Abstract
In this paper we analyze the basic characteristics of experimentally observed second-harmonic light spectra generated during long-duration high-intensity laser-plasma interactions. It is shown that the observed spectrum characteristics of threshold, red-shift, and target material dependence can be explained by a two-step mechanism of parametric coupling affected by a strong "imposed" ponderomotive force. The imposed ponderomotive force, generated by the laser light's standing-wave pattern, affects the parametric coupling through increased linear wave dispersion. Experimental results agree with the theoretical prediction and suggest the existence of additional parametric instabilities in the ponderomotive-force-dominated regime.
| Original language | English |
|---|---|
| Pages (from-to) | 1601-1608 |
| Number of pages | 8 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 24 |
| Issue number | 3 |
| DOIs | |
| State | Published - 1981 |
| Externally published | Yes |
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