Abstract

Optical cavity configurations for high power free-electron lasers must simultaneously provide small spot sizes at the wiggler and large spots at the mirrors to avoid optical damage. Nearly concentric optical cavities have previously been proposed(1) to meet this requirement. However, the concentric cavity has an alignment tolerance which scales as(2)zr1/2 λ3/2m2 where zr is the Rayleigh range, λ is the wavelength, and ωm is the mirror spot size.

© 1984 Optical Society of America

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