Gain dynamics in a heterogeneous terahertz quantum cascade laser

Christian G. Derntl, Giacomo Scalari, Dominic Bachmann, Mattias Beck, Jérome Faist & Karl Unterrainer
The gain recovery time of a heterogeneous active region terahertz quantum cascade laser is studied by terahertz-pump-terahertz-probe spectroscopy. The investigated active region, which is based on a bound-to-continuum optical transition with an optical phonon assisted extraction, exhibits a gain recovery time in the range of 34–50 ps dependent on the operation condition of the laser. The recovery time gets shorter for stronger pumping of the laser while the recovery dynamics slows down with increasing operation...
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