Industrial mJ-class all-fiber front end with spatially coherent top-hat beam output used as seeder for high power laser

摘要

In large scale laser facility dedicated to laser-matter interaction including inertial confinement fusion, such as LMJ or NIF, high-energy main amplifier is injected by a laser source in which the beam parameters must be controlled. However, compactness, long term stability, versatility and ease of use capabilities are important advantages of fiber lasers and amplifiers over bulky systems. So, for many years, the CEA has developed nano-joule pulses all-fiber front end sources, based on the telecommunications fiber optics technologies. Thanks to these technologies, we have been able to precisely control temporal shaping and phase-modulated pulse. The limitation of our LMJ system, which has been implemented since years, is the very low energy per pulse.