部分相干光束轨道角动量调控、测量及应用基础研究

具有轨道角动量的完全相干光束已在微粒操控、相衬显微镜、高速光通信、旋转物体的遥感探测等方面获得了广泛的应用。携带涡旋相位或扭曲相位的部分相干光束是目前仅有的两种携带轨道角动量的部分相干光束，在很多应用领域具有独特的优势，但是对于其产生及测量研究刚刚开始。本项目将分别研究这两种不同光束的产生及测量以及在涡旋相位和扭曲相位共同调控下的部分相干光束在自由空间及介质中的光强、相干度、轨道角动量的演化特性；实验上产生同时具有涡旋相位和扭曲相位的部分相干光束并测量其轨道角动量的大小；理论与实验结合，探索同时具有涡旋相位和扭曲相位的部分相干光束在信息传输、微粒操控中的应用。本项目将丰富部分相干光束轨道角动量调控理论，为其在信息传输、微粒操控中的应用奠定基础。

Fully coherent light beam with orbital angular moment (OAM) has been applied widely in many areas such as manipulating microscope particles, phase contrast microscope, high date-rate optical communications and the remote detection of spinning objects. Partially coherent vortex beam and twisted partially coherent beam are two types of partially coherent beams with OAM，and they display many interesting properties and unique advantages in many applications, while the research on generating and measuring of such beams just start. In this project, we will investigate the experimental generation and measurement of this two different types of partially coherent beams separately. The combined action of vortex phase and twist phase on the evolution properties of partially coherent beam, such as the spectral density, spectral degree of coherence and orbital angular moment will also be explored. Then we will generate the partially coherent beam with both vortex phase and twist phase, and measure the magnitude of OAM. We also will explore the potential applications of partially coherent beam with both vortex phase and twist phase in information transmission and particle trapping both theoretically and experimentally. This project will enrich the theory for manipulating the OAM of partially coherent beam, and provide supports for many applications, such as information transmission and particle trapping.