Abstract
With ultrashort light pulses at high intensity, a sharp increase of second harmonic generation is observed in various media presenting direct evidence for a large carrier concentration produced by dialectric breakdown. In water, signals up to 108 photons at the second harmonic frequency are measured and compared with model calculations, which suggest an electron density of ∼ 1020 cm-3. Breakdown is found to occur at power levels notably higher than inferred from the ocular observation of broad band luminescence.
Original language | English |
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Pages (from-to) | 287-292 |
Number of pages | 6 |
Journal | Optics Communications |
Volume | 34 |
Issue number | 2 |
DOIs | |
State | Published - 1980 |
Externally published | Yes |