Delay interferometric single-shot measurement of a petawatt-class laser longitudinal chromatism corrector

International audienceIn this paper we present a self-referenced interferometric single-shot measurement technique that we use to evaluate the longitudinal chromatism compensation made by a diffractive lens corrector. A diffractive lens with a delay of 1 ps is qualified for a 60 mm beam aperture. This corrector was implemented on the Alisé Nd:glass power chain. We qualify the corrector and the Alisé power chain chromatism, demonstrating the potential of this measuring principle as well as the interest of diffractive lenses to correct longitudinal chromatism of petawatt-class lasers

Chromatism compensation of the PETAL multipetawatt high-energy laser

International audienceHigh-energy petawatt lasers use series of spatial filters in their amplification section. The refractive lenses employed introduce longitudinal chromatism that can spatially and temporally distort the ultra-fast laser beam after focusing. To ensure optimum performances of petawatt laser facilities, these distortions need to be corrected. Several solutions using reflective, refractive, or diffractive optical components can be addressed. We give herein a review of these various possibilities with their application to the PETAL (Petawatt Aquitaine Laser at the Laser Integration Line facility) laser beamline and show that diffractive-based corrections appear to be the most promising

Beam-focus shaping by use of programmable phase-only filters: application to an ultralong focal line

International audienc

Contrôle spatial de la focalisation des lasers de puissance

A l'aide d'une boucle d'optique adaptative basée sur une valve électro-optique adressée optiquement, nous pouvons maîtriser la répartition de l'intensité lumineuse au foyer d'une lentille. Nous l'avons appliquée pour augmenter la qualité de focalisation de notre chaîne 100-TW mais aussi afin d'obtenir une focalisation selon une ligne de long de l'axe optique

Efficient generation of narrow-bandwidth picosecond pulses by frequency doubling of femtosecond chirped pulses

International audienceWe demonstrate efficient generation of picosecond narrow-bandwidth pulses by frequency mixing of broadband opposite chirped pulses in a type I doubling crystal. This procedure allows us to produce picosecond pulses that are perfectly synchronized with femtosecond pulses. The experiment shows a decrease of the initial bandwidth by a factor of more than 30, while a high conversion efficiency is maintaine

Synthetic aperture compression scheme for multi-petawatt high energy laser

An original synthetic aperture compressor scheme is proposed for multi-kilojoule petawatt beam. This scheme uses two compressor stages with multi-dielectric gratings allowing suppressing the mosaic of gratings. The main technical issues are detailed

Superfluorescent highly doped neodymium materials as smooth sources for fusion lasers

SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RM 1028 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc