NDLI: Possibility of generating a sequence of attosecond subpulses upon second harmonic generation of high-intensity femtosecond pulses in an optically extended medium

Content Provider	Springer Nature Link
Author	Lysak, T. M. Trofimov, V. A.
Copyright Year	2009
Abstract	Based on numerical simulation, we demonstrate the possibility of forming a sequence of equalintensity coupled subpulses upon second harmonic generation (SHG) of a high-intensity femtosecond pulse in an optically extended medium whose length is much smaller than the diffraction length of the incident optical radiation. The duration of individual subpulses can be ten (or more) times shorter than the duration of the initial femtosecond pulse. With respect to the spatial coordinate, the breakup of the initial Gaussian or hyper-Gaussian beam into a regular structure of subbeams, whose size can be from two to ten times smaller than the initial beam radius, also takes place. The SHG is shown to result in a limitation of the intensity of axially symmetric beams in a nonlinear focus. The subpulses being formed can propagate with velocities that differ substantially from the velocities of their propagation in the linear medium. The shape of the subpulses is close to a soliton shape, whereas the spatial distribution of the beam has a profile that can be approximated by a set of Gaussian and hyper-Gaussian distributions. The radiation at the double frequency leads to a phase modulation of the optical radiation at the fundamental frequency, which is necessary for the formation of subpulses and subbeams and is the cause of formation of these structures. The formation of subpulses occurs at the fundamental frequency at a small efficiency (≤8%) of energy conversion into the second harmonic.
Starting Page	937
Ending Page	949
Page Count	13
File Format	PDF
ISSN	0030400X
Journal	Optics and Spectroscopy
Volume Number	106
Issue Number	6
e-ISSN	15626911
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-06-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Frequency conversion; harmonic generation, including higher-order harmonic generation Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics Optical Spectroscopy, Ultrafast Optics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials

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