Speckle suppression in line scan display system by 2D Binary code

摘要

A set of 2D binary codes are created for making phase plates to reduce the laser speckle by theoretical computing method. According to the 2D binary code, phase plates are fabricated by etched glass or photoresist with different thickness corresponding to the code. The phase plates are introduced at the intermediate image plane to reduce speckle in laser based line scan display system. According to experiments, the phase plate with the 2D binary code of order 5 can successfully reduce speckle contrast to 17.5%.