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Proceedings Paper

Low-speckle laser projection using farfield nonmodal emission of a broad-area vertical-cavity surface-emitting laser
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Paper Abstract

We discuss how the nonmodal emission regime's farfield of a broad-area vertical-cavity surface-emitting laser (BAVCSEL) can be used for low-speckle laser projection. More specifically we investigate how the farfield of a BA-VCSEL in its nonmodal emission regime can be used for low-speckle laser projection. A microlens beam homogenizer is used to exploit the low spatial coherence of the VCSEL. Speckle contrast values as low as 2.5% are measured without using any additional or mechanically moving components to destroy the coherence of the laser beam. We explore and explain the effect on the speckle contrast of the beam's size on the homogenizer. We successfully modeled the speckle contrast reduction, taking into account all contributing speckle reducing factors.

Paper Details

Date Published: 27 April 2010
PDF: 8 pages
Proc. SPIE 7720, Semiconductor Lasers and Laser Dynamics IV, 772020 (27 April 2010); doi: 10.1117/12.854427
Show Author Affiliations
Gordon M. J. Craggs, Vrije Univ. Brussel (Belgium)
Falko Riechert, Univ. Karlsruhe (Germany)
Youri Meuret, Vrije Univ. Brussel (Belgium)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)
Uli Lemmer, Karlsruhe Institute of Technology (Germany)
Guy Verschaffelt, Vrije Univ. Brussel (Belgium)


Published in SPIE Proceedings Vol. 7720:
Semiconductor Lasers and Laser Dynamics IV
Krassimir Panajotov; Marc Sciamanna; Angel A. Valle; Rainer Michalzik, Editor(s)

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