Scientific Results

Non-adiabatic cluster expansion after ultrashort laser interaction

Year: 2008

Authors: Faenov A.Ya., Magunov A.I., Pikuz T.A., Skobelev I.Yu., Giulietti D., Betti S., Galimberti M., Gamucci A., Giulietti A., Gizzi LA., Labate L., Levato T., Tomassini P., Marques J.R., Bourgeois N., Dufrenoy S.D., Ceccotti T., P. Monot P., Reau F., Popescu H., D’Oliveira P., Martin P., Fukuda Y., Boldarev A.S., Gasilov S.V., Gasilov V.A.

Autors Affiliation: Russian Acad Sci, Joint Inst High Temp, Moscow 127412, Russia; RAS, AM Prokhorov Inst Gen Phys, Moscow 117901, Russia; IPCF, Intense Laser Irradiat Lab, Consiglio Nazl Ric, Area Ric, Pisa, Italy; Univ Pisa, Dipartimento Fis, Pisa, Italy; Univ Pisa, Ist Nazl Fis Nucl, Sez Pis, I-56100 Pisa, Italy; Univ Paris, CEA, CNRS, Ecole Polytech,Lab Utilisat Lasers Intenses, F-75252 Paris, France; CEN Saclay, DSM IRAMIS, CEA, Serv Photons, Gif Sur Yvette, France; Japan Atom Energy Agcy, Kansai Photon Sci Inst, Tyoto, Japan; RAS, Inst Math Modeling, Moscow 117901, Russia

Abstract: We used X-ray spectroscopy as a diagnostic tool for investigating the properties of laser-cluster interactions at the stage in which non-adiabatic cluster expansion takes place and a quasi-homogeneous plasma is produced. The experiment was carried out with a 10 TW, 65 fs Ti:Sa laser focused on CO2 cluster jets. The effect of different laser-pulse contrast ratios and cluster concentrations was investigated. The X-ray emission associated to the Rydberg transitions allowed us to retrieve, through the density and temperature of the emitting plasma, the time after the beginning of the interaction at which the emission occurred. The comparison of this value with the estimated time for the “homogeneous” plasma formation shows that the degree of adiabaticity depends on both the cluster concentration and the pulse contrast. Interferometric measurements support the X-ray data concerning the plasma electron density.


Volume: 26 (1)      Pages from: 69  to: 81

KeyWords: femtosecond laser interaction with clust; Interferometer of plasma; plasma diagnostics; X-ray spectroscopy of multi-charged ions;
DOI: 10.1017/S0263034608000104

Citations: 16
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