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We present a \MF{terahertz} quantum cascade laser operating on athermoelectric cooler up to a record-high temperature of 210.5 K. The activeregion design is based on only two quantum wells and achieves high temperatureoperation thanks to a systematic optimization by means of a nonequilibriumGreen's function model. Laser spectra were measured with a room temperaturedetector, making the whole setup cryogenic free. At low temperatures ($\sim 40K), a maximum output power of 200 mW was measured.

Thermoelectrically cooled THz quantum cascade laser operating up to 210 K