title: Widely tunable soliton frequency shifting of few-cycle laser pulses.
abstract: Photonic-crystal fibers are employed to demonstrate widely tunable frequency down-conversion of unamplified 6-fs Ti:sapphire laser pulses through the soliton self-frequency shift induced by the Raman effect. Wavelength shifts as large as 500 nm are achieved for input few-cycle pulses with broadband spectra centered at approximately 820 nm. The central wavelength of the redshifted output of a photonic-crystal fiber is smoothly tuned from the low-frequency edge in the spectrum of the 6-fs Ti:sapphire laser pulse up to 1.35 microm by varying the input energy in the fundamental mode of the fiber.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Ishii
authors.forename: C Y
authors.initials: CY
authors.lastname: Teisset
authors.forename: S
authors.initials: S
authors.lastname: Köhler
authors.forename: E E
authors.initials: EE
authors.lastname: Serebryannikov
authors.forename: T
authors.initials: T
authors.lastname: Fuji
authors.forename: T
authors.initials: T
authors.lastname: Metzger
authors.forename: F
authors.initials: F
authors.lastname: Krausz
authors.forename: A
authors.initials: A
authors.lastname: Baltuska
authors.forename: A M
authors.initials: AM
authors.lastname: Zheltikov