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

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Abstract

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.

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

    Rights statement: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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Details

Original languageEnglish
Article number1900305
Number of pages5
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume23
Issue number4
Early online date1 Dec 2016
DOIs
Publication statusPublished - Jul 2017

Bibliographic note

© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Funding: EUFP7-ICT (FAST-DOT Project No. 224338 and NEXPRESSO program; RFBR (16-07-01166a); and EPSRC (EP/H015795/1).

    Keywords

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

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