Smoothing of laser energy deposition by gas jets

D. Batani 1 R. Benocci 1 R. Dezulian 1 R. Redaelli 1 F. Canova 1 H. Stabile 1 G. Lucchini 1 Victor Malka 2 Jérôme Faure 2 M. Koenig 3 E. Krousky 4 K. Masek 4 M. Pfeifer 4 J. Skala 4 R. Dudzak 4 J. Limpouch 5 V. Tikhoncuk 6 P. Nicolai 6
1 Dipartimento di Fisica G. Occhialini, Università di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
2 LOA - Laboratoire d'optique appliquée
3 LULI - Laboratoire pour l'utilisation des lasers intenses
4 PALS Research Centre, Za Slovankou 3, 18221 Prague 8, Czech Republic
5 CTU - Czech Technical University in Prague
6 Centre Lasers Intenses et Applications, Université Bordeaux 1, 33405 Talence, France
Abstract : Smoothing of laser beam non-uniformities using gas jets has been studied. The experiment has been performed with the PALS laser working at 0.44 ?m with an intensity of about 1015 W/cm2. The laser beam has been split in two by a prism thus creating an artificial large-scale non-uniformity (?90 ?m). We recorded time resolved and static images of laser-gas jet interaction with and without an Al target. Multi 1D and 2D simulations show that such interaction acts redistributing the over-intensities over larger surface. This effect has to be attributed to ionization processes with consequent laser beam refraction. Results show that Argon gas jet produces a strong refraction of the laser beam thus strongly reducing the initial two spots separation. © EDP Sciences and Springer 2009.
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D. Batani, R. Benocci, R. Dezulian, R. Redaelli, F. Canova, et al.. Smoothing of laser energy deposition by gas jets. The European Physical Journal. Special Topics, EDP Sciences, 2009, 175 (1), pp.65-70. ⟨10.1140/epjst/e2009-01119-2⟩. ⟨hal-00964913⟩

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