研究目的
Investigating the enhancement of terahertz (THz) radiation through the interaction of high intensity laser pulses with micron-thickness metal foils, utilizing target ablation to generate underdense preplasma.
研究成果
The introduction of a preplasma through target ablation significantly enhances the THz radiation by increasing the charge and energy of the electron beams generated during the laser-plasma interaction. This results in a nearly tenfold enhancement of THz radiation energy, demonstrating the potential for improved THz sources in applications requiring high power and efficiency.
研究不足
The study is limited by the computational constraints of the PIC simulations, which may not fully capture all physical phenomena in the laser-plasma interactions. Additionally, the experimental validation of the simulation results is not discussed.
1：Experimental Design and Method Selection:
The study employs two-dimensional particle-in-cell (PIC) simulations to model the interaction between high intensity laser pulses and metal foils, with and without the introduction of a preplasma generated by a milli-joule picosecond ablation laser pulse.
2：Sample Selection and Data Sources:
The simulations focus on an aluminum foil target with a
3：5 μm thickness and 7 g/cm3 density. List of Experimental Equipment and Materials:
A hydrodynamic code MULTI is used to calculate the ablated preplasma, and the PIC code EPOCH is utilized for simulating the laser-plasma interactions.
4：Experimental Procedures and Operational Workflow:
The ablation laser pulse induces preplasma at the front surface of the target, followed by the main laser pulse interaction. The THz radiation is calculated based on the electron beams generated during these interactions.
5：Data Analysis Methods:
The energy and angular-spectral distribution of THz radiation are analyzed using fast Fourier transform (FFT) and compared between conditions with and without target ablation.
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