electric field E, the effective work done by laser field to accelerate a hot electron is
evaluated to be over only one wavelength. Then, the energy one electron can get is
T h $ À
eE 0
k
¼ mc
2 a 0
ð6:8:11Þ
Note that (6.8.11) is the same as the ponderomotive scaling (6.7.10) in the relativistic
limit, where the velocity of electrons is assumed v ~ c ¼ ω/k.
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6 Relativistic Laser Plasma Interactions