Variable Numerical-Aperture Temporal-Coherence Measurement of Resonant-Cavity LEDs
نویسندگان
چکیده
The first interferometric measurements of temporalcoherence 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 m to 32 m) reduced by 37% for a 0.42 increase in NA. For a larger range of NA (0–1), this would give coherence lengths (10 m–40 m) lying in the gap between that of conventional LEDs ( 5 m) and superluminescent diodes ( 60 m).
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