REDUCTION OF SPECKLE AND INTERFERENCE PATTERNS FOR LASER PROJECTORS

摘要

The invention provides a system and method for reducing laser speckle and interference patterns in a laser projector display when using a laser projector having a spatial light modulator (SLM) with a defined pixel rate. The method can include the operation of polarizing a laser output 104 of a continuous wave laser 102 such that the laser output is s-polarized with respect to a beam combiner 140. The s-polarized laser output 108 can be divided into a first laser beam 112 and a second laser beam 116. A phase of the second laser beam 116 can be modulated with an amplitude sufficient to create a phase delay of approximately half a wavelength of the laser output 104 and at a frequency at least twice that of the SLM' s pixel rate.