Abstract
Laser-induced damage threshold of gratings remains the main limiting factor towards generating higher-energy compressed pulses (terawatt and petawatt). HORIBA Jobin Yvon has first developed the manufacturing of large gold coated gratings, dimensions up to half a meter. Then we have developed large multilayer dielectric (MLD) gratings for working at 1.053 microns with 2 to 3 times higher damage threshold than gold coated gratings for ps pulses, and higher efficiency (up to 96% averaged over the full aperture). In addition these large MLD gratings are optimised for mosaic (tiling) configurations, in which the total useful grating length may reach 1 meter or more.
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