Intersubband stimulated emission in GaAs/AlGaAs quantum wells: Pump-probe experiments using a two-color free-electron laser
作者:
O. Gauthier-Lafaye,
S. Sauvage,
P. Boucaud,
F. H. Julien,
R. Prazeres,
F. Glotin,
J.-M. Ortega,
V. Thierry-Mieg,
R. Planel,
J.-P. Leburton,
V. Berger,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 24
页码: 3197-3199
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119125
出版商: AIP
数据来源: AIP
摘要:
Intersubband stimulated emission under optical pumping has been observed in the conduction band of GaAs–AlGaAs quantum wells. The asymmetric coupled quantum wells which exhibit three conduction bound levels are designed to exhibit population inversion under optical pumping. An optical excitation at&lgr;=9.2 &mgr;mis used to bleach the absorption between the ground and second excited subband. The population inversion between excited subbands is pumped and probed on a picosecond time scale by a tunable two-color free-electron laser. The stimulated amplification is studied at low temperature in infrared waveguides as a function of the waveguide length and of the probe wavelength. A stimulated gain≈80 cm−1is measured at 12.5 &mgr;m in agreement with calculations. ©1997 American Institute of Physics.
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