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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Improving high-order harmonic yield using wavefront-controlled ultrashort laser pulses.

Stefan Eyring1, Christian Kern, Michael Zürch

  • 1Institut für Optik und Quantenelektronik, Physikalisch-Astronomische Fakultät ,Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany.

Optics Express
|March 16, 2012
PubMed
Summary
This summary is machine-generated.

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Wavefront-shaped laser beams significantly boost high-order harmonic generation. Optimized asymmetric beams with larger diameters increase yield, even at lower peak intensities, highlighting the importance of laser wavefront control.

Area of Science:

  • Quantum optics
  • Laser physics
  • Nonlinear optics

Background:

  • High-order harmonic generation (HHG) is a crucial process for producing extreme ultraviolet and X-ray radiation.
  • Optimizing HHG yield is essential for various applications, including spectroscopy and microscopy.
  • The influence of laser beam properties on HHG efficiency is an active area of research.

Purpose of the Study:

  • To investigate the effect of wavefront shaping on high-order harmonic yield.
  • To understand the relationship between laser beam profile and harmonic generation efficiency.
  • To determine if optimized laser wavefronts can enhance high-order harmonic radiation.

Main Methods:

  • Utilizing wavefront-shaped laser beams for high-order harmonic generation.

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  • Analyzing the laser beam profile in the vicinity of the interaction region.
  • Comparing the harmonic yield from optimized and unoptimized laser beams.

    • Main Results:

    • Wavefront shaping of laser beams leads to an increase in high-order harmonic yield.
    • The optimized laser beam profile is characterized by asymmetry and a larger diameter.
    • Higher harmonic yield is achieved with the optimized beam, despite a lower peak intensity compared to an unoptimized beam.

    Conclusions:

    • Laser wavefront control is a critical factor for efficient high-order harmonic generation.
    • Asymmetric and larger diameter focal profiles can enhance harmonic yield.
    • The focal profile, influenced by the fundamental laser beam's wavefront, plays a significant role in HHG efficiency.