Self-compression of femtosecond pulses in argon with a power close to the self-focusing threshold |
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Authors: | Chen Xiao-Wei Zeng Zhi-Nan Dai Jun Li Xiao-Fang Li Ru-Xin and Xu Zhi-Zhan |
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Institution: | State Key Laboratory of High Field Laser Physics, Shanghai
Institute of Optics and Fine Mechanics,
Chinese Academy of
Sciences, Shanghai
201800, China |
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Abstract: | Self-compression of femtosecond pulses in noble gases with an input
power close to the self-focusing threshold has been investigated
experimentally and theoretically. It is demonstrated that either
multiphoton ionization (MPI) or space--time focusing and
self-steepening effects can induce pulse shortening, but they
predominate at different beam intensities during the propagation.
The latter effects play a key role in the final pulse
self-compression. By choosing an appropriate focusing parameter,
action distance of the space--time focusing and self-steepening
effects can be lengthened, which can promote a shock pulse structure
with a duration as short as two optical cycles. It is also found
that, for our calculation cases in which an input pulse power is
close to the self-focusing threshold, either group velocity
dispersion (GVD) or multiphoton absorption (MPA) has a negligible
influence on pulse characteristics in the propagation process. |
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Keywords: | nonlinear propagation self-focusing self-compression |
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