研究目的
To propose a scheme for generating terahertz (THz) radiation at the modulation frequency based on self-focusing of an amplitude modulated super Gaussian laser beam in ripple density plasma when pondermotive nonlinearity is operative.
研究成果
The study demonstrates that the self-focusing of an amplitude-modulated super Gaussian laser beam in ripple density plasma can efficiently generate THz radiation at the modulation frequency. By considering higher order terms in the paraxial ray approximation and optimizing the laser beam and plasma parameters, the efficiency of THz radiation can reach up to 6.5%. This method presents a promising approach for high-efficiency THz radiation generation.
研究不足
The study is theoretical and relies on numerical simulations. Experimental validation is required to confirm the findings. The efficiency of THz radiation generation is dependent on the optimization of laser beam and plasma parameters, which may be challenging to achieve in practice.
1：Experimental Design and Method Selection:
The study involves the propagation of an amplitude-modulated super Gaussian laser beam in a preformed ripple density plasma. The eikonal in paraxial ray approximation (PRA) along with higher order terms in the expansion of the dielectric function are considered.
2：Sample Selection and Data Sources:
The plasma parameters are set for a long pulse or continuous wave (CW) CO2 laser with specific intensity, initial radius, frequency, and modulated frequency.
3：List of Experimental Equipment and Materials:
A CO2 laser with specified parameters is used to propagate through a homogeneous, collision-less, and un-magnetized plasma.
4：Experimental Procedures and Operational Workflow:
The laser beam's self-focusing effect is studied numerically by solving coupled ordinary differential equations that describe the beam's propagation and interaction with the plasma.
5：Data Analysis Methods:
The efficiency of THz radiation is calculated by comparing the THz radiation energy to the incident laser beam energy, using numerical computational methods.
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