STUDY OF SERRATED APERTURE FOR A CASSEGRAIN BOOSTER AMPLIFIER

The upgrade of the actual large laser facilities (GEKKO XII in our cas e) implies an increase of filling-factor, but avoiding the generation of spatial high frequencies. To reach that purpose we intend to constr uct the beams using serrated apertures with an optimised shape. The pe rformances of our system led after simulation to a 70% filling factor with less than 2% fluctuation on the laser pattern intensity map. The optimisation was also checked from a financial point of view. The usua l serrated apertures are already giving good results, so we attached o urselves to seek for financial efficiency.