Soochow University

Zhen Dong

Yangjian Cai

Yahong Chen

Fei Wang

Xi Sun

Shilei Tan

The invention provides a method and a system for generating a robust higher-order Poincaré sphere polarization state. The method includes: loading vortex phases into fully coherent vector beams for modulating them into left- and right-handed circularly polarized modes in a Poincaré sphere; synthesizing the left-handed and right-handed circularly polarized modes into a vector polarized light beam on the Poincaré sphere, and generating a polarization matrix of the Poincaré sphere; reducing the degree of spatial coherence of the polarized light, performing shaping to obtain a random electromagnetic beam, and simultaneously extracting polarization information in the polarization matrix and transferring the polarization information into a spatial correlation tensor of the random electromagnetic beam; and transmitting the random electromagnetic beam to a far field where the polarization information is transferred from the spatial correlation tensor into a polarization matrix of the random electromagnetic beam, to obtain a robust higher-order Poincaré sphere polarization state.

Method and system for generating a robust higher-order POINCARÉ sphere polarization state

The invention provides a method and a system for generating a polarized propagation-invariant light field. The system includes a laser source, a spatial light modulator, a computer, a first lens, a shading element, a first quarter-wave plate, a second quarter-wave plate, a second lens, and a beam combining element. In the present invention, two Laguerre-Gaussian mode beams that satisfy a particular Gouy order relationship are generated, and orthogonal even polarization is applied to the two Laguerre-Gaussian mode beams. The two Laguerre-Gaussian mode beams are then focused onto a Ronchi grating to be stably combined into polarized propagation-invariant light field. The light field generated in the present invention simultaneously has linear polarization, elliptical polarization, and circular polarization in a cross section of the light field, and in a propagation process of the light field in free space, apart from normal spot size scaling, polarization distribution remains unchanged.

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Suzhou, China

Zhen Dong