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We investigate the broadening and compression of high average power near-infrared pulses from a Yb:KGW laser amplifier that undergo self-phase modulation in a series of thin fused silica plates. The efficiency of the technique is investigated through spectral and temporal characterization of the broadened pulses.
We developed a method to stabilize the carrier-envelope phase of a 20 TW Ti:Sapphire laser operating at 10 Hz. Phase-dependent features were observed in the high-order harmonic spectrum generated using Generalized Double Optical Gating.
An XUV continuum supporting 280 as isolated attosecond pulses is generated in argon with a 200 mJ, 17 fs Ti:Sapphire laser using the GDOG technique. The energy of the XUV pulse is over 100 nJ at generation location.
The dynamics of helium 1snp excited states in an intense, few-cycle laser pulse are probed using isolated attosecond pulses in a transient absorption scheme. In addition to the dynamic Stark shift, we observe half-cycle oscillations.
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.
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