GaAs quantum wells are simultaneously illuminated with near-infrared (NIR) radiation at frequency and intense far-infrared (FIR) radiation from a free-electron laser at Magnetic fields up to 9 T are applied. Strong and narrow sidebands are observed at The intensity of the sidebands is enhanced when either or is near the onset of NIR absorption in the quantum well, or when is near the free-electron cyclotron frequency. We attribute these sidebands to four-wave mixing of NIR and FIR photons whose energies differ by more than a factor of 100.
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© 1997 American Institute of Physics.
1997
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