Open AccessSpeckle suppression in laser display using several partially coherent beams
Author(s) -
Sung Yong An,
Anatoliy Lapchuk,
Victor Yurlov,
Jay Hyok Song,
HeungWoo Park,
Jaewook Jang,
Weon Ho Shin,
Sergey Karpoltsev,
Sang Kyeong Yun
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.000092
Subject(s) - speckle pattern , optics , decorrelation , coherence (philosophical gambling strategy) , physics , diffraction , speckle noise , speckle imaging , beam (structure) , image plane , electronic speckle pattern interferometry , computer science , image (mathematics) , algorithm , quantum mechanics , artificial intelligence
An optical scheme for speckle suppression using two or three partially coherent beams in a projection system is proposed. Diffractive optical elements (DOE) placed in the intermediate image plane create several beams carrying the image to a screen. Transparent plates of different thicknesses are placed in the Fourier plane of the projective lens and used for beam decorrelation. The coherence matrix algorithm for speckle suppression is used to calculate the speckle contrast ratio. It is shown that for a small decorrelation length and using the same maximum thickness of the transparent plates, two partially coherent beams would provide better suppression than three beams with different diffraction orders. However, for a large decorrelation length, the three beam setup provides better speckle suppression for all three colors examined with a suppression coefficient close to theoretical limits. Verification of speckle suppression using three-beam decorrelation is reported.