Free Electron and Cyclotron Resonance Distributed Feedback Lasers and Masers.
Patent, Filed 18 Mar 81, patented 28 Apr 87,
DEPARTMENT OF THE NAVY WASHINGTON DC
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Free-electron lasers and masers are modified by eliminating the resonator cavity as such. The feedback mechanism, essential to oscillation, is distributed through and integrated with the transmission line which guides the electromagnetic wave at the active region where interaction with the electron beam takes place. The feedback structure is created by perturbations in the transmission line along the length thereof at the locations of the zero electric field lines of a desired oscillatory standing wave mode. The perturbations may take the form of axial, helical, and azimuthal deformation of the transmission line.
- Lasers and Masers