title: Speckle suppression in laser display using several partially coherent beams.
abstract: 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.
authors.affiliation: OS Division, SOM R&D and Biz. Group, Samsung Electro-Mechanics Co, Ltd, Suwon, Korea. seungdo.an@samsung.com
authors.forename: Seungdo
authors.initials: S
authors.lastname: An
authors.forename: Anatoliy
authors.initials: A
authors.lastname: Lapchuk
authors.forename: Victor
authors.initials: V
authors.lastname: Yurlov
authors.forename: Jonghyeong
authors.initials: J
authors.lastname: Song
authors.forename: Heungwoo
authors.initials: H
authors.lastname: Park
authors.forename: Jaewook
authors.initials: J
authors.lastname: Jang
authors.forename: Woocheol
authors.initials: W
authors.lastname: Shin
authors.forename: Sergey
authors.initials: S
authors.lastname: Karpoltsev
authors.forename: Sang Kyeong
authors.initials: SK
authors.lastname: Yun
mesh_terms: D003287:Contrast Media; D004867:Equipment Design; D005583:Fourier Analysis; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D007834:Lasers; D008027:Light; D055095:Optics and Photonics; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012825:Silicon; D041623:Tomography, Optical Coherence / Q000295:instrumentation / Q000379:methods*; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D003287:Contrast Media; D012825:Silicon