Abstract
Since its first demonstration in 1976 the free-electron laser has evolved rapidly, producing coherent radiation over a spectral range extending from the millimeter to the ultraviolet. Recent establishment of user facilities is enabling its use as an investigative tool in a number of scientific disciplines. Its ability to generate tuneable, high power radiation over a wide range of wavelengths interests medical, industrial and military users. However, exploiting the many features of this intrinsically high power laser poses new challenges in optical resonator design. We review significant advances in optical resonators for free-electron lasers including the influence of this peculiar gain medium on resonator designs.
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