Abstract
The Orsay free-electron laser (FEL) has a round-trip gain of the order of several times 10−4 (Ref. 1) due to the limited straight-section length available on the ACO storage ring and to the available electron density. The oscillation experiment requires the use of extraordinarily low-loss mirrors. Much experience exists in the fabrication and measurement of TiO2SiO2 multilayer dielectric mirrors, and the reflectivity which has been obtained at 630 mm (R~99.99%) is sufficient for oscillation of the FEL. To insure minimum cavity losses (high cavity Q), the mirrors are placed in the ultrahigh vacuum of the storage ring without windows. Here they have to withstand the strong UV and VUV undulator radiation2 emitted by a typical current of 100 mA of 150~24O-MeV electrons.
© 1983 Optical Society of America
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