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研究了在自散焦介质中诱导光束聚焦过程中椭圆高斯光束对光束聚焦的影响。通过数值计算讨论了在不同初始抽运光束振幅、初始光束间距和波长比情况下椭圆高斯光束对信号光束聚焦的影响。影响光束聚焦过程的方程参量和初始条件共有6个,即两光束波长比(方程参量)、抽运光束和信号光束的初始振幅、两光束初始中心间距和两光束X、Y初始束宽比。采用此理论模型验证了Hickmann在1992 年得出的实验结果,数值计算结果表明理论结果能够和实验结果定量地吻合。
The effect of elliptic Gaussian beam on the beam focusing during induced beam focusing in self-defocusing media was studied. The effects of elliptical Gaussian beam on signal beam focusing under different initial pump beam amplitudes, initial beam spacings and wavelength ratios are discussed numerically. There are altogether 6 equation parameters and initial conditions that affect the beam focusing process. That is, the ratio of the wavelength of the two beams (the equation parameter), the initial amplitude of the pump beam and the signal beam, the initial center distance of the two beams and the initial beam width ratio of the two beams. The theoretical model was used to verify the experimental results obtained by Hickmann in 1992. The numerical results show that the theoretical results can be quantitatively consistent with the experimental results.