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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 10 — Apr. 1, 1998
  • pp: 1770–1775

Speckle reduction in laser projection systems by diffractive optical elements

Lingli Wang, Theo Tschudi, Thorsteinn Halldórsson, and Pálmi R. Pétursson  »View Author Affiliations


Applied Optics, Vol. 37, Issue 10, pp. 1770-1775 (1998)
http://dx.doi.org/10.1364/AO.37.001770


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Abstract

In laser projection systems the observer in the far field of the image points on the screen will recognize serious speckle noise. There are many methods to reduce or eliminate speckles in the near field by reducing or eliminating temporal or spatial coherence of the laser. But for the far field it is hardly possible to change the coherence properties of laser sources so that speckles will disappear. We propose a new method for eliminating speckles in the far field by using a diffractive optical element. The intensity modulation depth in the far-field speckle pattern can be reduced to a few percent while good beam quality is preserved.

© 1998 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(050.1970) Diffraction and gratings : Diffractive optics
(140.0140) Lasers and laser optics : Lasers and laser optics

History
Original Manuscript: August 7, 1997
Revised Manuscript: November 13, 1997
Published: April 1, 1998

Citation
Lingli Wang, Theo Tschudi, Thorsteinn Halldórsson, and Pálmi R. Pétursson, "Speckle reduction in laser projection systems by diffractive optical elements," Appl. Opt. 37, 1770-1775 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-10-1770

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