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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 51, Iss. 12 — Apr. 20, 2012
  • pp: 1894–1904

Laser speckle reduction by multimode optical fiber bundle with combined temporal, spatial, and angular diversity

Dalip Singh Mehta, Dinesh N. Naik, Rakesh Kumar Singh, and Mitsuo Takeda  »View Author Affiliations


Applied Optics, Vol. 51, Issue 12, pp. 1894-1904 (2012)
http://dx.doi.org/10.1364/AO.51.001894


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Abstract

We report significant speckle reduction in a laser illumination system using a vibrating multimode optical fiber bundle. The optical fiber bundle was illuminated by two independent lasers simultaneously. The beams from both lasers were first expanded and collimated and were further divided into multiple beams to illuminate the fiber optic bundle with normal and oblique incidence. Static diffusers were also placed at the input and output faces of the fiber bundle, thus introducing the spatial as well as angular diversity of illumination. Experiments were carried out both in free space and in imaging geometry configuration. Standard deviation, speckle contrast and signal-to-noise ratio of the images were computed, and the results were compared with those of white light illumination. Speckle contrast close to that of white light was obtained using a vibrating fiber bundle with combined temporal, spatial, and angular diversities of the illumination.

© 2012 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(110.6150) Imaging systems : Speckle imaging
(120.2040) Instrumentation, measurement, and metrology : Displays
(140.0140) Lasers and laser optics : Lasers and laser optics

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: October 20, 2011
Revised Manuscript: January 3, 2012
Manuscript Accepted: January 6, 2012
Published: April 11, 2012

Citation
Dalip Singh Mehta, Dinesh N. Naik, Rakesh Kumar Singh, and Mitsuo Takeda, "Laser speckle reduction by multimode optical fiber bundle with combined temporal, spatial, and angular diversity," Appl. Opt. 51, 1894-1904 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-12-1894

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