DYNAMICS OF IONIZATION-ENHANCED SPECTRAL EXPANSION IN WATER INDUCED BY AN INTENSE FEMTOSECOND LASER BEAM
Wang Shu-feng (王树峰)a, Qin Yuan-dong (秦元东)a, Yang Hong (杨宏)a, Wang Dan-ling (王丹翎)a, Zhu Chang-jun (朱长军)a, Gong Qi-huang (龚旗煌)b
a National Laboratory for Mesoscopic Physics and Department of Physics, Beijing University, Beijing 100871, China; b National Laboratory for Mesoscopic Physics and Department of Physics, Beijing University, Beijing 100871; and Institute of Physics, Chinese Academy of Science, Beijing 100080, China
Abstract The dynamic process of white-continuum generation in water was investigated by the pump－probe technique with a femtosecond intense laser at 805nm. The spectrum width of the probe beam was broadened at the blue side and varied with different delay times. This blueshift was attributed to the ionization-enhanced optical nonlinearity, in which both the multi-photon ionization and avalanche ionization had an effect.
Received: 18 January 2001
Revised: 14 March 2001
Accepted manuscript online:
PACS:
42.65.Re
(Ultrafast processes; optical pulse generation and pulse compression)
(Doped-insulator lasers and other solid state lasers)
Fund: Project supported by the National Key Basic Research Special Foundation (NKBRSF) (Grant No. G1999075607) and the National Natural Science Foundation of China (Grant Nos. 19884001 and 19525412).
Cite this article:
Wang Shu-feng (王树峰), Qin Yuan-dong (秦元东), Yang Hong (杨宏), Wang Dan-ling (王丹翎), Zhu Chang-jun (朱长军), Gong Qi-huang (龚旗煌) DYNAMICS OF IONIZATION-ENHANCED SPECTRAL EXPANSION IN WATER INDUCED BY AN INTENSE FEMTOSECOND LASER BEAM 2001 Chinese Physics 10 735
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