Method and apparatus for FEL sideband suppression

Details Method and apparatus for FEL sideband suppression Method and apparatus for FEL sideband suppression

1988-06-07

1989-07-04

Scott, Jr., Leon

Coherent light generators

Free electron laser

372 25, 372 18, 372102, H01S 300

Patent

active

048457183

ABSTRACT:
In an FEL, unwanted sidebands in the laser pulses are suppressed by the introducing of a temporal dispersion of the sideband with respect to the main wavelength, causing a time lag between the main wavelength and the sideband. This is preferably accomplished by the use of diffraction gratings in a grating rhomb within a ring resonator. The first of the gratings in the rhomb has a zero order diffraction which can be used for outcoupling. Tuning in real time is achieved by adjusting the positions of the elements in the ring resonator so that the desired wavelength will be in spatial overlap with the electron pulses in the wiggler.

REFERENCES:
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patent: 3691477 (1972-09-01), Janney
patent: 4219786 (1980-08-01), Chester
patent: 4238141 (1980-12-01), Greiner
patent: 4287488 (1981-09-01), Brau et al.
patent: 4361889 (1982-11-01), Johnson
patent: 4529942 (1985-07-01), Patel et al.
patent: 4748629 (1988-05-01), Edlin et al.

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