High-resolution spectroscopy in the 1-10 μm region has never been fully tackled for the lack of widely-tunable and practical light sources. Indeed, all solutions proposed thus far suffer from at least one of three issues: they are feasible only in a narrow spectral range; the power available for spectroscopy is limited; the frequency accuracy is poor. Here, we present a setup for high-resolution spectroscopy, whose approach can be applied in the whole 1-10 μm range. It combines the power of quantum cascade lasers (QCLs) and the accuracy achievable by difference frequency generation using an orientation patterned GaP crystal. The frequency is measured against a primary frequency standard using the Italian metrological fibre link network. We demonstrate the performance of the setup by measuring a vibrational transition in a highly-excited metastable state of CO around 6 μm with 11 digits of precision.

Measuring molecular frequencies in the 1-10 μm range at 11-digits accuracy / Insero, G; Borri, S; Calonico, D; Pastor, P Cancio; Clivati, C; D'Ambrosio, D; De Natale, P; Inguscio, M; Levi, F; Santambrogio, G. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - 7:1(2017), p. 12780. [10.1038/s41598-017-12891-6]

Measuring molecular frequencies in the 1-10 μm range at 11-digits accuracy

Calonico, D;Clivati, C;Inguscio, M;Levi, F;Santambrogio, G
2017

Abstract

High-resolution spectroscopy in the 1-10 μm region has never been fully tackled for the lack of widely-tunable and practical light sources. Indeed, all solutions proposed thus far suffer from at least one of three issues: they are feasible only in a narrow spectral range; the power available for spectroscopy is limited; the frequency accuracy is poor. Here, we present a setup for high-resolution spectroscopy, whose approach can be applied in the whole 1-10 μm range. It combines the power of quantum cascade lasers (QCLs) and the accuracy achievable by difference frequency generation using an orientation patterned GaP crystal. The frequency is measured against a primary frequency standard using the Italian metrological fibre link network. We demonstrate the performance of the setup by measuring a vibrational transition in a highly-excited metastable state of CO around 6 μm with 11 digits of precision.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/57391
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