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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Insero G,Borri S,Calonico D,Pastor PC,Clivati C,D'Ambrosio D,De Natale P,Inguscio M,Levi F,Santambrogio Gdoi
10.1038/s41598-017-12891-6subject
Has Abstractpub_date
2017-10-06 00:00:00pages
12780issue
1issn
2045-2322pii
10.1038/s41598-017-12891-6journal_volume
7pub_type
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