Abstract

An image-relayed corner-cube ring free electron laser (FEL) resonator has been investigated theoretically and experimentally. The laser beam is outcoupled from the resonator by using an annular 'scraper' mirror which is image-relayed to the FEL wiggler by two intracavity telescopes of unequal magnifications. The resulting FEL resonator has significant advantages over both conventional and grazing incidence resonators owing to drastically reduced mirror alignment tolerances together with the achievement of good mode control.

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