Free electron laser saturation spectroscopy of neutral donors and negative donor ions confined in GaAs/AlGaAs quantum wells
✍ Scribed by S.R. Ryu; G. Herold; J. Kono; M. Salib; B.D. McCombe; J. Kaminski; S.J. Allen; Jr.
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 175 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
Saturation of the D 0 1s-2p + transition, the D --singlet transition and CR has been studied in donor (Si)-doped GaAs/AlGaAs multiple-quantum-well samples by magneto-transmission and magneto-photoconductivity measurements with the UCSB free electron laser. Effective lifetimes of the D 0 1s-2p + transition were found to vary systematically with laser 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 increased by up to 40% and showed complete quenching at higher laser powers.