Broadband terahertz heterodyne spectrometer exploiting synchrotron radiation at megahertz resolution

J-F Lampin; O Pirali; Z S Buchanan; S Eliet; M-A Martin-Drumel; J Turut; P Roy; F Hindle; G Mouret

doi:10.1364/OL.44.004985

Broadband terahertz heterodyne spectrometer exploiting synchrotron radiation at megahertz resolution

Opt Lett. 2019 Oct 15;44(20):4985-4988. doi: 10.1364/OL.44.004985.

Authors

J-F Lampin, O Pirali, Z S Buchanan, S Eliet, M-A Martin-Drumel, J Turut, P Roy, F Hindle, G Mouret

PMID: 31613245
DOI: 10.1364/OL.44.004985

Abstract

A new spectrometer allowing both high resolution and broadband coverage in the terahertz (THz) domain is proposed. This instrument exploits the heterodyne technique between broadband synchrotron radiation and a quantum-cascade-laser-based molecular THz laser that acts as the local oscillator. Proof of principle for exploitation for spectroscopy is provided by the recording of molecular absorptions of hydrogen sulfide (H₂S) and methanol (CH₃OH) around 1.073 THz. Ultimately, the spectrometer will enable to cover the 1-4 THz region in 5 GHz windows at Doppler resolution.