Free-electron laser without inversion: gain optimization and implementation scheme
We consider a scheme of two noncollinear wigglers with an intermediate magnetic drift region, constituting a free-electron laser without inversion (FELWI). Two mechanisms of phase shifts in the drift region between the wigglers owing to a series of magnetic lenses can give rise to FELWI: velocity- and angle-dependent shifts. An appropriate combination of these shifts is shown to provide the conditions for amplification without inversion. The phase shifts optimizing the gain are found. A specific scheme for the drift region is suggested.
Artemiev
AI
Department of Physics, Texas A & M University, College Station, Texas 77843-4242, USA.
Fedorov
MV
Rostovtsev
YV
Kurizki
G
Scully
MO