Room-Temperature Continuous-Wave Frequency-Referenced Spectrometer up to 7.5 THz

Year: 2018

Authors: De Regis M., Bartalini S., Ravaro M., Calonico D., De Natale P., Consolino L.

Autors Affiliation: CNR, INO, Largo E Fermi 6, I-50125 Florence, Italy; European Lab Nonlinear Spect, LENS, Via N Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; Ist Nazl Ric Metrol INRIM, Str Caccie 6, I-10135 Turin, Italy.

Abstract: The lack of coherent room-temperature sources in the whole terahertz spectral window (0.3-10 THz) has significantly hampered the growth of scientific and technological applications in this range. Among them, high-precision frequency measurements of molecular transitions play a central role but remain an open challenge. Here, room-temperature generation and detection of continuous-wave, broadly tunable, narrow-linewidth THz radiation are presented, and their application to high-resolution spectroscopy in the broad 1-7.5 THz spectral range is demonstrated. This result has been achieved by implementing a Cherenkov phase-matching scheme into a channel waveguide in a nonlinear crystal. This simple approach, entirely based on robust telecom technology, unprecedently merges in a single source an ultra-broad continuous-wave spectral coverage and a state-of-the-art accuracy (approximately 10(-9)) in molecular-transition-center determination.

Journal/Review: PHYSICAL REVIEW APPLIED

Volume: 10 (6)      Pages from: 64041-1  to: 64041-11

More Information: The authors would like to acknowledge support from a European Union FET-Open Grant no. 665158 Ultrashort Pulse Generation from Terahertz Quantum Cascade Lasers-ULTRAQCL Project, the European ESFRI Roadmap Extreme Light Infrastructure-ELI Project, and the European Commission-H2020 Laserlab-Europe, EC Grant No. 654148.
KeyWords: Far-infrared Spectroscopy; Optical Rectification; Lithium-niobate; Generation; Pulses; Laser; Bulk; Spectrum
DOI: 10.1103/PhysRevApplied.10.064041

Citations: 13
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