High efficiency transmission diffractive grating and grating lens of the Megajoule laser final optic assembly

Abstract

The French Megajoule laser facility (LMJ) is designed to provide 1,8MJ/600TW of UV light on an X-ray drive target. This performance requirements are given by inertial confinement fusion ignition mission. The LMJ laser will have 30 bundles of 4x2 IR phosphate-glass amplifier chains of 40 cm square aperture. In the target area this bundles are split into 2x2 bundles which are called ≪ quads ≫. These quads are directed around the target chamber, converted into UV light and focused on the target.