Production Of Coherent Light In The VUV By Harmonic Generation In A Relativistic Electron (Or Positron) Beam

The first part of this paper recalls the experiments of "Coherent Harmonic Generation" that have been performed with the "Optical Klystron" installed on the ACO storage ring at Orsay. Coherent radiation in the VUV is produced, inside the Optical Klystron, by the particle beam when it is "bunched" by an incident laser field. In the second part, we present the sytem that is operating on the new positron storage ring SuperACO. It is constitued by a mode-lock Q-switch doubled Nd-Yag laser (200MW/532nm at 10Hz) focused in the optical klystron, and by a measurement device (ultra-vacuum monochromator). The tunability of the wavelength is also planned by using a dye laser. The first experiments will start in spring 1989.