Chinese Optics Letters, Vol. 5, Issue 8, 490 (2007)
Pulse compression and supercontinuum at different powers of femtosecond pulses in water
Feng Xu1,2,*, Jiansheng Liu1,2, Ruxin Li1, and Zhizhan Xu1
- 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
- 2Graduate School of the Chinese Academy of Sciences, Beijing 100039
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.