title: All-electrical frequency noise reduction and linewidth narrowing in quantum cascade lasers.
abstract: A novel all-electrical method of frequency noise reduction in quantum cascade lasers (QCLs) is proposed. Electrical current through the laser was continuously adjusted to compensate for fluctuations of the laser internal resistance, which led to an active stabilization of the optical emission frequency. A reduction of the linewidth from 1.7 MHz in the standard constant current mode of operation down to 480 kHz is demonstrated at 10-ms observation time when applying this method to a QCL emitting at 7.9 μm.
authors.forename: Ilia
authors.initials: I
authors.lastname: Sergachev
authors.forename: Richard
authors.initials: R
authors.lastname: Maulini
authors.forename: Alfredo
authors.initials: A
authors.lastname: Bismuto
authors.forename: Stéphane
authors.initials: S
authors.lastname: Blaser
authors.forename: Tobias
authors.initials: T
authors.lastname: Gresch
authors.forename: Yves
authors.initials: Y
authors.lastname: Bidaux
authors.forename: Antoine
authors.initials: A
authors.lastname: Müller
authors.forename: Stéphane
authors.initials: S
authors.lastname: Schilt
authors.forename: Thomas
authors.initials: T
authors.lastname: Südmeyer