Ultrafast phase-resolved pump-probe measurements on a quantum cascade laser

Kuehn, W.; Parz, W.; Gaal, P.; Reimann, K.; Woerner, M.; Elsaesser, T.; Müller, T.; Darmo, J.; Unterrainer, K.; Austerer, M.; Strasser, G.; Wilson, L. R.; Cockburn, J. W.; Krysa, A. B.; Roberts, J. S.
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p151106
Academic Journal
The dynamics of optical gain in an InGaAs/AlInAs quantum cascade laser is studied in midinfrared pump-probe measurements. Pump and probe pulses of identical wavelength, polarization, and propagation direction through the laser waveguide are detected separately by electro-optic sampling. For injection currents below the lasing threshold, we observe an absorption decrease in the laser transition with a ≈3 ps recovery time. Above threshold, the gain strongly saturates and shows a fast recovery time decreasing with current. Such kinetics is superimposed by oscillations with a frequency of 0.8 THz originating from coherent electron tunneling through the injection barrier.


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