Open AccessTowards optimal control with shaped soft-x-ray light
Author(s) -
Thomas Pfeifer,
Robert Spitzenpfeil,
Dominik Walter,
Carsten Winterfeldt,
Frank Dimler,
G. Gerber,
Christian Spielmann
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.003409
Subject(s) - optics , femtosecond , laser , pulse shaping , high harmonic generation , coherent control , materials science , photoionization , soft x rays , physics , ionization , ion , quantum mechanics
We demonstrate the first example of a closed-loop adaptive control experiment in the soft-x-ray spectral region. The branching ratio of the dissociative photoionization of sulfur hexafluoride (SF(6)) can be maximized and minimized by applying tailored soft-x-ray femtosecond light fields. The spectrally shaped coherent soft-x-ray pulses are produced by high-harmonic generation driven by phase-shaped femtosecond laser pulses. The stability of the shaped high-harmonic output is high enough to perform adaptive control experiments, albeit its strong nonlinear dependence on the driving laser pulse shape. This experiment opens the door to the application of pulse-shaping and coherent-control techniques in the soft-x-ray range.