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Proceedings Paper

Interaction between subpicosecond laser and fused silica
Author(s): Hongbing Jiang; Zhaoxin Wu; Quan Sun; Yi Liu; Qihuang Gong
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Paper Abstract

We studied the interaction between sub-picosecond laser pulse with fused silica. Breakdown threshold, electron collision time and nonlinear propagation dynamics were investigated to study the ionization dynamics and nonlinear propagation process of laser pulse. Electron collision time was measured to be about 1.7fs when the electron density is about 1019cm-3. Measurements on single shot laser-induced breakdown threshold in bulk fused silica were performed for pulse duration tp ranging from 240fs to 2.5ps when objective with different numerical aperture (NA) were used. It was found that the threshold tendency was depend on effective NA. Numerical simulations based on the nonlinear propagation model revealed that the defocusing effect of the bulk plasma was responsible for the different tendencies. Multi-foci was found at high incident pulse energy and the numerical simulations revealed that it was concomitant with pulse reshaping and refocusing by self-focus.

Paper Details

Date Published: 28 January 2005
PDF: 9 pages
Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.572658
Show Author Affiliations
Hongbing Jiang, Peking Univ. (China)
Zhaoxin Wu, Peking Univ. (China)
Quan Sun, Peking Univ. (China)
Yi Liu, Peking Univ. (China)
Qihuang Gong, Peking Univ. (China)

Published in SPIE Proceedings Vol. 5646:
Nonlinear Optical Phenomena and Applications
Qihuang Gong; Yiping Cui; Roger A. Lessard, Editor(s)

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