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Generation of laser-driven higher harmonics from grating targets.

M Cerchez1, A L Giesecke, C Peth

  • 1Institut für Laser and Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany. mirela.cerchez@uni-duesseldorf.de

Physical Review Letters
|February 26, 2013
PubMed
Summary

Researchers generated high-order harmonic radiation using modulated targets and intense laser pulses. They demonstrated control over harmonic spectrum composition and emission angles via laser parameters.

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Area of Science:

  • Physics
  • Laser-Matter Interaction
  • Nonlinear Optics

Background:

  • High-order harmonic generation (HHG) is a key phenomenon in nonlinear optics.
  • Previous studies primarily focused on atomic or planar solid targets.
  • The use of structured targets for HHG remains less explored.

Purpose of the Study:

  • To present the first experimental evidence of higher-order harmonic radiation from periodically modulated targets (gratings).
  • To investigate the influence of laser parameters on harmonic emission characteristics.
  • To demonstrate control over the harmonic spectrum and emission angles.

Main Methods:

  • Irradiation of grating targets with relativistic, ultrashort laser pulses (<30 fs).
  • Experimental setup utilizing high intensity laser pulses [Iλ(2)=10(20) (W/cm(2)) μm(2)].

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  • Numerical simulations to analyze laser-target interaction and harmonic emission.

    • Main Results:

    • Experimental observation of higher-order harmonic radiation up to the 45th order.
    • Interference effects on the grating surface leading to harmonic emission along the target surface.
    • Demonstrated control over harmonic spectrum composition by adjusting laser focusing and wavefront curvature.
    • Influence of laser parameters on the emission angle of specific harmonic orders.

    Conclusions:

    • Periodically modulated targets are effective for generating high-order harmonic radiation.
    • Laser pulse parameters significantly influence the spectral composition and spatial distribution of emitted harmonics.
    • This work opens new avenues for controlling and tailoring high harmonic generation for advanced applications.