Optimization method of diffraction efficiency of cascade liquid crystal polarization gratings based on polarization compensation

Research on the deflection characteristics of non-mechanical beams of liquid crystal phase retardation cascade polarization gratings

“…birefringence property of liquid crystal box by applying an electric field, and the working principle of liquid crystal adjustable phase retarder is developed according to this property. Compared with the traditional grating, the solidified polarization grating has only ± 1 order of diffraction, which is two circularly polarized light orthogonal to each other, which can realize the complete transfer of incident light energy to the polarization orthogonal diffraction stage, and the theoretical single-stage diffraction efficiency is up to 99.6% [10], and the grating can change the diffraction angle by changing the wavelength and grating dispersion when diffraction occurs [11][12][13]. In 2008, Zhang Jian's team at Harbin Institute of Technology developed a one-dimensional liquid crystal optical device that realizes continuous deflection and scanning at 60 angles with a deflection angle of 2.0014° [14].…”