Optimized serrated apertures for a Cassegrain three pass amplifier

Beam quality : To increase the filling factor of a laser beam pattern, avoiding generation of high spatial-frequencies, we intend to use serrated aperture for which we optimized the shape. This paper starts with a theoretical approach of the serration effects. This study has given us the method to reach very high filling factor up to 86% with less than 2 % contrast on the laser intensity pattern.