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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 4 — Feb. 1, 2009
  • pp: 792–798

Low-speckle laser projection with a broad-area vertical-cavity surface-emitting laser in the nonmodal emission regime

Falko Riechert, Gordon Craggs, Youri Meuret, Bart Van Giel, Hugo Thienpont, Uli Lemmer, and Guy Verschaffelt  »View Author Affiliations


Applied Optics, Vol. 48, Issue 4, pp. 792-798 (2009)
http://dx.doi.org/10.1364/AO.48.000792


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Abstract

We demonstrate low-speckle laser projection using a broad-area vertical-cavity surface-emitting laser (VCSEL) emitting at 840 ‚ÄČ nm wavelength as the illumination source. By driving the source in a nonmodal emission regime, we were able to achieve speckle contrast values as low as 3.5% in a realistic projection setup. This was done by driving the VCSEL with specific current pulses without using any additional or mechanically moving components to destroy the coherence of the laser beam. We quantitatively model the speckle contrast reduction based on polarization scrambling and the reduced temporal and spatial coherence of the VCSEL.

© 2009 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(030.1670) Coherence and statistical optics : Coherent optical effects
(030.6140) Coherence and statistical optics : Speckle
(120.2040) Instrumentation, measurement, and metrology : Displays
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers

ToC Category:
Optoelectronics

History
Original Manuscript: October 13, 2008
Revised Manuscript: December 15, 2008
Manuscript Accepted: December 16, 2008
Published: January 26, 2009

Citation
Falko Riechert, Gordon Craggs, Youri Meuret, Bart Van Giel, Hugo Thienpont, Uli Lemmer, and Guy Verschaffelt, "Low-speckle laser projection with a broad-area vertical-cavity surface-emitting laser in the nonmodal emission regime," Appl. Opt. 48, 792-798 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-4-792

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