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High harmonic generation spectroscopy via orbital angular momentum.

Jan Troß1, Carlos A Trallero-Herrero2

  • 1James R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.

The Journal of Chemical Physics
|September 1, 2019
PubMed
Summary
This summary is machine-generated.

We developed a new laser technique using orbital angular momentum (OAM) to study high harmonic generation (HHG). This method allows precise measurement of multiorbital HHG emission in molecular nitrogen.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics
  • Spectroscopy

Background:

  • High harmonic generation (HHG) is a crucial process for producing coherent extreme ultraviolet and X-ray radiation.
  • Understanding the phase and amplitude of HHG is essential for various applications, including attosecond science and high-resolution spectroscopy.
  • Orbital angular momentum (OAM) of light offers new degrees of freedom for controlling light-matter interactions.

Purpose of the Study:

  • To introduce a novel interferometric spectroscopic method for in situ measurement of high harmonic generation.
  • To utilize the orbital angular momentum (OAM) of laser fields to precisely control and probe HHG.
  • To measure the angle-dependent phase and amplitude of multiorbital HHG emission in molecular nitrogen.

Main Methods:

  • Employing a fundamental laser field with orbital angular momentum (OAM).
  • Mixing laser beams with different OAM to create two tightly spaced laser foci.
  • Utilizing the interference of harmonics generated in the far field for spectroscopic analysis.

Main Results:

  • Demonstration of an OAM-based in situ HHG interferometric spectroscopic technique.
  • Successful measurement of the phase and amplitude of angle-dependent multiorbital HHG emission.
  • Characterization of HHG in molecular nitrogen using structured light.

Conclusions:

  • The presented OAM-based interferometric method provides a powerful tool for characterizing complex HHG processes.
  • This technique enables detailed investigation of multiorbital HHG emission, crucial for understanding light-matter interactions.
  • The findings pave the way for advanced spectroscopic studies and applications in ultrafast science.