Laser-induced breakdown by impact ionization in Si02 with pulse widths
نویسندگان
چکیده
Results of laser-induced breakdown experiments in fused silica (SiOJ employing 150 fs-7 ns, 780 mn laser pulses are reported. The avalanche ionization mechanism is found to dominate over the entire pulse-width range. Fluence breakdown threshold does not follow the scaling of F,6, when pulses are shorter than 10 ps. The impact ionization coefficient of SiO, is measured up to -3 X 10’ V/cm. The relative role of photoionization in breakdown for ultrashort pulses is discussed.
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