Thermoelectrically cooled THz quantum cascade laser operating up to 210 K

• Published in: Applied physics letters Vol. 115; no. 1
• Main Authors: Bosco, L., Franckié, M., Scalari, G., Beck, M., Wacker, A., Faist, J.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 01-07-2019
• Subjects: Annan elektroteknik och elektronik; Annan fysik; Applied physics; Cryogenic temperature; Electrical Engineering, Electronic Engineering, Information Engineering; Elektroteknik och elektronik; Engineering and Technology; Fysik; Green's functions; High temperature; Laser cooling; Lasers; Natural Sciences; Naturvetenskap; Optimization; Other Electrical Engineering, Electronic Engineering, Information Engineering; Other Physics Topics; Physical Sciences; Quantum cascade lasers; Quantum wells; Teknik; Thermoelectric cooling
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.5110305

We present a terahertz quantum cascade laser operating on a thermoelectric cooler up to a record-high temperature of 210.5 K. 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 (∼40 K), a maximum output power of 200 mW was measured.