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

Gordon M. J. Craggs; Falko Riechert; Youri Meuret; Hugo Thienpont; Uli Lemmer; Guy Verschaffelt

doi:10.1117/12.854427

27 April 2010 Low-speckle laser projection using farfield nonmodal emission of a broad-area vertical-cavity surface-emitting laser

Gordon M. J. Craggs, Falko Riechert, Youri Meuret, Hugo Thienpont, Uli Lemmer, Guy Verschaffelt

Author Affiliations +

Proceedings Volume 7720, Semiconductor Lasers and Laser Dynamics IV; 772020 (2010) https://doi.org/10.1117/12.854427
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

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.

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Gordon M. J. Craggs, Falko Riechert, Youri Meuret, Hugo Thienpont, Uli Lemmer, and Guy Verschaffelt "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 (27 April 2010); https://doi.org/10.1117/12.854427

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