Место издания:Paul Scherrer Institute Zürich, Switzerland
Первая страница:181
Последняя страница:182
Аннотация:We demonstrate and exploit the longitudinal coherence of two-colour extreme ultraviolet
(XUV) light from the FERMI seeded Free Electron Laser (FEL). The phase difference
between two wavelengths was controlled by an electron delay line, installed between
undulators emitting different colours, with 3 attoseconds resolution. Interference as a
function of relative phase was observed between two ionization pathways, one-photon
ionization by the second harmonic and two-photon ionization by the first harmonic. We
also propose another novel scheme of interference which utilizes the full coherence of
FERMI FEL.