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.
|Number of pages||5|
|Journal||IEEE Journal of Selected Topics in Quantum Electronics|
|Early online date||1 Dec 2016|
|Publication status||Published - Jul 2017|
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Funding: EUFP7-ICT (FAST-DOT Project No. 224338 and NEXPRESSO program; RFBR (16-07-01166a); and EPSRC (EP/H015795/1).
- laser tuning
- optical mixers
- photoconductive devices
- quantum dots
- semiconductor lasers
- terahertz radiation