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Macroscopic effects in noncollinear high-order harmonic generation.

C M Heyl1, P Rudawski1, F Brizuela1

  • 1Department of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden.

Physical Review Letters
|April 29, 2014
PubMed
Summary

This study explores two-color high-order harmonic generation using crossed laser fields. The noncollinear scheme allows measurement and control of phase matching, analogous to attosecond pulse generation.

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Area of Science:

  • Nonlinear optics
  • Quantum optics
  • Laser physics

Background:

  • High-order harmonic generation (HHG) is a key process for creating extreme ultraviolet and X-ray radiation.
  • Controlling macroscopic phase matching is crucial for optimizing HHG efficiency and beam properties.
  • Noncollinear laser configurations offer unique possibilities for manipulating light-matter interactions.

Purpose of the Study:

  • To investigate two-color high-order harmonic generation using a noncollinear driving field and its second harmonic.
  • To demonstrate the measurement and control of macroscopic phase matching effects.
  • To establish an analogy between spatial phase effects in HHG and temporal carrier-envelope effects in attosecond pulse generation.

Main Methods:

  • Utilizing sum- and difference-frequency generation processes in the nonlinear medium.
  • Employing a noncollinear geometry with a small crossing angle between the driving fields.
  • Analyzing the spatial phase distribution in the generation volume and its far-field projection.

Main Results:

  • A geometrical phase mismatch component, dependent on the noncollinear angle, was identified.
  • The noncollinear scheme enables precise control over macroscopic phase matching.
  • Spatial phase effects were shown to map directly to the far field, mirroring temporal effects.

Conclusions:

  • The noncollinear two-color HHG scheme provides a powerful tool for controlling phase matching.
  • This method offers a direct analogy to temporal effects in attosecond pulse generation.
  • The findings advance the understanding and control of light generation in nonlinear optics.