FREE-ELECTRON LASER SATURATION SPECTROSCOPY OF NEUTRAL DONORS AND NEGATIVE DONOR IONS CONFINED IN GAAS ALGAAS QUANTUM-WELLS/

Authors
RYU SR HEROLD G KONO J SALIB M MCCOMBE BD KAMINSKI J ALLEN SJ
Citation
Sr. Ryu et al., FREE-ELECTRON LASER SATURATION SPECTROSCOPY OF NEUTRAL DONORS AND NEGATIVE DONOR IONS CONFINED IN GAAS ALGAAS QUANTUM-WELLS/, Superlattices and microstructures, 21(2), 1997, pp. 241-246
Citations number
19
Categorie Soggetti
Physics, Condensed Matter
Journal title
Superlattices and microstructures → ACNP
ISSN journal
07496036
Volume
21
Issue
2
Year of publication
1997
Pages
241 - 246
Database
ISI
SICI code
0749-6036(1997)21:2<241:FLSSON>2.0.ZU;2-M
Abstract
Saturation of the D-0 1s-2p(+) transition, the D--singlet transition a nd CR has been studied in donor (Si)-doped GaAs/AlGaAs multiple-quantu m-well samples by magneto-transmission and magneto-photoconductivity m easurements with the UCSB free electron laser. Effective lifetimes of the D-0 1s-2p(+) transition were found to vary systematically with las er frequency, decreasing from 62 ns at 84 cm(-1) to 3 ns at 124 cm(-1) . The absorption coefficient of the D--singlet transition initially in creased by up to 40% and showed complete quenching at higher laser pow ers. (C) 1997 Academic Press Limited