Holographic Projection Using Converging Spherical Wave Illumination

A holographic projection system using converging spherical wave illumination has been presented. The system takes into account the combination of Fresnel holographic projection and Fourier holographic projection. The effect of pixelated spatial light modulator is analyzed. By adding the quadratic phase of diffractive lens to the phase of the generated hologram, the separation of image plane from Fourier plane is achieved. Meanwhile, the zero-order beam and high diffraction orders can be filtered out by higher pass filter and aperture placed in the Fourier plane. A holographic projection system based on liquid crystal on silicon is set up. Experimental results show that not only Fresnel holographic projection but also Fourier holographic projection can be achieved without zero order beam and higher diffraction orders in this universal system.