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We have investigated the time-resolved vibrational properties of terahertzquantum cascade lasers by means of ultra-fast laser spectroscopy. By theobservation of the acoustic folded branches, and by analyzing the involvedphonon modes it is possible to extract accurate structural information of thesedevices, which are essential for their design and performance.

Observation of Zone-Folded Acoustic Phonons in Terahertz Quantum Cascade Lasers using Picosecond Ultrasonics