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Q: Quantenoptik
Q 29: Application of Short Pulses II
Q 29.6: Talk
Thursday, April 5, 2001, 19:00–19:15, H 2013
Spectral broadening of light from a femtosecond laser in a microstructure fiber — •Nils Haverkamp1, Jörn Stenger1, Harald Telle1, and Robert S. Windeler2 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig — 2Lucent Technologies, Murray Hill, New Jersey, USA
The spectrum emitted by a Kerr-lens mode-locked femtosecond laser can efficiently be broadened in a microstructure fiber by self-phase modulation and incoherent scattering processes. We measured spectra as function of fiber length, power and chirp of the 10 fs pulses from our Ti:sapphire laser. Whereas the spectrum is symmetrically broadened in short pieces of fiber, as expected from pure self-phase modulation without self-steepening, asymmetric spectra arise in long fibers. Additionally we measured the pulse-to-pulse phase coherence via fringe visibility in a Michelson interferometer. We discuss the broadening mechanisms in the microstructure fiber as well as the coherence properties.