Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs |
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| Authors: | Coutinho R.C. Selviah D.R. Oulton R.F. Gray J.W. Stavrinou P.N. Griffiths H.D. Parry G. |
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| Affiliation: | Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK; |
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| 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 /spl mu/m to 32 /spl mu/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 /spl mu/m-40 /spl mu/m) lying in the gap between that of conventional LEDs (/spl sim/5 /spl mu/m) and superluminescent diodes (/spl sim/60 /spl mu/m). |
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