ABSTRACT
When a laser irradiates a medium, the laser magnetic field BL cos!Lt (together with the associated electric field) is propagating into the plasma, part of it is reflected and the other part is absorbed. The laser magnetic field amplitude and its frequency are given by
BLðGaussÞ ¼ 9:2 106
IL
1016 W=cm2
!L ðs1Þ ¼ 2c
L ¼ 1:88 1015
mm L
ð8:1Þ
where IL is the laser energy flux and L is the laser wavelength. !L sets the scale for high-frequency phenomena. The period of one laser oscillation (2=!L) is about 3.3 fs for a laser with a wavelength of 1 mm. The propagation of electromagnetic field in plasma was calculated in chapter 5. There are also high-frequency magnetic fields associated with the stimulated Brillouin and Raman scattering discussed in chapter 6.
