Ce. Clayton et al., PLASMA-WAVE GENERATION IN A SELF-FOCUSED CHANNEL OF A RELATIVISTICALLY INTENSE LASER-PULSE, Physical review letters, 81(1), 1998, pp. 100-103
Evidence for self-channeling of a relativistically intense laser pulse
in an underdense plasma is presented through Schlieren and 90 degrees
Thomson sidescatter images. Using collective Thomson scattering of a
probe beam, we observe that relativistically propagating plasma waves
are excited over the entire length of the channel, up to 12 Rayleigh l
engths (approximate to 4 mm). From the wave amplitude, the intensity i
nside the channel is estimated to be similar to 10(18) W/cm(2).