Plasma density determination by transmission of laser-generated surface harmonics
- Gibbon, P.
- Altenbernd, D.
- Teubner, U.
- Förster, E.
- Audebert, Patrick
- Geindre, Jean-Paul
- Gauthier, Jean-Claude
- Mysyrowicz, André
DOIAbstract
International audienceA diagnostic is proposed for determining the density of laser-generated plasmas. The scheme exploits surface harmonics generated by short, intense laser pulses reflected from an overdense plasma layer. At sufficiently high intensities (Iλ2>1018 W cm-2), the reflected spectrum contains harmonics well above the plasma frequency, corresponding to the maximum plasma density. The transmitted spectrum, on the other hand, exhibits a low-frequency cutoff for ω<ωp, offering a simple means of deducing the plasma density
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