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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 33 — Nov. 20, 2006
  • pp: 8440–8447

Diffractive optical elements for beam shaping of monochromatic spatially incoherent light

J. S. Liu, A. J. Caley, and M. R. Taghizadeh  »View Author Affiliations


Applied Optics, Vol. 45, Issue 33, pp. 8440-8447 (2006)
http://dx.doi.org/10.1364/AO.45.008440


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Abstract

Fresnel-type diffractive optical elements (DOEs) for general beam shaping of monochromatic, spatially incoherent light are demonstrated. Direct and indirect methods, i.e., adding a lens' phase to the designed Fraunhofer-type DOEs, are used for the design. The indirect method can reduce the calculation time by approximately half without loss of design accuracy. Two different design examples are shown. For one design the direct method gives a maximum sidelobe intensity of 5.0 % of the maximum intensity in the signal window. For the second design the indirect method gives 23.0 % of this value. The generated patterns can maintain their basic shapes over a long distance. The elements have been fabricated by directly using gray-scale commercial slides as masks. Experimental results are in close agreement with numerical predictions.

© 2006 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(100.5090) Image processing : Phase-only filters
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.3670) Optical devices : Light-emitting diodes

History
Original Manuscript: May 15, 2006
Revised Manuscript: August 14, 2006
Manuscript Accepted: September 1, 2006

Citation
J. S. Liu, A. J. Caley, and M. R. Taghizadeh, "Diffractive optical elements for beam shaping of monochromatic spatially incoherent light," Appl. Opt. 45, 8440-8447 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-33-8440


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