Short Wavelength FELs

The generation of coherent ultraviolet and shorter wave-length light is presently limited to synchrotron sources. The recent progress in the development of brighter electron beams enables the use of much lower energy electron rf linacs to reach short-wavelengths than previously considered possible. This paper will summarize the present results obtained with synchro-tron sources, review proposed short-wavelength FEL designs and then present anew design which is capable of over an order of magnitude higher power in the extreme ultraviolet. increased power requirements have driven research into the use of free-electron lasers for the generation of short wavelength light. I E24% I