Filamentation and second-harmonic emission in laser-plasma interactions
- 25 December 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 63 (26) , 2812-2815
- https://doi.org/10.1103/physrevlett.63.2812
Abstract
Interferograms of an underdense, preformed plasma which is irradiated with a line-focused laser beam show pronounced density perturbations. The interferograms are compared to simultaneous, gated images of second-harmonic emission. We observe a correlation between the spatial positions of the density perturbations and the peak of the second-harmonic emission. We interpret these phenomena as being emission from a local, nonlinear focus in the underdense plasma, rather than from the entire length of a filament.Keywords
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