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Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs

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. Green open access

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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 > 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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