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Saturation of intersubband transitions in -doped quantum wells
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View: Figures


Image of FIG. 1.
FIG. 1.

Spectra from the two -doped samples showing their -ISBTs at , which have been fitted with Lorentzian lineshapes. The transition peaks occurred at 160(1) and , respectively. The dipole matrix elements were calculated as for the wide QWs and for the wide QWs. The inset shows a side view of the path that the light took through the sample rhomb geometry.

Image of FIG. 2.
FIG. 2.

The large temperature variance (compared with -ISBTs) of the -ISBT lineshape for the wide QW sample. The experimental Fourier spectrometer data are replicated from Ref. 2 and overlaid are theoretical absorption spectra from the model described in the text.

Image of FIG. 3.
FIG. 3.

Absorption saturation curves of the two samples’ -ISBTs. The axis shows the overall sample absorption [defined as , where is the transmission of the ISBTs] and the curve for the QW has been vertically shifted by unit for clarity. For the wide QWs, the incident light was tuned to the ISBT peak at photon energy; the theoretical fit (shown) yielded as resulting in a population relaxation time of . Likewise, the wide QW had a peak energy of , a saturation intensity of , and . The inset shows the sample absorption geometry.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Saturation of intersubband transitions in p-doped GaAs∕AlGaAs quantum wells