Metering the absolute phase of a few-cycle pulse via its high-order above-threshold ionization spectrum
✍ Scribed by D.B. Milošević; G.G. Paulus; W. Becker
- Book ID
- 102448411
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 389 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
The influence of the carrier-envelope phase ("absolute phase") of a few-cycle pulse on the left-right asymmetry of the photoelectron spectrum of high-order above-threshold ionization is analyzed. Energy spectra are calculated for opposite detectors along the polarization axis of a linearly polarized four-cycle laser pulse. The results obtained allow us to determine the value of the absolute phase in a given experiment by comparison with the theoretical spectra. A classical analysis of the calculated spectra is presented, and the corresponding electron trajectories are analyzed. Emission of high-energy electrons is found to occur in one or two ultrashort subfemtosecond bursts. 0 10 20 30 40 50 60 70 80 E p f (eV) 10 -14 10 -11 10 -8 Ionization probability / T p (a.u.) θ =0 o θ =180 o Probability of above-threshold ionization of krypton by a Ti:Sa 4-cycle sine-square pulse with intensity 10 14 W/cm 2 as a function of the electron energy. The absolute phase is φ = 0 • , and the spectra are for the two detector positions θ = 0 • (dashed curve) and θ = 180 • (solid curve) opposite each other along the polarization axis of the laser field