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Saturated absorption in a rotational molecular transition at 2.5 THz using a quantum cascade laser

  Articoli su Riviste JCR/ISI  (anno 2015)

Autori:  Consolino L., Campa A., Ravaro M., Mazzotti D., Vitiello M. S., Bartalini S., De Natale P

Affiliazione Autori:  Istituto Nazionale di Ottica (INO) - CNR, Largo E. Fermi 6, Firenze 50125, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), Via N. Carrara 1, Sesto Fiorentino 50019, Italy NEST, Istituto Nanoscienze - CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, 56127, Italy

Riassunto:  We report on the evidence of saturation effects in a rotational transition of CH3OH around 2.5 THz, induced by a free-running continuous-wave quantum cascade laser (QCL). The QCL emission is used for direct-absorption spectroscopy experiments, allowing to study the dependence of the absorption coefficient on gas pressure and laser intensity. A saturation intensity of 25 mu W/mm(2), for a gas pressure of 17 mu bar, is measured. This result represents the initial step towards the implementation of a QCL-based high-resolution sub-Doppler THz spectroscopy, which is expected to improve by orders of magnitude the precision of THz spectrometers. (C) 2015 AIP Publishing LLC.

Rivista/Giornale:  APPLIED PHYSICS LETTERS
Volume n.:  106      Pagine da: 021108-1  a: 021108-4
Ulteriori informazioni:  This work was partly supported by the Italian Ministry of Education, University, and Research (MIUR) through the program FIRB-Futuro in Ricerca 2010, RBFR10LULP; Laserlab-Europe, Grant Agreement No, 284464, EU 7th Framework Program; ESFRI Roadmap, Extreme Light Infrastructure (ELI) project.
DOI: 10.1063/1.4905872

*Impact Factor della Rivista: (2015) 3.142   *Citazioni: 12
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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