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Scheme of electron levels in three coupled quantum wells. and —bottom and upper transition levels, respectively; L–L-valley, —L-valley related level; —photon energy; –L-valley leakage activation energy.
Conduction band diagram of the active region of the QCL at 80 K. Solid curves represent the moduli squared of the relevant electron wave functions. Dotted lines correspond to levels associated with the L-valley (l) calculated using a –L separation value of 0.73 eV.
(a) Voltage-current and light-current characteristics of a QCL at different temperatures measured in pulsed mode (10 kHz, 100 ns). Inset shows emission spectrum at 80 K (100 kHz, 30 ns). (b) Voltage-current and light-current characteristics of a QCL with HR coating at different temperatures measured in pulsed mode (10 kHz, 100 ns).
Temperature dependence of the threshold current density of QCLs with uncoated and HR-coated facets. Insets show emission spectra of a QCL with HR coating at 80 and 175 K.
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