Planar free-electron lasers with combined 1D/2D Bragg mirror resonators: Atheoretical study

The operation of a free-electron laser with a combined Bragg mirror resonat or is studied theoretically. The resonator comprises a pair of planar Bragg reflectors with a two- and a one-dimensional relief pattern, respectively, and is closed in the transverse direction so as to ensure unidirectional o utcoupling. It is demonstrated that this design provides for a possibility of obtaining spatially coherent radiation from a sheet electron stream with the cross size exceeding the wavelength by several orders of magnitude. (C ) 2000 MAIK "Nauka/Interperiodica".