Intersubband stimulated emission in GaAs/AlGaAs quantum wells: Pump-probe experiments using a two-color free-electron laser

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

Research output: Contribution to journalArticlepeer-review

Abstract

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 λ=9.2 μm is 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 ≈80cm-1 is measured at 12.5 μm in agreement with calculations.

Original languageEnglish (US)
Pages (from-to)3197-3199
Number of pages3
JournalApplied Physics Letters
Volume70
Issue number24
DOIs
StatePublished - Jun 16 1997

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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