Abstract
We experimentally investigate the interaction of a preformed plasma with a high intensity 2-ps Nd:Glass laser pulse entering from the longitudinal direction. Observations of the transverse intensity profile of the longitudinal beam are found to be well reproduced by simple hydrodynamic and ray-tracing calculations, if a nonuniform line-focus is taken into account. Observations of visible emission from the plasma reveal the presence of a bright jetlike structure, which extends over an unusually long length of more than ten millimeters. Various characteristics of this jet are experimentally investigated.
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