title: Subkilohertz linewidth room-temperature mid-infrared quantum cascade laser using a molecular sub-Doppler reference.
abstract: We report on the narrowing of a room-temperature mid-IR quantum cascade laser by frequency locking it to a CO2 sub-Doppler transition obtained by polarization spectroscopy. A locking bandwidth of 250 kHz has been achieved. The laser linewidth is narrowed by more than two orders of magnitude below 1 kHz, and its absolute frequency is stabilized at the same level.
authors.affiliation: CNR-INO-Istituto Nazionale di Ottica, Firenze 50125, Italy. francesco.cappelli@ino.it
authors.forename: F
authors.initials: F
authors.lastname: Cappelli
authors.forename: I
authors.initials: I
authors.lastname: Galli
authors.forename: S
authors.initials: S
authors.lastname: Borri
authors.forename: G
authors.initials: G
authors.lastname: Giusfredi
authors.forename: P
authors.initials: P
authors.lastname: Cancio
authors.forename: D
authors.initials: D
authors.lastname: Mazzotti
authors.forename: A
authors.initials: A
authors.lastname: Montori
authors.forename: N
authors.initials: N
authors.lastname: Akikusa
authors.forename: M
authors.initials: M
authors.lastname: Yamanishi
authors.forename: S
authors.initials: S
authors.lastname: Bartalini
authors.forename: P
authors.initials: P
authors.lastname: De Natale