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Proceedings Paper

Speckle reduction in laser projection systems
Author(s): L. L. Wang
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Paper Abstract

In laser projection systems the observer in the far field of the image points of the screen will recognize serious speckle noise. There are many methods to reduce or eliminate speckles in the near field, by reducing or eliminating spatial or temporal coherence of the laser. But for far field, it is hardly possible to change coherence properties of laser sources. In this paper we propose a new method to eliminate speckles in the far field by using diffractive optical elements. Intensity modulation depth in the far field speckle pattern could be reduced to a few percent with keeping good beam quality.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778CY (1 September 1996); doi: 10.1117/12.2316155
Show Author Affiliations
L. L. Wang, Technische Univ. Darmstadt (Germany)


Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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