Abstract
A new method of accurately measuring the carrier-envelope phase (CEP) of few-cycle pulses is presented. The high-energy photo-electron spectrum by a few-cycle pulse is dominated by photoelectrons bursting in very few short time intervals near the maximum of the pulse envelope. For high laser intensities, the positions of interference fringes in the high-energy cutoff region are very sensitive to the CEP, which can be used to measure and stabilize the CEP precisely. The measurement precision of the CEP strongly depends on the laser intensity for the fastest photoelectrons.
Highlights
Intense few-cycle optical pulses with a pulse energy around 400 μJ and duration of 3.5 fs (measured at the full-width at half-maximum (FWHM) of their temporal intensity profile) have been generated very recently [1]
The experimental evidence of phase effects has been obtained in the left-right asymmetry of above-threshold ionization (ATI) yield [6], high-order harmonics generation (HHG) [7] and nonsequential double ionization (NSDI) [8]
The photoelectron spectra are obtained by numerically solving the 1D time-dependent Schrodinger equation (TDSE)
Summary
Intense few-cycle optical pulses with a pulse energy around 400 μJ and duration of 3.5 fs (measured at the full-width at half-maximum (FWHM) of their temporal intensity profile) have been generated very recently [1]. D. Bandrank, ”Phase-dependent asymmetries in strong-field photoionization by few-cycle laser pulses,” Phys. Krausz, ”Measurement of the Phase of Few-Cycle Laser Pulses,” Phys.
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