A Scaling Law of Photoelectron Angular Distributions in One-Cycle Laser Pulses
Bai Li-Hua; Zhang Jing-Tao; Xu Zhi-Zhan; Bai Li-Hua; Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800; Zhang Jing-Tao; Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800; Xu Zhi-Zhan; Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Журнал:
Chinese Physics Letters
Дата:
2005-04-01
Аннотация:
The photoelectron angular distributions (PADs) from above-threshold ionization of atoms irradiated by one-cycle laser pulses satisfy a scaling law. The scaling law denotes that the main features of the PADs are determined by four dimensionless parameters: (1) the ponderomotive number u<sub>p</sub> = U<sub>p</sub>/ℏω, the ponderomotive energy U<sub>p</sub> in units of laser photon energy; (2) the binding number ε<sub>b</sub> = E<sub>b</sub>/ℏω, the atomic binding energy E<sub>b</sub> in units of laser photon energy; (3) the number of absorbed photons q; (4) the carrier-envelope phase φ<sub>0</sub>, the phase of the carrier wave with respect to the envelope. We verify the scaling law by theoretical analysis and numerical calculation, compared to that in long-pulse case. A possible experimental test to verify the scaling law is suggested.
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