In this paper, the motion trajectories, radiation spatial distribution, time spectrum and spectrum distribution of electrons during the interaction between circularly polarized pulses with different chirps are studied. The motion state and radiation distribution during electron and pulse interaction were calculated and obtained by 4-5Runge-Kutta- Fehlberg method (RKF45). The visualization of motion trajectory and radiation distribution is realized by data fitting and MATLAB simulation. The effects of chirp parameters on the radial contraction of electron trajectory, the increase of peak radiation power, the adjustment of peak radiation generation time, and the vortex coupling of radiation spatial distribution are studied. In general, this paper provides an important reference for further understanding and application of chirped pulses in optics and physics by deeply studying the characteristics of electrons under different conditions of Gaussian circularly polarized laser chirped pulses.
To improve the characteristics of nonlinear Thomson scattering radiation, a numerical study is conducted on the motion characteristics and radiation properties of stationary electrons driven by circularly polarized negatively chirped laser pulses with different pulse widths. The results indicate that as the pulse width increases, electron radiation collimation decreases, while the azimuth angle is insensitive to pulse width changes. In the time spectrum, the peak radiation power reaches the order of 108 to 109, showing new characteristics with pulse width variation. The peak radiation power exhibits an extremum rather than increasing with decreasing pulse width, providing a practical method for modulating ultra-short pulse radiation sources. In terms of the observation direction of peak radiation power, the radiation spectrum broadens with increasing pulse width, and radiation monochromaticity decreases, indicating that there is an optimal pulse width for negatively chirped laser pulses that allows strong peak radiation power with minimal monochromaticity attenuation.
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