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Continuous relativistic high-harmonic generation from a kHz liquid-sheet plasma mirror.
Optics Letters
|December 24, 2024
Summary
We achieved continuous high-harmonic generation using liquid-sheet targets, producing stable extreme ultraviolet light. This breakthrough paves the way for future high-power attosecond lasers.
Area of Science:
- Laser Physics
- Plasma Physics
- Attosecond Science
Background:
- High-harmonic generation (HHG) is a key process for producing ultrashort light pulses.
- Previous methods often struggled with stability and reproducibility at high repetition rates.
- Liquid targets offer unique advantages for plasma generation and control.
Purpose of the Study:
- To demonstrate continuous high-harmonic generation at a 1 kHz repetition rate.
- To investigate the use of liquid-sheet plasma mirrors for attosecond pulse generation.
- To explore precise control over plasma density gradients and driving laser waveforms.
Main Methods:
- Utilizing relativistic-intensity near-single-cycle light transients to drive a liquid-sheet plasma mirror.
- Implementing precise control over the plasma surface density gradient.
- Precisely shaping the driving light waveform.
Main Results:
- Achieved continuous high-harmonic generation at a 1 kHz repetition rate.
- Produced highly stable and reproducible extreme ultraviolet spectral quasi-continua.
- Demonstrated the potential for generating stable kHz-trains of isolated attosecond pulses.
Conclusions:
- Liquid-sheet targets are a promising platform for high-power attosecond laser development.
- Precise control over plasma and laser parameters is crucial for stable HHG.
- This work represents a significant step towards practical attosecond light sources.
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