Observation of redshifting and harmonic radiation in inverse Compton, Phys. Rev. ST Accel. Beams 18, 060702 (2015) scattering
Observed distribution of 2nd harmonic ICS radiation from a circular polarized laser field, with spectral band isolated using a 250 μm Al filter. The annular shape of the radiation distribution implies existence of a strong transverse helical motion. Image from Phys. Rev. ST Accel. Beams 18, 060702 (2015), see http://dx.doi.org/10.1103/PhysRevSTAB.18.060702 for permissions
ICSInverse Compton ScatteringUCLAY. Sakai et. al.