基于LCOS的菲涅耳透镜实验测定

Phase-only liquid crystal spatial light modulator (LCOS), as a kind of programmable light modulator, can modulate the optical wavefrontbe pixel by pixel through the external voltage. LCOS plays an important role in optical information process, and replaces the traditional optical elements gradually. Due to its low power consumption, no mechanical inertia, programmability, high resolution and high diffraction efficiency, LCOS has been widely used in adaptive optics, multi-channel imaging, dynamic holographic optical tweezers, etc. Based on the modulation curves under the different conditions, a phase Fresnel lens is loaded onto LCOS. The sampling requirement of the lens is satified, and the focal length, diffraction efficiency and imaging quality of the lens is experimentally tested respectively.