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Modeling propagation of femtosecond laser pulses in ionized gas media

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. X-ray CCD. Intense fs laser. X-ray filter. electron. Soft X-ray spectrometer. Gas jet. Laser.

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Modeling propagation of femtosecond laser pulses in ionized gas media

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  1. 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

  2. High-order harmonics X-ray CCD Intense fs laser X-ray filter electron Soft X-ray spectrometer Gas jet Laser atom X-ray Signal process H95 H85 H75 H65 100 110 130 85 90 95 105 115 120 125 80 High-order harmonics (Å) High order harmonics generation (HHG)

  3. Modeling laser field propagation:

  4. Model capabilities • uses experimentally measured parameters (focusing conditions, pulse energy, duration) • includes different focusing configurations (gaussian, supergaussian, truncated gaussian, bessel-gauss) • may account for frequency chirp of the pulse • CEP can be an input parameter • additional time-frequency analysis (post-processing) • Recent developments • simultaneous propagation of two (three) fields • including double (multiple) ionization to account for high intensity cases

  5. Example results (1)

  6. Example results (2)

  7. Example results (3)

  8. Propagation effect in time domain V. Tosa et al. PRA 71, 063807 PRA 71, 063808

  9. Propagation effect in frequency domain

  10. Coherent superposition of harmonic fields (1) Formation of far field from constructive interference of near fields V. Tosa et al, PRA 79, 043828 (2009)

  11. Coherent superposition of harmonic fields (2) V. Tosa et al, PRA 79, 043828 (2009) (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.

  12. Conclusions: • Propagation of laser pulses in gaseous ionizing media • 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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