Thermoelectrically cooled THz quantum cascade laser operating up to 210K

We present a terahertz quantum cascade laser operating on a thermoelectric cooler up to a record-high temperature of 210.5K. The active region design is based on only two quantum wells and achieves high temperature operation thanks to a systematic optimization by means of a nonequilibrium Green's function model. Laser spectra were measured with a room temperature detector, making the whole setup cryogenic free. At low temperatures (similar to 40K), a maximum output power of 200 mW was measured. Published under license by AIP Publishing.