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Spectral modulation of high-order harmonics in relativistic laser-solid interaction
B Y Li1,2, F Liu1,2, M Chen1,2
1Key Laboratory for Laser Plasmas (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Physical Review. E
|March 16, 2024
Summary
Investigating high-order harmonic generation in laser-plasma interactions reveals spectral modulation. Tailoring the plasma profile offers a new method for producing isolated attosecond pulses.
Area of Science:
- Laser-Plasma Physics
- Attosecond Science
- Quantum Optics
Background:
- High-order harmonic generation (HHG) is a key process for producing ultrashort pulses.
- Understanding spectral modulation is crucial for controlling HHG output.
Purpose of the Study:
- To investigate the spectral modulation of high-order harmonics in relativistic laser-solid interactions.
- To establish the link between spectral modulation and attosecond pulse generation.
- To propose a method for generating isolated attosecond pulses.
Main Methods:
- Numerical simulations of relativistic laser-solid interactions.
- Analysis of spectral envelope modulation and harmonic splitting.
- Theoretical explanation of spectral modulation and temporal pulse modification.
Main Results:
- Spectral modulation is dependent on the surface plasma density profile.
- Observed spectral envelope modulation and regular/irregular harmonic splitting.
- Established connections between spectral modulation and attosecond pulse train modification.
Conclusions:
- Tailoring the surface plasma profile can control spectral modulation.
- This control enables a potential method for producing isolated attosecond pulses.
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