To investigate the effects of laser pulses with different polarization parameters on the motion and power radiation distribution of high-energy electrons at different initial positions in the laser field, an electron laser collision model is established on the basis of the basic equations of electromagnetism, and the spatial distribution characteristics of the electron oscillating radiation at different initial positions under different polarization parameters are simulated with the help of MATLAB software analysis. It is shown that with the increase of polarization parameter from 0 to 1, the spatial radiation distribution generated by collision with electrons at different positions shows a bimodal transition to the surrounding area; when the initial position is certain, the radiation distribution gradually decreases and flattens with the increase of the polarization parameter; and when the polarization parameter is certain, the radiation distribution shows small changes with the change of the initial position. At the same time, it is found that the maximum value of stereo angle radiation per electron unit space occurs at the polarization parameter of 0.7 with the electrons initially located on the z positive semi-axis at a position 30μm from the origin.
In our study, we delve into the effect of laser beam waist radius variations on the interaction of an ultra-tightly focused laser with off-axis electrons. We find that off-axis collisions are the most common case in our experiments, which highlights the relevance of our study. Under ultra-tight focusing conditions (b0=Λ0), the electrons are subjected to a qualitative force that is asymmetric in the x+ axis directions and x -axis directions, leading to trajectory deviations and accelerated oscillations. At the same time, the electron radiated power and spectrum exhibit a clear asymmetry, which gradually diminishes as the beam waist radius increases, with increasing peak radiated power and decreasing full width half maximum. These findings are crucial for the generation of ultrashort pulses, especially in the field of ultrashort optics, and are important for applications utilizing nonlinear inverse Thomson scattering radiation.
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