Abstract

The impact of the precision and direction of motion of a two-dimensional (2D) diffractive optical element (DOE) based on binary pseudo-random sequences on speckle suppression efficiency is investigated experimentally. The experimental data show a large speckle suppression efficiency and agree qualitatively with the theoretical results. The experimental results confirm that the wavelength range for the speckle suppression of a two-level 2D DOE based on binary random sequences is narrower than the visible range. The experimental data confirm the theoretical prediction that the wavelength range for the speckle suppression for a double-sided one-dimensional (1D) DOE is wider than the visible range. The large speckle suppression coefficient $k>16$ and a speckle contrast below 2.6% are obtained in the entire visible range by using one two-sided 1D $M$-sequence-based DOE with code length $N=15$. The proposed method has potential applications in laser projection display systems.

© 2017 Optical Society of America

Experiment evaluation of speckle suppression efficiency of 2D quasi-spiral M-sequence-based diffractive optical element

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Optimal speckle suppression in laser projectors using a single two-dimensional Barker code diffractive optical element

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J. Opt. Soc. Am. A 30(2) 227-232 (2013)