Grazing incidence beam expander

Details Grazing incidence beam expander Grazing incidence beam expander

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985swco.conf.....a&link_type=abstract

Presented at the Southwest Conf. on Optics, Albuquerque, N. Mex., 4 Mar. 1985

Physics

Optics

Beams (Radiation), Free Electron Lasers, Grazing Incidence, Laser Cavities, Telescopes, Alignment, Design Analysis, Fabrication, Requirements, Sensitivity, Stability, Systems Analysis

Scientific paper

A Grazing Incidence Beam Expander (GIBE) telescope is being designed and fabricated to be used as an equivalent end mirror in a long laser resonator cavity. The design requirements for this GIBE flow down from a generic Free Electron Laser (FEL) resonator. The nature of the FEL gain volume (a thin, pencil-like, on-axis region) dictates that the output beam be very small. Such a thin beam with the high power levels characteristic of FELs would have to travel perhaps hundreds of meters or more before expanding enough to allow reflection from cooled mirrors. A GIBE, on the other hand, would allow placing these optics closer to the gain region and thus reduces the cavity lengths substantially. Results are presented relating to optical and mechanical design, alignment sensitivity analysis, radius of curvature analysis, laser cavity stability analysis of a linear stable concentric laser cavity with a GIBE. Fabrication details of the GIBE are also given.

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