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Titolo:
SPECTROSCOPIC EVIDENCE FOR DIFFERENT LASER GAIN MECHANISMS IN OPTICALLY PUMPED ZNCDS ZNS QUANTUM-WELL STRUCTURES/
Autore:
CHEN P; NICHOLLS JE; ONEILL M; STIMER T; HOGG JHC; LUNN B; ASHENFORD DE;
Indirizzi:
UNIV HULL,DEPT PHYS KINGSTON HULL HU6 7RX N HUMBERSIDE ENGLAND UNIV HULL,DEPT ENGN DESIGN & MANUFACTURE KINGSTON HULL HU6 7RX N HUMBERSIDE ENGLAND
Titolo Testata:
Journal of applied physics
fascicolo: 10, volume: 84, anno: 1998,
pagine: 5621 - 5625
SICI:
0021-8979(1998)84:10<5621:SEFDLG>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRAVIOLET STIMULATED-EMISSION; LASING MECHANISM; EXCITONIC GAIN; CUBIC ZNS; LUMINESCENCE; BIEXCITONS; GAP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
P. Chen et al., "SPECTROSCOPIC EVIDENCE FOR DIFFERENT LASER GAIN MECHANISMS IN OPTICALLY PUMPED ZNCDS ZNS QUANTUM-WELL STRUCTURES/", Journal of applied physics, 84(10), 1998, pp. 5621-5625

Abstract

The role of biexcitons has been studied in two optically pumped quantum well (QW) structures of Zn1-xCdxS/ZnS, one with 18% Cd concentration and the other with 3% in the wells. For the x = 18% QW structure, high excitation photoluminescence and stimulated emission indicate that the laser gain mechanism involves biexcitons. For the x = 3% QWs, eventhough biexcitons are clearly observed in the spontaneous emission, they are not responsible for laser gain in this structure. Instead exciton-exciton scattering may be the more likely mechanism responsible for laser gain close to threshold, while at higher densities an estimateof the carrier density indicates an electron-hole plasma as the likely source of optical gain. The different mechanisms in the two cases can, very likely, be attributed to one of differing degrees of localization both within the QW and at alloy fluctuations. (C) 1998 American Institute of Physics. [S0021-8979(98)00922-0].

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Documento generato il 04/04/20 alle ore 21:43:51