Influence of spin-laser interaction on relativistic harmonic generation

The emission of harmonic radiation by an electron oscillating anharmonicall y in a linearly polarized plane ultra-intense laser field is studied. The e lectron is described as a classical relativistic particle with a magnetic m oment in order to include the spin-laser interaction. In contrast to ordina ry Maxwell dynamics the motion can become three-dimensional depending on th e orientation of the spin. additional harmonics are visible in the directio n of the electric field of the laser where no harmonics of polarization alo ng the magnetic-field direction are to be expected.