title: Mode-locked ytterbium fiber lasers.
abstract: A compact fiber laser is demonstrated with use of a Gires-Tournois compensator and a short length (2-4 cm-long) of highly doped ytterbium (Yb) fiber providing net anomalous group-velocity dispersion. With use of a novel semiconductor saturable absorber mirror based on GaInNAs structure, self-started 1.5-ps-pulse mode-locked operation was obtained at 1023 nm with a repetition rate of 95 MHz. A mode-locked Yb-doped fiber laser was developed without the use of any dispersion compensation technique. Overall group-velocity dispersion was minimized by using a short length of highly doped Yb fiber in a compact amplifying loop cavity. Self-started mode-locked operation was obtained in 980-1030-nm wavelength range with a fundamental repetition rate of 140 MHz.
authors.affiliation: Optoelectronics Research Centre, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland. lasse.orsila@orc.tut.fi
authors.forename: Lasse
authors.initials: L
authors.lastname: Orsila
authors.forename: Luís A
authors.initials: LA
authors.lastname: Gomes
authors.forename: Ning
authors.initials: N
authors.lastname: Xiang
authors.forename: Tomi
authors.initials: T
authors.lastname: Jouhti
authors.forename: Oleg G
authors.initials: OG
authors.lastname: Okhotnikov