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Updated: Sep 23, 2025
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
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Phase-matched high-order harmonic generation in pre-ionized noble gases
O Finke1,2, J Vábek1,2,3, M Nevrkla1,2
1ELI Beamlines Centre, FZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21, Prague, Czechia.
Scientific Reports
|May 13, 2022
Summary
Researchers improved high-harmonic generation efficiency by pre-ionizing gas targets with capillary discharge. This method overcomes plasma defocusing, enhancing XUV generation for advanced applications.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Plasma Physics
- Quantum Optics
Background:
- Efficient high-order harmonic generation (HHG) is crucial for short-wavelength light sources.
- Phase-matching limitations in neutral gas targets hinder HHG efficiency.
- Plasma defocusing caused by laser ionization impedes achieving phase-matching.
Purpose of the Study:
- To propose and demonstrate a novel method for improving phase-matching in HHG.
- To enhance the efficiency of extreme ultraviolet (XUV) generation.
- To enable photon-hungry applications requiring compact short-wavelength sources.
Main Methods:
- Pre-ionizing neutral gas targets using a weak capillary discharge before laser interaction.
- Utilizing an 800 nm femtosecond laser for HHG in argon and krypton.
- Employing analytical modeling and numerical simulations to analyze phase-mismatch control.
Main Results:
- Successfully demonstrated improved phase-matching in absorption-limited XUV generation.
- Significantly increased the efficiency of harmonic generation.
- Confirmed the ability to control phase-mismatch through the proposed pre-ionization technique.
Conclusions:
- Pre-ionizing gas targets with capillary discharge is an effective method to overcome phase-matching limitations in HHG.
- This technique enhances XUV generation efficiency, making it suitable for advanced applications.
- The study paves the way for developing more efficient compact short-wavelength light sources.
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