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What defines the quantum regime of the free-electron laser?

2015; IOP Publishing; Volume: 17; Issue: 12 Linguagem: Inglês

10.1088/1367-2630/17/12/123019

1367-2630

Peter Kling, Enno Giese, Rainer Endrich, Paul Preiss, R. Sauerbrey, Wolfgang P. Schleich,

Advanced X-ray Imaging Techniques

The quantum regime of the free-electron laser (FEL) emerges when the discreteness of the momentum of the electron plays a dominant role in the interaction with the laser and the wiggler field. Motivated by a heuristic phase space approach we pursue two different routes to define the transition from the classical FEL to the quantum domain: (i) standard perturbation theory and (ii) the method of averaging. Moreover, we discuss the experimental requirements for realizing a Quantum FEL and connect them to today's capabilities.