Abstract
Attosecond streaking with broadband SXR continua leads to contributions from multiple overlapping lines in the photoelectron spectrum. The Volkov-transform generalized projection algorithm (VTGPA) is generalised to include all contributing photoelectron bands (multi-line VTGPA) for the reconstruction of ultra-broadband SXR continua. We further investigate the influence of the collection angle of photoelectron detectors on attosecond streaking spectrograms and show full reconstruction for angle-integrated streaking traces. Also, the effects of the photoionization dipole matrix elements on the reconstruction are demonstrated.
Highlights
Attosecond metrology had been limited to Ti:Sa lasers combined with an active stabilization of the carrier-envelope phase (CEP), where the achievable photon energy was limited to ~100 eV
To obtain the highest temporal resolution in a pump-probe experiment, the attosecond pulses synthesized from a SXR supercontinua and the mid-infrared pulses have to be carefully characterized
The amplitude of the input pulse is given in blue together with the retrieved amplitudes including and neglecting the photoemission matrix elements (PMEs) and shows a very good agreement with the input pulse parameters
Summary
Attosecond metrology had been limited to Ti:Sa lasers combined with an active stabilization of the carrier-envelope phase (CEP), where the achievable photon energy was limited to ~100 eV. The quadratic scaling of the ponderomotive energy with wavelength enables to generate photon energies in the soft-X-ray (SXR) domain with MIR laser sources.
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