title: 14 GHz visible supercontinuum generation: calibration sources for astronomical spectrographs.
abstract: We report the use of a specially designed tapered photonic crystal fiber to produce a broadband optical spectrum covering the visible spectral range. The pump source is a frequency doubled Yb fiber laser operating at a repetition rate of 14 GHz and emitting sub-5 pJ pulses. We experimentally determine the optimum core diameter and achieve a 235 nm broad spectrum. Numerical simulations are used to identify the underlying mechanisms and explain spectral features. The high repetition rate makes this system a promising candidate for precision calibration of astronomical spectrographs.
authors.affiliation: Max Planck Institut for the Science of Light, Guenther-Scharowsky Str. 1, D-91058 Erlangen, Germany. Sebastian.Stark@mpl.mpg.de
authors.forename: S P
authors.initials: SP
authors.lastname: Stark
authors.forename: T
authors.initials: T
authors.lastname: Steinmetz
authors.forename: R A
authors.initials: RA
authors.lastname: Probst
authors.forename: H
authors.initials: H
authors.lastname: Hundertmark
authors.forename: T
authors.initials: T
authors.lastname: Wilken
authors.forename: T W
authors.initials: TW
authors.lastname: Hänsch
authors.forename: Th
authors.initials: T
authors.lastname: Udem
authors.forename: P St J
authors.initials: PS
authors.lastname: Russell
authors.forename: R
authors.initials: R
authors.lastname: Holzwarth