Physics – Optics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ijqe...25.2322k&link_type=abstract
IEEE Journal of Quantum Electronics (ISSN 0018-9197), vol. 25, Nov. 1989, p. 2322-2326.
Physics
Optics
Free Electron Lasers, Grazing Incidence Telescopes, Laser Modes, Optical Resonators, Ring Lasers, Gratings (Spectra), Wiggler Magnets
Scientific paper
The power extraction and lowest-order transverse-mode structure of a free-electron ring laser with hyperboloid-paraboloid grazing-incidence telescopes are studied as a function of the method used to outcouple the beam. Four different resonator configurations, with various outcoupling and intracavity optics, are modeled using an FEL wave-optics computer code. A stable ring with a diffraction-grating outcoupler gives better power extraction and transverse-mode structure than unstable rings with scrapers, which outcouple either an annular ring or a central spot. Efforts to reshape the intracavity beam after scraper outcoupling (in order to improve interaction with the electron beam in the wiggler) do not produce power extraction equivalent to that of the stable ring.
Cover Ralph A.
Kennedy Paul K.
Labbe Ross H.
Sun Kenneth C.
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