X-Ray Amplification from a Raman Free-Electron Laser

Abstract

We demonstrate that a mm-scale free-electron laser can operate in the x-ray range, in the interaction between a moderately relativistic electron bunch, and a transverse high intensity optical lattice. The corrugated light-induced ponderomotive potential acts simultaneously as a guide and as a low-frequency wiggler, triggering stimulated Raman scattering. The gain law in the small signal regime is derived in a fluid approach, and confirmed from particle-in-cell simulations. We describe the nature of bunching, and discuss the saturation properties. The resulting all-optical Raman x-ray laser opens perspectives for ultracompact coherent light sources up to the hard x-ray range.

Betatron emission from relativistic electrons in a high intensity optical lattice

“…Thanks to the flexibility of the setup, OLBE can complement the existing diagnostics providing more information on the electron bunch, a crucial point in view of the numerous upcoming applications of laser-accelerated electron beams. This technique may also be used to infer the interaction conditions in view of triggering or optimizing the Raman x-ray free-electron laser process [24].…”

“…We have recently proposed another process of x-ray generation coupling relativistic electrons and intense laser pulses: the Raman x-ray free-electron laser [23,24]. The conceptual scheme is shown in Fig.…”

Advanced Channeling Technologies in Plasma and Laser Fields

“…Kapitza and Dirac were the first who referred to the electron dynamics in such an interference field in well known paper [95] evaluating for the first time the electron beam diffraction in periodical field of an optical lattice. Since that many papers have been published proposing a tool for monitoring the electron beam size [96], a new-type free electron laser with optical undulator [97][98][99][100][101], a novel channeling radiation source [102][103][104][105] as well as several works clarifying processes taking place at interaction of charged beams in various periodical optical systems [106][107][108]. Practically all those papers have been dedicated to the particle dynamics in the field of two laser beams.…”

Orbital angular momentum of a π-pulse emission by dense relativistic cold electron beam

“…In order to reach this objective, many authors have suggested the use of an intense laser field as the wiggler in substitution to the static magnetic wiggler array. In the optical wiggler configuration, a counter propagating laser field interacts with a relativistic electron beam through the stimulated scattering mechanism such that an induced stimulated intense radiation is emitted by the FEL system [2,3].…”