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

Year: 2017

Authors: Insero G., Borri S., Calonico D., Cancio Pastor P., Clivati C., D’Ambrosio D., De Natale P., Inguscio M., Levi F., Santambrogio G.

Autors Affiliation: CNR, Ist Nazl Ott, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Florence, Dipartimento Fis & Astron, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; European Lab Non Linear Spect LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Ist Nazl Fis Nucl, Sez Firenze, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Ist Nazl Ric Metrol INRIM, Str Cacce 91, I-10135 Turin, Italy.

Abstract: High-resolution spectroscopy in the 1-10 mu m 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 mu m 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 mu m with 11 digits of precision.

Journal/Review: SCIENTIFIC REPORTS

Volume: 7      Pages from: 12780-1  to: 12780-7

More Information: This work was supported by INFN under the SUPREMO project, and by EMPIR-15SIB05-OFTEN, which has received funding from the EMPIR programme co-financed by the Participating States and from the European Union
DOI: 10.1038/s41598-017-12891-6

ImpactFactor: 4.122
Citations: 24
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