Precise holograms using complex light modulation

Abstract

Our objective is precise wavefront reconstruction using complex modulation of light. A high precision amplitude beam shaper based on a digital micromirror device is used to image a shaped beam onto a phase-only spatial light modulator. To achieve our goal, a significant first step is deriving an efficient backwards propagation algorithm for hologram design that does not degrade the image by truncating high spatial frequencies or by aliasing. In addition, we show that reconstruction fidelity also depends on spatial bandwidth of the amplitude modulation. Thus, a minimum in error is found by considering both factors. Simulation verifies that the target image can be successfully reconstructed by using the proposed method.