Compact all-quantum-dot-based tunable THz laser source

Ksenia A. Fedorova*, Andrei Gorodetsky, Edik U. Rafailov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We demonstrate an ultracompact, room temperature, tunable terahertz (THz) generating laser source based on difference-frequency-driven photomixing in a coplanar stripline InAs/GaAs quantum-dot (QD) antenna pumped by a broadly tunable, high power, continuous wave InAs/GaAs QD laser diode in the double-grating quasi-Littrow configuration. The dual-wavelength QD laser operating in the 1150- 1301 nm wavelength region with a maximum output power of 280 mW and with tunable difference-frequency (277 GHz to 30 THz) was used to achieve tunable THz generation in the QD antenna with a photoconductive gap of 50 μm. The best THz output performance was observed at pump wavelengths around the first excited state of the InAs/GaAs QDs (∼1160 nm), where a maximum output power of 0.6 nW at 0.83 THz was demonstrated.

Original languageEnglish
Article number1900305
Number of pages5
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number4
Early online date1 Dec 2016
Publication statusPublished - Jul 2017

Bibliographical note

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Funding: EUFP7-ICT (FAST-DOT Project No. 224338 and NEXPRESSO program; RFBR (16-07-01166a); and EPSRC (EP/H015795/1).


  • antennas
  • laser tuning
  • optical mixers
  • photoconductive devices
  • quantum dots
  • semiconductor lasers
  • terahertz radiation


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