title: Whispering-gallery-mode-resonator-stabilized narrow-linewidth fiber loop laser.
abstract: We demonstrate a narrow-line fiber loop laser using erbium-doped fiber as the gain material, stabilized by using a microsphere as a transmissive frequency selective element. Stable lasing with a linewidth of 170 kHz is observed, limited by the experimental spectral resolution. A linear increase in output power and a redshift of the lasing mode were also observed with increasing pump power. Its potential applications are discussed.
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: L J
authors.initials: LJ
authors.lastname: Wang