title: 100 kHz linewidth Cr2+:ZnSe ring laser tunable from 2.12 to 2.58 μm.
abstract: We demonstrate a single-frequency, room temperature Cr2+:ZnSe laser widely tunable in the mid-infrared spectral region from 2.12 to 2.58 μm. Using a compact unidirectional ring cavity configuration, we obtain a maximum output power of 160 mW with an emission linewidth of ∼100  kHz in a 1 ms observation time. As a result, we can accurately report amplitude- and frequency-noise characterizations.
authors.affiliation: Istituto di Fotonica e Nanotecnologie—CNR and Dipartimento di Fisica—Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano 20133, Italy. nicola.coluccelli@polimi.it
authors.forename: Nicola
authors.initials: N
authors.lastname: Coluccelli
authors.forename: Marco
authors.initials: M
authors.lastname: Cassinerio
authors.forename: Paolo
authors.initials: P
authors.lastname: Laporta
authors.forename: Gianluca
authors.initials: G
authors.lastname: Galzerano