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Two-color high-harmonic generation from relativistic plasma mirrors.

N F Beier¹, F Dollar¹

¹STROBE, NSF Science & Technology Center, University of California, Irvine, California 92617, USA.

Physical Review. E

|August 16, 2023

Summary

This study explores two-beam laser interactions for attosecond light generation. Optimal harmonic generation occurs with equal intensity, circularly polarized laser fields, revealing robust selection rules.

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Area of Science:

Plasma Physics
Quantum Optics
Laser-Plasma Interactions

Background:

High-intensity laser-matter interactions generate attosecond pulses via high-harmonic generation (HHG).
Most research has focused on single laser beam configurations for HHG.
Understanding multi-beam interactions is crucial for advancing HHG efficiency and control.

Purpose of the Study:

To numerically investigate the influence of wavelength and polarization on relativistic HHG.
To analyze two-beam interactions at normal incidence on plasma mirrors.
To identify key parameters governing the efficiency and characteristics of two-beam HHG.

Main Methods:

Numerical simulations of relativistic laser-plasma interactions.
Modeling of two-beam configurations with varying wavelengths and polarizations.

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Analysis of harmonic spectra and emission properties.

Main Results:

The two-beam harmonic generation process is robust and follows specific selection rules.
The emitted harmonic intensity is optimized under conditions of equal intensity for two-color circularly polarized fields.
Wavelength and polarization play critical roles in shaping the HHG process.

Conclusions:

Two-beam interactions offer a viable pathway for controlled attosecond light generation.
The identified selection rules provide a framework for optimizing HHG experiments.
Equal intensity circularly polarized beams are key for maximizing harmonic emission in this configuration.