title: CaF2 whispering-gallery-mode-resonator stabilized-narrow-linewidth laser.
abstract: A fiber laser is stabilized by introducing a calcium fluoride (CaF(2)) whispering-gallery-mode resonator as a filtering element in a ring cavity. It is set up using a semiconductor optical amplifier as a gain medium. The resonator is critically coupled through prisms, and used as a filtering element to suppress the laser linewidth. A three-cornered-hat method is used and shows a stability of 10(-11) after 10 micros. Using the self-heterodyne beat technique, the linewidth is determined to be 13 kHz. This implies an enhancement factor of 10(3) with respect to the passive cavity linewidth.
authors.affiliation: Max-Planck-Institute for the Science of Light, Günther-Scharowsky-Strasse 1, Bau 24, 91058 Erlangen, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Sprenger
authors.forename: H G L
authors.initials: HG
authors.lastname: Schwefel
authors.forename: Z H
authors.initials: ZH
authors.lastname: Lu
authors.forename: S
authors.initials: S
authors.lastname: Svitlov
authors.forename: L J
authors.initials: LJ
authors.lastname: Wang