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Reply to 'The super-quadratic growth of high-harmonic signal as a function of pressure'

Nature Physics volume 6, pages 928–929 (2010)Cite this article

Seres et al. reply

The high-harmonic generation (HHG) yield depends on several important experimental parameters and can be described with models including single atom response and propagation effects. In our recent paper1 we extended this description by adding a stimulated emission process and named it self-seeded X-ray parametric amplification (XPA). Some characteristics of XPA are similar to that of pure HHG, as Kazamias et al. state. However, other observed characteristics (such as exponential growth, gain narrowing and strong blueshift) and their dependence on intensity and pressure1 cannot be explained by HHG, whereas they are in excellent agreement with our XPA model.

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Figure 1: Measured XUV signal from argon as a function of jet position xj (normalized to the Rayleigh length xR) and pressure.
Figure 2: Measured XUV signal at the 39th harmonic (diamonds, 2 × 1014 W cm−2) as a function of the pressure in comparison with different theoretical models:

References

  1. Seres, J. et al. Nature Phys. 6, 455 (2010).

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  2. Kazamias, S. et al. Phys. Rev. Lett. 90, 193901 (2003).

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  3. He, X. et al. Phys. Rev. A 79, 063829 (2009).

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Authors and Affiliations

  1. Institute of Optics and Quantum Electronics Friedrich-Schiller-University Jena, Max-Wien-Platz 1, 07743, Jena, Germany

    J. Seres, E. Seres & C. Spielmann

  2. GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291, Darmstadt, Germany

    B. Ecker, D. Hochhaus, D. Zimmer, V. Bagnoud, B. Aurand, B. Zielbauer & T. Kühl

  3. Johannes-Gutenberg-University, Saarstrasse 21, 55099, Mainz, Germany

    B. Ecker, D. Zimmer, B. Aurand, B. Zielbauer & T. Kühl

  4. Helmholtz Institute Jena, Helmholtzweg 4, 07743, Jena, Germany

    B. Ecker, B. Zielbauer & C. Spielmann

  5. EMMI, Extreme Matter Institute, Planckstrasse 1, 64291, Darmstadt, Germany

    D. Hochhaus & B. Aurand

  6. Johann-Wolfgang von Goethe-University, Senckenberganlage 31, 60325, Frankfurt, Germany

    D. Hochhaus

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Correspondence to C. Spielmann.

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Seres, J., Seres, E., Ecker, B. et al. Reply to 'The super-quadratic growth of high-harmonic signal as a function of pressure'. Nature Phys 6, 928–929 (2010). https://doi.org/10.1038/nphys1827

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