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: Istituto Nazionale di Ottica-CNR (INO), Largo E. Fermi 6, Firenze, I-50125, Italy; LENS, European Laboratory for Nonlinear Spectroscopy, Via N. Carrara 1, Sesto Fiorentino (FI), I-50019, Italy; Istituto Nazionale di Ricerca Metrologica (INRIM), Strada delle Caccie 6, Torino, I-10135, 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.


Volume: 10 (6)      Pages from: 064041-1  to: 064041-11

KeyWords: Far-infrared spectroscopy; Optical rectification; Lithium-niobate; Generation; Pulses; Laser; Bulk; Spectrum
DOI: 10.1103/PhysRevApplied.10.064041

Citations: 11
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