Beschreibung:
<jats:p>We experimentally demonstrate a simultaneous spatial extension and temporal prolongation of plasma wire generated by a high-power femtosecond laser undergoing filamentation. A single femtosecond laser pulse, transmitted through a specially designed telescopic lens array, creates three concatenated segments of the plasma wire with total length of over 3 meters and free electron density of ∼10<jats:sup>16</jats:sup> cm<jats:sup>−3</jats:sup> along the entire distance. The plasma filaments were irradiated by a secondary nanosecond laser that propagates collinear to the plasma wire. The plasma wire absorbs energy from the secondary laser and its lifetime is prolonged from about 3 ns to above 30 ns. The obtained plasma wire length and lifetime prolongation is limited only by the fs/ns lasers parameters.</jats:p>