Transition to filamentary regime in laser-plasma interaction evidenced by 2ω emisssion

Year: 1993

Authors: Biancalana V., Borghesi M., Chessa P., Deha I., Giulietti A., Giulietti D., Gizzi LA., Willi O.

Autors Affiliation: CNR, Ist Fis Atom & Molec, via Giardino 7, I-56127 Pisa, Italy;
Univ Pisa, Dipartimento Fis, Piazza Torricelli 2, Pisa, Italy;
Univ Sci & Technol H Boumedienne, Algiers, Algeria
Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England

Abstract: The level of second-harmonic light emitted from a laser-exploded foil plasma at nominal irradiance up to 3.10(13) W/cm2 was found to be extremely sensitive to both target position and irradiance on target. Either a small target displacement or a small increase in irradiance resulted in a jump of the 2omega level of more than three orders of magnitude. Correspondingly, a transition was observed from a 2omega source pattern clearly signed by the original laser spot pattern to unstable patterns of filaments whose size is consistent with the maximum growth of the instability.

Journal/Review: EPL

Volume: 22 (3)      Pages from: 175  to: 180

KeyWords: nonlinear waves and nonlinear interactio; electromagnetic wave; propagation in plasma; 2nd-harmonic emission;
DOI: 10.1209/0295-5075/22/3/003

Citations: 10
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