Developments of terahertz quantum cascade lasers in NICT

We fabricated terahertz quantum cascade lasers (THz-QCL) using a resonant LO phonon depopulation scheme, which were made of both GaAs/AlGaAs material system and GaSb/AlSb material system. The GaAs/AlGaAs THz-QCL has successfully demonstrated a high peak power (~ few tens of milliwatts) operation and a high operating temperature (~123K). We also report research activities of the THz-QCL in NICT.