Journal
ELECTRONICS LETTERS
Volume 51, Issue 12, Pages 919-920Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/el.2015.1137
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Funding
- EPSRC (UK) 'COTS' programme
- ERC
- NERC (UK)
- CEOI (UK)
- European Space Agency
- Royal Society
- Wolfson Foundation
- EPSRC (UK)
- EPSRC [EP/J002356/1, EP/J017671/1] Funding Source: UKRI
- NERC [NE/L012375/1, NE/L01243X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J002356/1, EP/J017671/1] Funding Source: researchfish
- Natural Environment Research Council [NE/L012375/1, NE/L01243X/1] Funding Source: researchfish
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Terahertz-frequency quantum cascade lasers (THz QCLs) have numerous potential applications as 1-5 THz radiation sources in space science, biomedical and industrial sensing scenarios. However, the key obstacles to their wide-scale adoption outside laboratory environments have included their poor far-field beam quality and the lack of mechanically robust schemes that allow integration of QCLs with THz waveguides, mixers and other system components. A block integration scheme is presented, in which a continuous-wave similar to 3.4 THz double-metal QCL is bonded into a precision-machined rectangular waveguide within a copper heat-sink block. This highly reproducible approach provides a single-lobed far-field beam profile with a divergence of less than or similar to 20 degrees, and with no significant degradation in threshold current or in the range of operating temperatures.
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