研究目的
To extend helical terahertz radiation generation based on pump depletion and examine the improvement of results by considering an upward plasma density ramp.
研究成果
The study demonstrates that THz radiation generation can be enhanced by considering pump depletion and an upward plasma density ramp. The efficiency of THz generation is significantly affected by the plasma frequency and the adjustable slope of the density ramp. The resonance condition ωp ～ ?ω is crucial for higher THz radiation generation rates.
研究不足
The study is limited by the assumption of paraxial approximation and neglects the filamentation effect due to non-axial and ultra-high power lasers. The vectorial and nonparaxial effects could change THz radiation generation.
1：Experimental Design and Method Selection:
The study employs the cross-focusing of two coaxial laser beams in plasma to generate vortex terahertz radiation, considering pump depletion and plasma density inhomogeneity. The SDE method is used to derive governing equations for LG laser beam propagation under paraxial approximation.
2：Sample Selection and Data Sources:
The study uses two coaxial twisted laser beams with LG profiles propagating in a nonlinear plasma medium with periodic plasma density and a gradual plasma density ramp.
3：List of Experimental Equipment and Materials:
The setup involves laser beams with frequencies ω1 and ω2, polarized along the x-axis, and a plasma medium with linear density ramp n0e = n0(1 ± γZ).
4：Experimental Procedures and Operational Workflow:
The propagation of laser beams in plasma is analyzed, considering the ponderomotive force nonlinearity and pump depletion. The effect of plasma density ramp on THz radiation generation is examined.
5：Data Analysis Methods:
The study analyzes the evolution of laser beam width and THz radiation amplitude versus normalized propagation distance, employing numerical calculations to investigate the effects of various parameters.
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