title: Absolute frequency spectroscopy of CO2 lines at around 2.09 μm by combined use of an Er:fiber comb and a Ho:YLF amplifier.
abstract: The low-frequency tail of an octave-spanning supercontinuum (SC) generated by an Er:fiber comb is enhanced by a multipass Ho:YLF amplifier and used in a sum-frequency-generation scheme to obtain absolute referencing of a single-mode Tm-Ho:YAG laser tunable around 2.09 μm. By tuning the comb repetition frequency, the probing laser is scanned across the absorption lines of a CO(2) gas sample and highly accurate absorption profiles are measured. This approach can be readily scaled to any wavelength above ~2 μm.
authors.affiliation: Dipartimento di Fisica—Politecnico di Milano and Istituto di Fotonica e Nanotecnologie—CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy. nicola.coluccelli@polimi.it
authors.forename: D
authors.initials: D
authors.lastname: Gatti
authors.forename: N
authors.initials: N
authors.lastname: Coluccelli
authors.forename: A
authors.initials: A
authors.lastname: Gambetta
authors.forename: A
authors.initials: A
authors.lastname: Di Lieto
authors.forename: M
authors.initials: M
authors.lastname: Tonelli
authors.forename: G
authors.initials: G
authors.lastname: Galzerano
authors.forename: P
authors.initials: P
authors.lastname: Laporta
authors.forename: M
authors.initials: M
authors.lastname: Marangoni