The phase sensitivity of the atomic ionization by intense one-cycle linearly polarized laser pulses is discussed within the analytic Landau–Dykhne approximation. The generalized Keldysh parameter is introduced for analysis of two regimes of ionization. In the case of super-intense laser field we found that ionization by cosine waveform pulse is much more effective than that by sine waveform pulse with the same energy in the pulse. This is a pure quantum destructive interference effect. Electron energy spectra and effective electron temperatures are also derived analytically for both waveform pulses.
The general peculiarities of electron motion in the skin layer at the irradiation of overdense plasma by a superintense linearly polarized laser pulse of femtosecond duration are considered. The quiver electron energy is assumed to be a relativistic quantity. Relativistic electron drift along the propagation of laser radiation produced by a magnetic part of a laser field remains after the end of the laser pulse, unlike the relativistic drift of a free electron in underdense plasma. As a result, the penetration depth is much larger than the classical skin depth. The conclusion has been made that the drift velocity is a nonrelativistic quantity even at the peak laser intensity of 10(21) W/cm(2). The time at which an electron penetrates into field-free matter from the skin layer is much less than the pulse duration.
We consider the negative mobility of electrons in diamond excited by a picosecond laser pulse at low temperatures, due to the inelastic electron-phonon collisions. For the first time the dependence of the deformation potential on the phonon wave number has been taken into account. This dependence changes significantly the region of the negative electron mobility as a function of the phonon temperature.
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