title: 2.1-microm lasers frequency stabilized against CO2 lines: comparison between fringe-side and frequency-modulation locking methods.
abstract: A comparison between the use of the fringe-side and the frequency-modulation methods to frequency stabilize diode-pumped Tm-Ho:YAG lasers against linear absorption lines of CO2 near 2.1 microm is reported. Frequency stability was evaluated by monitoring of the beat signal between two independently stabilized Tm-Ho:YAG systems. Frequency instability levels of approximately 20 and approximately 400 kHz for 1-s integration time were achieved by the frequency-modulation and fringe-side methods, respectively.
authors.affiliation: Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche and Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica del Politecnico di Milano, Piazza L. da Vinci 32, Milan 20133, Italy. gianluca.galzerano@fisi.polimi.it
authors.forename: Gianluca
authors.initials: G
authors.lastname: Galzerano
authors.forename: Marcello
authors.initials: M
authors.lastname: Marano
authors.forename: Stefano
authors.initials: S
authors.lastname: Taccheo
authors.forename: Paolo
authors.initials: P
authors.lastname: Laporta