title: Highly efficient 1 GHz repetition-frequency femtosecond Yb3+:KY(WO4)2 laser.
abstract: We present a highly efficient, diode-pumped, femtosecond Yb3+:KY(WO4)2 (Yb:KYW) laser operating at a 1.024 GHz repetition rate. The output was centered at a wavelength of 1042 nm and had a bandwidth of 3.8 nm, leading to transform-limited pulses with durations of 278 fs determined by fringe-resolved autocorrelation measurements. The optical-to-optical conversion efficiency and slope efficiency were 61% and 69%, respectively, and the relative intensity noise was <0.1%.
authors.affiliation: Scottish Universities Physics Alliance (SUPA), School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh, UK. tcs2@hw.ac.uk
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Schratwieser
authors.forename: Christopher G
authors.initials: CG
authors.lastname: Leburn
authors.forename: Derryck T
authors.initials: DT
authors.lastname: Reid