Abstract
The triggering and guiding of negative discharges using filaments induced by a femtosecond-terawatt laser pulse have been studied in sphere-plane gaps up to 4.5 meters. Fast-frame camera pictures allow the evaluation of the influence of the negative leader propagation on the triggering and guiding process. We show that the plasma channel can either trigger a space-leader discharge or act as a guiding path for the negative leader head. For the latter case the results suggest a linear dependence of the guided lengths up to 2.4 m, while the formation of a space-leader reduces this guided length by up to 50%. This effect is explained by the limited plasma lifetime of the filament that is measured to be about 1 μs.
| Original language | English |
|---|---|
| Pages (from-to) | 561-566 |
| Number of pages | 6 |
| Journal | Applied Physics B: Lasers and Optics |
| Volume | 82 |
| Issue number | 4 |
| DOIs | |
| State | Published - Mar 2006 |
| Externally published | Yes |