Dynamic shaping of vectorial optical fields based on two-dimensional blazed holographic grating**Project supported by the National Natural Science Foundation of China (Grant Nos. 91750202 and 11534006) and the National Key R&D Program of China (Grant Nos. 2018YFA0306200 and 2017YFA0303700).

Abstract

We propose a vectorial optical field generation system based on two-dimensional blazed grating to high-efficiently generate structured optical fields with prescribed amplitude, phase, and polarization. In this system, an optimized blazed grating hologram is written on a spatial light modulator (SLM) and can diffract the majority of the incident light into the first-order diffractions of the x and y directions, which then serve as base vectors for synthesizing desired vector beams. Compared with the conventional cosine grating used in the previous work, the proposed two-dimensional, blazed grating has a much higher efficiency. Both computer simulation and optical experiment validate that a conversion efficiency up to 5 times that of the former work is achieved. Our method can facilitate applications of the optical field manipulation.