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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 6 — Feb. 20, 2013
  • pp: 1168–1172

Low-loss high-speed speckle reduction using a colloidal dispersion

Brandon Redding, Graham Allen, Eric R. Dufresne, and Hui Cao  »View Author Affiliations

Applied Optics, Vol. 52, Issue 6, pp. 1168-1172 (2013)

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We present a simple and robust approach to reduce laser speckle, which has limited the adoption of lasers in imaging and display applications. We use colloidal solutions that can quickly reduce speckle contrast due to the Brownian motion of the scattering particles. The high insertion loss associated with propagation through a colloidal solution was overcome by using white paint to cover the sides of the cuvette and an optical fiber to deliver the laser light deep into the colloidal solution, enabling transmission greater than 90%. The diffused laser output followed a Lambertian distribution and produced speckle contrast below 4% at an integration time of 129 μs. The ability for colloidal solutions to achieve fast speckle reduction without power consumption while maintaining high transmission, low cost, a compact size, and a long lifetime makes our approach useful for a wide range of laser imaging and projection applications.

© 2013 Optical Society of America

OCIS Codes
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(170.0110) Medical optics and biotechnology : Imaging systems
(110.0113) Imaging systems : Imaging through turbid media

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 15, 2012
Revised Manuscript: January 14, 2013
Manuscript Accepted: January 15, 2013
Published: February 13, 2013

Virtual Issues
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics

Brandon Redding, Graham Allen, Eric R. Dufresne, and Hui Cao, "Low-loss high-speed speckle reduction using a colloidal dispersion," Appl. Opt. 52, 1168-1172 (2013)

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