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Proceedings Paper

Mixed metal dielectric gratings for pulse compression applications
Author(s): J. Néauport; S. Palmier; N. Bonod; E. Lavastre; N. Baclet; G. Dupuy
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Paper 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.

Paper Details

Date Published: 31 December 2009
PDF: 9 pages
Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75040R (31 December 2009); doi: 10.1117/12.836063
Show Author Affiliations
J. Néauport, CEA CESTA (France)
S. Palmier, CEA CESTA (France)
N. Bonod, Institut Fresnel, CNRS, Univ. Aix Marseille (France)
E. Lavastre, CEA CESTA (France)
N. Baclet, CEA LITEN (France)
G. Dupuy, CEA CESTA (France)


Published in SPIE Proceedings Vol. 7504:
Laser-Induced Damage in Optical Materials: 2009
Gregory J. Exarhos; Vitaly E. Gruzdev; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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