SEDL / STP / STP1015-EB / STP18753S

Multifacet, Metal Mirror Design for Extreme-Ultraviolet and Soft X-Ray Free-Electron Laser Resonators

Newnam, BE
Los Alamos National Laboratory, Los Alamos, New Mexico

Pages: 9    Published: Jan 1988

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Abstract

Resonator mirrors with reflectance greater than ~40% are required if free-electron laser (FEL) oscillators are to be extended to wavelengths below 100 nm. The principle of total-external reflection has been used to design multifacet mirrors of several metal films that surpass this requirement between 10 and 100 nm. These reflectors have high reflectance over a relatively broad band which suits well the inherent FEL wavelength tunability. The practical limitations to achieving and maintaining high reflectance include oxide- and carbon-contamination, scattering, and surface-plasmon absorption.