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Far-Field Nonmodal Laser Emission for Low-Speckle Laser Projection

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6 Author(s)
Riechert, F. ; Light Technol. Inst., Univ. Karlsruhe, Karlsruhe, Germany ; Craggs, G. ; Meuret, Y. ; Thienpont, H.
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In this letter, we discuss how the nonmodal emission regime's far field of a broad-area vertical-cavity surface-emitting laser (BA-VCSEL) can be used for low-speckle laser projection. A microlens beam homogenizer is used to exploit the low spatial coherence of the VCSEL's far field in the nonmodal emission regime. Using far-field instead of near-field illumination of the homogenizer has some important advantages for a practical projection system: the field emitted by the VCSEL can be directly projected onto the homogenizer without the need for additional lenses or accurate alignment. Speckle contrast values as low as 2.5% are measured and in good agreement with modeled contrast values.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 20 )

Date of Publication:

Oct.15, 2009

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