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Intersubband absorption spectra from an multi quantum well sample at and . The inset shows the sample geometry used in order to obtain intersubband coupling.
Pump-probe signal from an multi quantum well sample at taken on the absorption line in Fig. 1. inset: the temperature dependence of the relaxation time following the fit for longitudinal optical phonon scattering.
(Color online) Four wave mixing signal at and . The inset compares the square of the FTIR absorption line with the FMW intensity.
(Color online) Absorption line at and Voigt line fitting. The dashed line shows the homogeneous linewidth (Lorentzian).
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