Abstract-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

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-20-4985

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${\mathrm{H}}_2\mathrm{S}$) and methanol (CH3OH${\mathrm{CH}}_3\mathrm{OH}$) around 1.073 THz. Ultimately, the spectrometer will enable to cover the 1–4 THz region in 5 GHz windows at Doppler resolution.

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