Near-perfect diffraction grating rhomb

Details Near-perfect diffraction grating rhomb Near-perfect diffraction grating rhomb

1989-06-30

1990-12-11

Lee, John D.

Coherent light generators

Free electron laser

372102, H01S 300

Patent

active

049775600

ABSTRACT:
A near-perfect grating rhomb enables an output beam to be diffracted to an angle offset from the input beam. The correcting grating is tipped relative to the dispersing grating to provide the offset angle. The correcting grating is further provided with a groove spacing which differs from the dispersing grating groove space by an amount effective to substantially remove angular dispersion in the output beam. A near-perfect grating rhomb has the capability for selective placement in a FEL to suppress sideband instabilities arising from the FEL.

REFERENCES:
patent: 3675154 (1972-07-01), Duguay et al.
patent: 4287486 (1981-09-01), Javan
patent: 4748629 (1988-05-01), Edlin et al.
patent: 4845718 (1989-07-01), Pistoresi
German; "Diffraction Grating Tuners for CW Lasers"; Applied Optics; vol. 18, No. 14; Jul. 1979; pp. 2348, 2349.
E. A. Treacy, "Optical Pulse Compression with Diffraction Gratings," IEEE J. of Quantum Electron, vol. QE-5, No. 6, pp. 454-458, (Sep. 1969).
R. L. Tokar et al., "Sideband Suppression in Free-Electron Lasers Using a Grating Rhomb," IEEE J. of Quantum Electronics, vol. 24, No. 6, pp. 856-863, (Jun. 1988).

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