Femtosecond degenerate four-wave mixing in 500 &mgr;m undoped GaAs and 350 &mgr;m undoped InP far below band gap
作者:
Sungkyu Yu,
Dongho Kim,
D. S. Kim,
Y. H. Lee,
Y. H. Cho,
B. D. Choe,
Jong Hyun Lee,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 81,
issue 10
页码: 6928-6933
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.365237
出版商: AIP
数据来源: AIP
摘要:
Rather strong third- and fifth-order four-wave mixing (FWM) signals from a 500 &mgr;m thick undoped GaAs and a 350 &mgr;m thick undoped InP in detuning ranges of 80–170 meV below the band gap are observed. The spectrally resolved (SR) FWM signals for both samples far below the band gap are blue-shifted significantly with respect to the spectrum of the excitation laser pulse for negative time delays, whereas they are red-shifted for positive time delays. The temporal and spectral shapes of the FWM signals for both samples far below the band gap are nearly consistent with those of the excitation laser pulse but are remarkably different from the excitonic properties. The shifts of SR-FWM signals far below the band gap are interpreted as due to the instantaneously created virtual states by the temporal overlap of the excitation laser pulses. ©1997 American Institute of Physics.
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