Mixed metal dielectric gratings for pulse compression applications

J. Néauport; S. Palmier; N. Bonod; E. Lavastre; N. Baclet; G. Dupuy

doi:10.1117/12.836063

31 December 2009 Mixed metal dielectric gratings for pulse compression applications

J. Néauport, S. Palmier, N. Bonod, E. Lavastre, N. Baclet, G. Dupuy

Proceedings Volume 7504, Laser-Induced Damage in Optical Materials: 2009; 75040R (2009) https://doi.org/10.1117/12.836063
Event: Laser Damage Symposium XLI: Annual Symposium on Optical Materials for High Power Lasers, 2009, Boulder, Colorado, United States

Abstract

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 [1]. This system needs large pulse compression gratings exhibiting damage threshold of more than 4 J/cm² beam normal at 1.053μm and for 500fs pulses. In this paper, we study an alternative design to the classic Multidielectric (MLD) gratings [2] called "mixed metal-multidielectric grating" (MMLD). In this design, the dielectric mirror stack of the MLD grating is replaced by a gold reflective layer covered with a few pairs of HfO₂/SiO₂ [3]. The number of pairs must be high enough to ensure a sufficient reflection coefficient in order to prevent damage of the gold layer. On the top of the stack, a silica layer is coated to receive the grating. After some considerations on the grating design and optimization, a comparison between MLD and MMLD mirrors is also carried out. We finally detail the measured diffraction efficiencies obtained on MMLD gratings.

Citation Download Citation

J. Néauport, S. Palmier, N. Bonod, E. Lavastre, N. Baclet, and G. Dupuy "Mixed metal dielectric gratings for pulse compression applications", Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040R (31 December 2009); https://doi.org/10.1117/12.836063

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