究

The non-Gaussian correlated partially coherent beams have exhibited unique optical characteristics including self-focusing,self-shifting, self-shaping and self-splitting, and applied in free space communication, material process and optical micro-manipulation. More attentions are paid to the researches around the propagation regulation, statistics characteristics as well as the mechanism of the interaction with random media and micro-particles. In this project, we study the propagation regulation and optical trapping on micro-particles of the novel special correlated partially coherent beams. (1) The intrinsic relations of the statistical properties of the special correlated partially coherent vectorial beams with initial correlated properties and random media are mainly studied, and the methods of regulating the spectral degree of polarization and the degree of coherence are developed. (2) The focusing properties of the novel beams are analyzed and the trapping characteristics of the focused beams on particles are probed. (3) The mechasims of the generation of the special correlated partially beams are explored, and new special correlated beam model are introduced. This project will enrich the theory of beams propagation, and promote the generation of new beams and the development of optical tweezers.

非高斯关联部分相干光束展现了独特的光学特性：自聚焦、自偏移、自整形和自分裂，在自由光通信、材料加工以及光学微操控等领域有重要的应用价值。这类光束光场的传输调控、统计特性的表征以及与随机介质、微观粒子相互作用机理研究引起了研究者极大的关注。本项目拟研究新型的非高斯关联部分相干光束的传输调控以及对微观粒子光学捕获特性。（1）重点研究特殊关联部分相干矢量光束经过光学系统以及随机介质传输后的统计特性与初始光束关联特性以及随机介质间的内在联系，获得调控光束光谱偏振度和光谱相干度的方法。（2）分析新型特殊关联部分相干光束聚焦场特性，探究光束经过聚焦系统后对微观粒子的捕获规律。（3）探究特殊关联部分相干光束的产生机理，拓展并引入新型特殊关联部分相干光束模型。本项目的工作将丰富光束传输理论，推动新型光束的生成和光镊技术的发展。

近年来，具有特殊关联结构的部分相干光束由于独特的远场强度分布特征引起了研究人员的广泛关注。在本项目中，我们首先引入了一种特殊的脉冲光源，其时间关联函数是两种合理的时间关联函数的卷积形式，研究发现通过卷积运算可以对脉冲光束远场的强度分布和相干度分布进行调制。进一步，我们研究了多sinc谢尔模光束在各项异性扰动海水中的统计特性，通过与其在真空中和各项同性海水中传输特性的比较，来分析海水扰动因子和各项异性因子对多sinc谢尔模光束传输特性的影响，结果表明在各项异性的海水中，光束有更强的抗扰动行为。在此基础上，我们还研究了扭曲的电磁各项异性多高斯谢尔模光束和椭圆或光学框架的传输特性，由于扭曲相位的存在，光束在传输过程中，光斑沿光轴旋转。该项目的研究在激光脉冲加工和整形，光通信和光学捕获等方面的应用有重要的意义。