摘要
Propagation of femtosecond light pulses in water is investigated. By changing input power from slightly above to highly above threshold for self-focusing, it is shown that either group velocity dispersion （GVD） or multi-photon ionization （MPI） and multi-photon absorption （MPA） may arrest the collapse. When MPI and MPA dominate the propagation, the pulse can be self-compressed to a few optical cycles. In spectral domain, MPI alone induces a strong blue shift. MPA can restrain this strong blue shift.
Propagation of femtosecond light pulses in water is investigated. By changing input power from slightly above to highly above threshold for self-focusing, it is shown that either group velocity dispersion （GVD） or multi-photon ionization （MPI） and multi-photon absorption （MPA） may arrest the collapse. When MPI and MPA dominate the propagation, the pulse can be self-compressed to a few optical cycles. In spectral domain, MPI alone induces a strong blue shift. MPA can restrain this strong blue shift.
基金
This work was supported by the Chinese National Major Basic Research Development Program(973 Program),and the National Natural Science Foundation of China(No.10674145).
