Stimulated Brillouin backscattering (B-SBS) from delayed interaction with a preformed, long scale-length expanding plasma was experimentally investigated in a regime favorable to strong self-focusing (SF) and filamentation. An extremely low backscattering reflectivity (of the order of 10-4) was measured and anomalous time-resolved spectra were observed. Spectral and temporal features of the reflectivity suggest a strong effect of SF on B-SBS: In the early phase of the interaction SF lowers the B-SBS threshold and possibly leads to rapid saturation, while in the late phase there is a substantial decoupling of the SBS active regions from the plasma bulk due to their motion towards the laser beam. This motion is attributed to a moving focus effect driven by ponderomotive SF.
Scheda prodotto non validato
Scheda prodotto in fase di analisi da parte dello staff di validazione
|Titolo:||Stimulated Brillouin backscattering from underdense expanding plasmas in a regime of strong filamentation|
|Citazione:||A., G., A., M., E., S., Biancalana, V., C., D., D., G., et al. (1999). Stimulated Brillouin backscattering from underdense expanding plasmas in a regime of strong filamentation. PHYSICAL REVIEW E, 59, 1038-1046.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
File in questo prodotto: