Abstract

We present a new scheme of X-ray free electron laser, based on the interaction between a moderately relativistic electron bunch, and a transverse high intensity optical lattice. Gain scaling laws in the small signal regime are derived analytically, and confirmed from Particle-In-Cell simulations. The nature of amplification and saturation are discussed. The resulting all-optical Raman X-ray laser opens perspectives for ultra-compact X-ray coherent light sources.

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