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Proceedings Article

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

[+] Author Affiliations
Gordon M. J. Craggs, Youri Meuret, Hugo Thienpont, Guy Verschaffelt

Vrije Univ. Brussel (Belgium)

Falko Riechert

Univ. Karlsruhe (Germany)

Uli Lemmer

Karlsruhe Institute of Technology (Germany)

Proc. SPIE 7720, Semiconductor Lasers and Laser Dynamics IV, 772020 (April 27, 2010); doi:10.1117/12.854427
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From Conference Volume 7720

  • Semiconductor Lasers and Laser Dynamics IV
  • Krassimir Panajotov; Marc Sciamanna; Angel A. Valle; Rainer Michalzik
  • Brussels, Belgium | April 12, 2010

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.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Gordon M. J. Craggs ; Falko Riechert ; Youri Meuret ; Hugo Thienpont ; Uli Lemmer, et al.
"Low-speckle laser projection using farfield nonmodal emission of a broad-area vertical-cavity surface-emitting laser", Proc. SPIE 7720, Semiconductor Lasers and Laser Dynamics IV, 772020 (April 27, 2010); doi:10.1117/12.854427; http://dx.doi.org/10.1117/12.854427


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