title: Multiplying the repetition rate of passive mode-locked femtosecond lasers by an intracavity flat surface with low reflectivity.
abstract: By inserting a low-reflectivity flat surface inside the oscillator cavity, we demonstrate a flexible and phase-insensitive method for multiplying the repetition rate of a femtosecond passive mode-locked solid-state laser. Without mode matching and feedback control, we successfully multiplied the repetition rate of a passively mode-locked Cr:forsterite laser from 124 MHz to 1.24 GHz. High-repetition-rate femtosecond optical pulses with average power of >100 mW can be obtained with the demonstrated method.
authors.affiliation: Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Tzu-Ming
authors.initials: TM
authors.lastname: Liu
authors.forename: Franz X
authors.initials: FX
authors.lastname: Kärtner
authors.forename: James G
authors.initials: JG
authors.lastname: Fujimoto
authors.forename: Chi-Kuang
authors.initials: CK
authors.lastname: Sun