Interplay between absorption, dispersion and refraction in high-order harmonic generation

Dachraoui H, Auguste T, Helmstedt A, Bartz P, Michelswirth M, Müller N, Pfeiffer W, Salieres P, Heinzmann U (2009)
Journal of Physics. B, Atomic, Molecular and Optical Physics 42(17): 175402.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
We report a detailed experimental and theoretical study on high-order harmonic generation of a femtosecond Ti-sapphire laser focused at an intensity of around 10(15) W cm(-2) onto a high-pressure (50-210 mbar) neon gas cell of variable length (1-3 mm). Using thorough three-dimensional simulations, we discuss the interplay between the different factors influencing the harmonic-generation efficiency, i.e. phase matching determined by the electronic and atomic dispersions, re-absorption of the harmonics by the medium and refraction of the generating laser beam. Generically, we find that, in our generation conditions, the emission yield of harmonics from the plateau region of the spectrum is absorption limited, whereas the emission from harmonics in the cut-off is strongly reduced due to both electron dispersion and ionization-induced refraction of the laser beam. A good agreement between the numerical results and the experimental data is obtained for the harmonic yield dependence on the various generation parameters (gas pressure, medium length and laser intensity).
Erscheinungsjahr
Zeitschriftentitel
Journal of Physics. B, Atomic, Molecular and Optical Physics
Band
42
Zeitschriftennummer
17
Artikelnummer
175402
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eISSN
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Dachraoui H, Auguste T, Helmstedt A, et al. Interplay between absorption, dispersion and refraction in high-order harmonic generation. Journal of Physics. B, Atomic, Molecular and Optical Physics. 2009;42(17): 175402.
Dachraoui, H., Auguste, T., Helmstedt, A., Bartz, P., Michelswirth, M., Müller, N., Pfeiffer, W., et al. (2009). Interplay between absorption, dispersion and refraction in high-order harmonic generation. Journal of Physics. B, Atomic, Molecular and Optical Physics, 42(17), 175402. doi:10.1088/0953-4075/42/17/175402
Dachraoui, H., Auguste, T., Helmstedt, A., Bartz, P., Michelswirth, M., Müller, N., Pfeiffer, W., Salieres, P., and Heinzmann, U. (2009). Interplay between absorption, dispersion and refraction in high-order harmonic generation. Journal of Physics. B, Atomic, Molecular and Optical Physics 42:175402.
Dachraoui, H., et al., 2009. Interplay between absorption, dispersion and refraction in high-order harmonic generation. Journal of Physics. B, Atomic, Molecular and Optical Physics, 42(17): 175402.
H. Dachraoui, et al., “Interplay between absorption, dispersion and refraction in high-order harmonic generation”, Journal of Physics. B, Atomic, Molecular and Optical Physics, vol. 42, 2009, : 175402.
Dachraoui, H., Auguste, T., Helmstedt, A., Bartz, P., Michelswirth, M., Müller, N., Pfeiffer, W., Salieres, P., Heinzmann, U.: Interplay between absorption, dispersion and refraction in high-order harmonic generation. Journal of Physics. B, Atomic, Molecular and Optical Physics. 42, : 175402 (2009).
Dachraoui, Hatem, Auguste, T., Helmstedt, Andreas, Bartz, Peter, Michelswirth, Martin, Müller, Norbert, Pfeiffer, Walter, Salieres, P., and Heinzmann, Ulrich. “Interplay between absorption, dispersion and refraction in high-order harmonic generation”. Journal of Physics. B, Atomic, Molecular and Optical Physics 42.17 (2009): 175402.