The Super-ACO Free-Electron Laser (FEL) has been operated around 350 nm first at 600 MeV and more recently in June 1992 at 700 and 800 MeV, which is the highest energy for an FEL. Because of the energy increase, the laser lifetime is greater than ten hours and the output power has been enhanced by two orders of magnitude. In addition, with its good temporal stability, it appears to be a possible tool for users.
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Couprie et al. (1993) studied this question.
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