Compton散射下非傍轴光束的小尺度自聚焦

Small-scale Self-focusing of Non-paraxial Laser Beams under Compton Scattering

基于电子和多光子集团非线性Compton散射模型和非傍轴传输方程,得到了多光子非线性Compton散射下的小尺度调制增长率的表达式,讨论了入射与散射光形成耦合非傍轴光对小尺度自聚焦的影响.通过对非傍轴和傍轴情形下小尺度调制的增益谱分析,发现耦合非傍轴光对小尺度调制增益谱的影响程度与光强有关.与散射前相比,随光强的增强,影响更大,总趋势是使小尺度调制增长的截止频率、最快增长频率和最大增长频率迅速减小,而对截止频率和最快增长频率的影响比对最大增长频率的影响更大.

Using the model of the nonlinear Compton scattering of an electron and multi-photon group and the non-paraxial propagation equation, the small-scale self-focusing of the non-paraxial laser beams under the multi-photon nonlinear Compton scattering was studied, and the influence on the small-scale self-focusing taken place by the coupling optical formed by incident and scattered optical beams was discussed. An analytic expression for the gain spectrum was obtained. The results show that the influence on the small-scale self-focusing is related with the intensity of the coupling non-paraxial laser beam. The influence is bigger with the increase of the optical incident than that before the scattering. But the nonparaxiality exerts more influence on the cutoff frequency, the fastest growing frequency and the biggest growing frequency than on the maximum growth.