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Moduli squared of the relevant wave functions in the QCL calculated for an applied electric field of 31 kV/cm. The laser transition occurs between states 1 and 2, is the ground state of the injector. The tunnel coupling through the injection barrier causes the splitting of 1 THz.
(a) Electric-field transients of the midinfrared pulses incident on the QCL (left part of the figure, ) and of the probe pulse transmitted through the QCL (right part, ) for a current . (b) Electric field of the probe pulse transmitted through the QCL as a function of the delay and the real time for a current .
(a) Symbols, transmission through the QCL as a function of current, normalized to the transmission for zero current (left scale). Solid line, QCL output as a function of current (right scale). (b) Pump-induced change in the transmission as a function of pump-probe delay for different currents. (c) Fourier transform of the transmission changes shown in (b). (d) Pump-induced shift of the phase of the transmitted pulse as a function of .
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