Phys. Rev. Lett. 59, 202–205 (1987)Radiation focusing and guiding with application to the free electron laserReceived 8 October 1986; published in the issue dated 13 July 1987 In the free-electron laser the interaction between the radiation and electrons can result in radiation focusing. The radiation tends to follow the electron beam when the centroid of the electron beam is laterally displaced. Spatial modulation of the electron-beam envelope induces a similar modulation in the radiation-beam envelope. These and other phenomena are studied by use of a novel source-dependent modal representation of the fully three-dimensional radiation field. Among the merits of this approach is that few modes are needed to describe the radiation accurately. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.59.202
DOI:
10.1103/PhysRevLett.59.202
PACS:
42.55.Tb
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