研究目的
To study the impact of the target thickness on the efficiency of laser-plasma based high-order harmonics generation (HHG) and to identify the optimal parametric region for efficient HHG.
研究成果
The study concludes that the optimal target thickness region for efficient HHG is [λ/2πS, λ/πS], where S is the similarity parameter. In this region, the laser can partially penetrate the target, leading to efficient acceleration and HHG. Both 1D and 2D PIC simulations confirm the theory, demonstrating significantly improved HHG efficiency and the generation of a single attosecond pulse.
研究不足
The study is limited by the current technology's ability to achieve the parametric region for efficient HHG, especially for a plastic target with density around 200nc, requiring a laser pulse with intensity over 8.6 × 1022 W cm?2.
1：Experimental Design and Method Selection:
The study employs analytical and numerical methods, including one-dimensional and two-dimensional particle-in-cell (PIC) simulations, to investigate the effect of target thickness on HHG efficiency.
2：Sample Selection and Data Sources:
The target is a laser-driven overdense plasma with varying thicknesses from
3：03λ to 5λ. List of Experimental Equipment and Materials:
The EPOCH code is used for PIC simulations.
4：Experimental Procedures and Operational Workflow:
The laser propagates along the x-axis with a wavelength λ = 800 nm, and its carrier envelope phase (CEP) is fixed at
5：The target is placed at 12λ with initial electron density of 80nc. Data Analysis Methods:
The conversion efficiency and amplitudes of attosecond pulses are calculated through filtering radiation with frequency lower than 15ω0.
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