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By probing the optical Stark shifts induced by a few-cycle laser field using isolated attosecond pulses in a transient absorption scheme, we uncover a sub-cycle-laser-induced AC Stark shift in excited states of the helium atom.
Autoionization in argon atoms was studied by transient absorption spectroscopy with isolated attosecond XUV pulses. The peak position, line shape and population of the resonant states were modified by intense near infrared laser pulses.
Carrier-envelope phase stabilization of a two-stage chirped pulse amplifier laser system with regenerative amplification as the preamplifier is demonstrated with a 90 mrad rms error for a locking period of 4.5 h.
Through FROG-CRAB based on attosecond streaking, we characterized 140 attosecond single isolated pulses generated with a double optical gating using 9 fs lasers.
The effects of streaking speed, time delay jitter, laser intensity variation and shot noise on the reconstruction of attosecond XUV pulse with PCGPA are studied.
Two-electron excitation and autoionization in helium atoms were studied experimentally using isolated attosecond pulses for the first time. The population of the resonance state was modified by intense near infrared laser pulses.
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