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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 2 — Jan. 10, 2001
  • pp: 211–218

Design and fabrication of a hybrid diffractive optical device for multiple-line generation over a wide angle

Luiz Gonçalves Neto, Luciana Brassolatti Roberto, Patrick Verdonck, Ronaldo Domingues Mansano, Giuseppe Antonio Cirino, and Mario Antonio Stefani  »View Author Affiliations


Applied Optics, Vol. 40, Issue 2, pp. 211-218 (2001)
http://dx.doi.org/10.1364/AO.40.000211


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Abstract

A new hybrid optical device that is capable of splitting a monochromatic laser beam into an arbitrary number of lines over a wide angle is presented. It consists of a binary surface-relief computer-generated phase hologram and a continuous parabolic surface-relief grating. In this device the phase hologram serves to generate three small, parallel lines while the continuous parabolic surface-relief phase grating acts as an array of diverging parabolic lenses to widen these lines. The binary surface-relief was generated into one side of a quartz substrate through a plasma-etching process, and the parabolic profile was generated into a thick photoresist deposited on the other side of the quartz substrate. Calculations showed that a diverging parabolic lens with a f-number of 0.5 would deliver the desired optical pattern of multiple beams distributed over 90°. A surface-relief depth of 6.0 µm was calculated with consideration of the phase distributions of such lens. The parabolic profiles were fabricated in a 10-µm-thick photoresist, by use of a contact exposure through a mask with a space pattern of repetitive 4- and 6-µm lines. He–Ne laser light was passed through a device that generated three parallel lines over a 90° angle. The resulting diffraction patterns were characterized, and a satisfying result was obtained. The resulting multiple-line pattern can be used in robot vision and other applications.

© 2001 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics

History
Original Manuscript: March 28, 2000
Revised Manuscript: September 5, 2000
Published: January 10, 2001

Citation
Luiz Gonçalves Neto, Luciana Brassolatti Roberto, Patrick Verdonck, Ronaldo Domingues Mansano, Giuseppe Antonio Cirino, and Mario Antonio Stefani, "Design and fabrication of a hybrid diffractive optical device for multiple-line generation over a wide angle," Appl. Opt. 40, 211-218 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-2-211

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