PowerPoint Modeling propagation of femtosecond laser pulses in ionized gas media
Valer TOSA
National Intitute for R&D of Isotopic and Molecular Technology,
Cluj-Napoca, ROMANIA
High order harmonics generation (HHG)
High-order harmonics
Modeling laser field propagation:
3. Advance solution by a Cranck-Nicolson scheme
4. Inverse Fourier transform
V. Tosa, et al, Phys. Rev. A 67, (2003) 063817
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Model capabilities
includes different focusing configurations
may account for frequency chirp of the pulse
CEP can be an input parameter
additional time-frequency analysis (post-processing)
including double (multiple) ionization to account for high intensity cases
ELI-NP: The Way Ahead, Bucharest, 10-12 March 2011
Example results (1)
Example results (2)
Example results (3)
Propagation effect in time domain
V. Tosa et al.
Propagation effect in frequency domain
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Coherent superposition of harmonic fields (1)
Formation of
far field
864.bin
ELI-NP: The Way Ahead, Bucharest, 10-12 March 2011
(a) Harmonic near fields contributing to the attosecond pulse at t=−2T0 and different r distances from the axis.
(b) The normalized envelopes of the corresponding field intensities.
Coherent superposition of harmonic fields (2)
V. Tosa et al, PRA 79, 043828 (2009)
ELI-NP: The Way Ahead, Bucharest, 10-12 March 2011
Conclusions:
can be characterized by a numerical model
Two or more pulses can be described in simultaneous propagation
Measured quantities can be used as input
Methods to describe coherent field superposition are available
The above instruments could be used to model the process of
coherent beam combining in ELI-NP Project (?)
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4. Inverse Fourier transform