Journal
PHYSICAL REVIEW X
Volume 4, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.4.021006
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Funding
- Italian Ministry of Education, University, and Research (MIUR) through the program FIRB-Futuro in Ricerca RBFR10LULP fundamental research on terahertz photonic devices
- Extreme Light Infrastructure (ELI) EU roadmap project
- LASERLAB-EUROPE (EC) [284464]
- Engineering and Physical Sciences Research Council [EP/J017671/1] Funding Source: researchfish
- EPSRC [EP/J017671/1] Funding Source: UKRI
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We report a metrological-grade THz spectroscopy based on the combination of a THz frequency-comb synthesizer (FCS) and a THz quantum cascade laser (QCL). The QCL, emitting at 2.5 THz, is phase locked to the free-space THz FCS, and its frequency is swept across a methanol transition by tuning the comb-repetition rate, which is ultimately disciplined by the Cs primary frequency standard. The absolute frequency scale provides an uncertainty of a few parts in 10(-11) on the laser frequency and 10(-9) on the line-center determination, ranking this technique among the most precise ever developed in the THz range.
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