Abstract

The first interferometric measurements of temporal-coherence length variation with numerical aperture (NA) are described for 650 nm, resonant-cavity light-emitting diodes (LEDs) agreeing with spectrally derived results. The interferometrically measured coherence length (22 µm to 32 µm) reduced by 37% for a 0.42 increase in NA. For a larger range of NA (0-1), this would give coherence lengths (10 µm - 40µm) lying in the gap between that of conventional LEDs (∼5µm) and superluminescent diodes (∼60µm).

[IEEE ]

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