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Calculated conduction band profile of the active region for the QCL under investigation for zero bias condition. The moduli squared of the relevant wave functions are shown. The layer thicknesses in nanometers for one period of active region, starting from the injection barrier, are: . Bold typeface refers to barriers and normal font to quantum wells. The lasing transition is e4-e3.
Transmission spectra for InP-based QCL measured through the waveguide for the TE and TM polarization at room temperature and zero device bias.
Low-temperature transmission spectra measured through the waveguide for TM polarization for the current densities : 1–0, 2–0.7, 3–3.7, 4–37, 5–75, 6–150, 7–225, 8–300, 9–377, 10–453, 11–490, 12–528. The curve numbers start from the bottom and the spectra are vertically shifted for clarity. The arrows indicate the positions of the intersubband transitions in the QCL active region. The inset shows e3-e4 transition peak intensity versus current density.
Transmission spectra for the QCL with increased thermal resistance measured through the waveguide for TM polarization. All spectra are taken at current density of . The temperature of the cryostat cold finger is increased from . The measured temperature of the laser ridge changes from . The spectra are vertically shifted for clarity. The arrows indicate the positions of the intersubband transitions in the QCL active region.
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