Proceedings PaperExtension of Free-Electron Lasers into the Extreme Ultraviolet
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Encouraged by experimental operation of free-electron lasers in the visible to far-infrared, several research centers are now designing and/or building devices to extend into the vacuum-ultraviolet and soft x-ray regions below 100 nm, collectively referred to as the extreme ultraviolet. Here, the peak- and average-power output of FEL oscillators and amplifiers should surpass the capabilities of any existing, continuously tunable photon sources by many orders of magnitude. These devices are certain to greatly enhance the future research capabilities of a number of scientific disciplines and industrial applications beyond those possible with synchrotron light sources. We review the features and output parameters of several of these active or proposed programs and the technological challenges that must be met to guarantee their success.