Wide band free electron laser with variable phase and frequency

Details Wide band free electron laser with variable phase and frequency Wide band free electron laser with variable phase and frequency

1987-10-26

1989-04-04

Sikes, William L.

Coherent light generators

Free electron laser

372 24, 372 37, 372 74, 315 3, 315 4, H01S 310

Patent

active

048192384

ABSTRACT:
A free electron laser (FEL) is disclosed in which the phase of the output electromagnetic beam is inherently adjustable without the use of any extraneous optical phase shifting materials. This is accomplished by implementing the FEL as a pair of series-connected wiggler cavity sections, and varying the relative phases of the bunched electron flow in the first cavity section relative to the second. In a preferred embodiment a series of electrodes are provided in a transition region between the two cavity sections, and variable voltages are applied to the electrodes to electrostatically control the electron transit time through the transition region, and the electron velocity upon exiting from that region. This translates into a control over phase and frequency. Alternate embodiments are described in which electromagnets replace the electrodes, and in which the cavity sections are pumped with electromagnetic wiggler waves with the phase of the second cavity pump wave controlled to vary the phase relative to the bunched electron beam. The phase and frequency control can be utilized in an array of such FELs to steer and control the width of the beam emitted by the array.

REFERENCES:
patent: 3315117 (1967-04-01), Udelson
patent: 3916255 (1975-10-01), Crandall
patent: 4438513 (1984-03-01), Elias et al.
patent: 4571726 (1986-02-01), Wortman et al.
patent: 4590596 (1986-05-01), Wortman et al.
patent: 4599724 (1986-07-01), McMullin
patent: 4696815 (1987-10-01), Bhowmik et al.

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