Coutinho, RC;
Selviah, DR;
Oulton, RF;
Gray, JW;
Stavrinou, PN;
Griffiths, HD;
Parry, G;
(2003)
Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs.
J LIGHTWAVE TECHNOL
, 21
(1)
149 - 154.
10.1109/JLT.2003.809130.
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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 mum to 32 mum) reduced by 37% for a 0.42 increase in NA. For a larger range of NA (0-1), this would give coherence lengths (10 mum-40 mum) lying in the gap between that of conventional LEDs (similar to5 mum) and superluminescent diodes (similar to60 mum).
| Type: | Article |
|---|---|
| Title: | Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/JLT.2003.809130 |
| Keywords: | coherence modulation, light-emitting diodes, modal noise, optical-coherence length, optical spectra, temporal coherence, LIGHT-EMITTING-DIODES, VCSELS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/2665 |
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