Spatial distributions of the electron density (normalized by ) and the longitudinal electric field (normalized by ) at for the plasma density scalelength and the incident laser parameters , , and . (a) and (b) correspond to (c) and (d) correspond to .
Time (normalized by ) evolution of the electron density (normalized by ) along the direction at for the same parameters as in Fig. 1(a).
Absorption rate vs the incident laser peak amplitude under different conditions: (a) and (b) for different density scalelengths along with and , (c) for different laser durations along with and , and (d) for different focal spot sizes along with and . Absorption rates in (a), (c), and (d) are calculated by with Re as the reflected energy flux, Tr as the transmitted energy flux, and In as the incident energy flux. (b) shows the increase in kinetic energy of all electrons divided by . The optimized incident angles corresponding to , , and are calculated to be 17.0°, 21.6°, and 27.7°, respectively.
Reflected-light spectra (arbitrary units) for , , , , and . (a) , (b) , and (c) .
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