Scientific Results

Versatile mid-infrared frequency-comb referenced sub-Doppler spectrometer

Year: 2018

Authors: Gambetta A., Vicentini E., Coluccelli N., Wang Y., Fernandez TT., Maddaloni P., De Natale P., Castrillo A., Gianfrani L., Laporta P., Galzerano G.

Autors Affiliation: Dipartimento di Fisica-Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy; Istituto di Fotonica e Nanotecnologie-CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy; CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy; INFN, Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M. S. Angelo, Via Cintia, 80126 Napoli, Italy; CNR-INO, Istituto Nazionale di Ottica, Largo Enrico Fermi 6, 50125 Firenze, Italy; Dipartimento di Matematica e Fisica-Universit`a degli Studi della Campania
“Luigi Vanvitelli,” Viale Lincoln 5, 81100 Caserta, Italy

Abstract: We present a mid-IR high-precision spectrometer capable of performing accurate Doppler-free measurements with absolute calibration of the optical axis and high signal-to-noise ratio. The system is based on a widely tunable mid-IR offset-free frequency comb and a Quantum-Cascade-Laser (QCL). The QCL emission frequency is offset locked to one of the comb teeth to provide absolute-frequency calibration, spectral-narrowing, and accurate fine frequency tuning. Both the comb repetition frequency and QCL-comb offset frequency can be modulated to provide, respectively, slow- and fast-frequency-calibrated scanning capabilities. The characterisation of the spectrometer is demonstrated by recording sub-Doppler saturated absorption features of the CHF3 molecule at around 8.6 micron with a maximum signal-to-noise ratio of 7e103 in 10 s integration time, frequency-resolution of 160 kHz, and accuracy of less than 10 kHz.

Journal/Review: APL PHOTONICS

Volume: 3 (4)      Pages from: 046103-1  to: 046103-9

More Information: – The authors acknowledge financial support from the Italian Ministry of University and Research, FIRB Project No. RBFR1006TZ, and ELI Nuclear Physics (ELI-NP) infrastructure.
KeyWords: Calibration; Quantum cascade lasers; Spectrometers, Absolute calibration; Emission frequency; Frequency resolutions; High signal-to-noise ratio; Mid-infrared frequency combs; Repetition frequency; Saturated absorptions; Spectral narrowing, Signal to noise ratio; optical frequency comb; fluoroform
DOI: 10.1063/1.5025135

Citations: 3
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-24
References taken from IsiWeb of Knowledge: (subscribers only)
Connecting to view paper tab on IsiWeb: Click here
Connecting to view citations from IsiWeb: Click here

This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more