Berlin 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 47: Attosecond physics
A 47.4: Vortrag
Donnerstag, 20. März 2014, 17:15–17:30, BEBEL E42
Signatures of isolated attosecond pulses spanning the water window by few-cycle driven HHG — •Stephan M. Teichmann1, Francisco Silva1, Seth L. Cousin1, Michaël Hemmer1, and Jens Biegert1,2 — 1ICFO, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain — 2Institució Catalana de Recerca i Estudis Avanats, 08010 Barcelona, Spain
Excellent transmission contrast in the water window between 280 eV and 530 eV can be exploited for high resolution biological imaging. High order harmonic generation (HHG) has been demonstrated as a table-top source for fully coherent X-ray radiation. While isolated attosecond pulses, useful for pump-probe experiments on the time scale of subatomic motion, have been produced with this technique, they have thus far not been generated in the desirable water window.
Here, we present results from ponderomotively scaled HHG using 1.6 cycle, 1.8 µm wavelength pulses at a repetition rate of 1 kHz with stable carrier envelope phase (CEP). We generate harmonic spectra up to 550 eV in helium, thus spanning the entire water window with fully coherent X-rays. Moreover, control over the CEP allows us to drive the HHG process with a well-defined electric field which in turn leads to the production of half-cycle cutoffs. Simulations confirm, for the first time, the production of isolated attosecond transients across the water window up to 530 eV.