论文信息 - Mixed metal dielectric pulse compression gratings

Mixed metal dielectric pulse compression gratings

A Petawatt facility called PETAL (PETawatt Aquitaine Laser) is under development near the LIL (Ligne d'Integration Laser) at CEA Cesta, France. PETAL facility uses chirped pulse amplification (CPA) technique. This system needs large pulse compression grating exhibiting damage threshold of more than 4 J/cm2 normal beam at 1.053μm and for 500fs pulses. In this paper, we study an alternative design to the classic multilayer dielectric (MLD) grating called "mixed metal-multilayer dielectric grating" (MMLD). This design consists in a gold reflective layer coated with a few pairs of HfO2/SiO2. The top low index SiO2 layer of the stack is then engraved to receive the grating. We evidenced in a previous work that leads to high efficient pulse compression gratings. We have shown in last Boulder Damage Symposium that mixed mirror is equivalent to a "classic" MLD mirror. We herein detail the damage performances obtained on the MMLD gratings and compare them with these of MLD gratings.

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