Scientific Results

Self-phase modulation in various regimes of intense laser-plasma interactions

Year: 2015

Authors: Giulietti A., Giulietti D.

Autors Affiliation: Istituto Nazionale di Ottica, CNR, Sezione

Abstract: Creation of plasmas by intense laser pulses and consequent laser-plasma interactions involve highly non-linear processes. In particular, a variation of the refractive index induced by the laser action turns into a self-phase modulation (SPM) of the laser field. This effect, already observed with nanosecond laser pulses, achieves striking evidence with ultra-short pulses whose intensity can produce index changes in a time as short as a single optical cycle. In this condition, spectral modifications of the laser pulse produced by SPM may strongly modify the laser-plasma interaction. At the same time, the spectral analysis of the transmitted and scattered laser radiation gives valuable information on a variety of processes occurring in the plasma. In this paper we simply consider a few results, which can be attributed to SPM, with the aim of comparing nanosecond and sub-picosecond laser interaction regimes at moderate laser intensities.


Volume: 81 (6)      Pages from: 1  to: 15

More Information: The authors acknowledge their colleagues\’ contributions from ILIL-INO@CNR Campus, Pisa, Italy, SLIC@CEA, Saclay, France, LOA/Ensta@Ecole Polytechnique, Palaiseau, France, Central Laser Facility@RAL, Didcot, UK and from the INFN Strategic Project PLASMONX@LNF, Frascati, Italy. They also acknowledge financial support from the CNR-funded Italian Research Network ELI-Italy and from the INFN-funded (CN5) project \’Gamma-ray emitter from self-injected Thomson scattering\’ (g-RESIST). The work at ILIL was carried out in the framework of the CNR High Field Photonics Unit (MD.P03.034).
DOI: 10.1017/S0022377815001385

Citations: 4
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