Besinc相干涡旋光束的产生与传输

Generation and Propagation of Besinc-Correlated Partially Coherent Vortex Beams

研究了Besinc相干涡旋光束的产生与传输。理论上采用范西特-泽尼克定理,研究环形可控非相干光源经自由空间传输后的空间相干性。理论研究表明经自由空间传输后,环形可控非相干光源发射出的光束由非相干光逐渐演变为部分相干光,且光束的部分相干项为Besinc相干。实验上采用环形可控非相干光源以及螺旋空间相位板,产生空间相干可控的Besinc相干涡旋光束,并采用双缝干涉验证拓扑电荷数。另外,基于广义惠更斯-菲涅耳原理还研究了Besinc相干涡旋光束在自由空间中的传输,考虑相干度调节对传输的影响。

The generation and propagation of a Besinc-correlated partially coherent vortex beam（BS-PCV beam）have been investigated. Based on the van Cittert–Zernike Principle, the spatial coherence distribution of the light beams, which radiated from the controllable annular extended incoherent light source is studied theoretically. The theoretical calculations show that, the spatial coherence of the light beams which radiate from controllable annular extended incoherent light source changes into partial coherence after propagation. Moreover, the spatial coherence of the light beams is Besinc-correlation. Experimentally, A BS-PCV beam with controllable spatial coherence is generated by using an annular extended incoherent light source and a spiral phase plate. Furthermore, by use of the double-slit interference the topology charge number is measured. Additionally, the propagation of BS-PCV beams in a free space is investigated based on extended Huygens- Fresnel Principle. The influence of the controllable spatial coherence on the propagation is investigated.