Suppression of Zeroth-Order Diffraction in Phase-Only Spatial Light Modulator via Destructive Interference with a Correction Beam

摘要

We suppress the unwanted zeroth order diffraction (ZOD) contributed by the dead areas of a spatial light modulator with a correction beam that is independently created from the desired target. We use the Gerchberg-Saxton algorithm to generate the phase of the correction beam profile that would match correctly with that of the ZOD. The correction beam intensity is regulated using a coefficient to match also with that of the ZOD. Numerical simulation reveals a ZOD suppression that is as high as -99% but only -32% has been achieved so far experimentally.