Narrow Bandwidth Gamma Comb from Nonlinear Compton Scattering Using the Polarization Gating Technique

Nonlinear Compton scattering is a promising source of bright gamma-rays. Using readily available intense laser pulses to scatter off the energetic electrons on one hand allows significantly increase total photon yield, but other leads dramatic spectral broadening fundamental emission line as well its harmonics due pulse shape induced ponderomotive effects. In this paper we propose avoid in by using polarization gating technique - well-known method construct with temporally varying polarization. We show that restricting harmonic only region near peak pulse, where linear, it possible generate narrow bandwidth comb gamma region.