Reflection of electromagnetic radiation from plasma with an anisotropic electron velocity distribution

Longitudinal electron waves in plasma formed at multi‐photon ionization of atoms by a short laser pulse

“…[16], are presented. Note the fact that the curves plotted in Figures 1 and 2 are given in a wider range of wave numbers than the interval in which approximate formulas (11) and (12) are obtained. As can be seen from Figure 2, this is justified by the fact that, despite the sharp growth, the damping decrement of longitudinal wave remains small in comparison with the frequency.…”

“…Turning to the discussion of the obtained expressions for frequency (11) and damping decrement (12), we note that according to (12), the considered longitudinal waves are characterized by weak collisionless damping in a wide range of wave numbers k ≪ L /Δv. In the entire region, the last term in (11) related to the spread of photoelectron velocity distribution leads only to a small correction to the dispersion law in comparison with the first two terms, whereas the first two can compete with each other.…”

“…[1][2][3][4][5]). The anisotropy of photoelectron distribution function leads to new optical properties of photoionized plasma, [6,7] new properties of surface waves on the boundary of such plasma, [8] the possibility of aperiodic instability development, [9][10][11][12] and the amplification of low-frequency radiation. [13,14] Development of aperiodic instabilities is the reason for initial photoelectron distribution function destruction.…”