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- W3126757174 abstract "ABSTRACT We present experiments measuring the complex degree of coherence of a Broad-Area Vertical-Cavity Surface-Emitting Laser (BA-VCSEL) when it is driven into a regime of spatially incoherent emission. This high-power,spatially incoherent emission regime is quite uncommon for semiconductor lasers but can be useful in e.g. il-lumination and projection systems, as the low degree of spatial coherence may help to reduce speckle. Thenear-eld coherence properties are measured for dierent positions in the VCSELs aperture using a 180 degreesreversing-wavefront Michelson interferometer. We give evidence that the coherence area is much smaller thanthe VCSELs aperture and that the intensity uctuations across the coherence area are small, therefore allowingthe BA-VCSEL to be considered a quasi-homogeneous source. We explain the reason for the relatively smallcoherence radius of about 1 .4 µ m based on the mode size in a planar cavity together with the thermal gradientwithin the VCSEL aperture." @default.
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- W3126757174 date "2008-01-01" @default.
- W3126757174 modified "2023-10-04" @default.
- W3126757174 title "Coherence radius and mode size of a broad-area Vertical-Cavity Surface-Emitting Laser in the incoherent emission regime" @default.
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