title: Computer simulation study of nonlinear imaging properties for two phase-typed scatterers.
abstract: Nonlinear imaging of two phase-typed scatterers in super-Gaussian laser beams is modeled and its properties obtained by computer simulation are presented. The formations of hot images and second-order hot images are verified. It is found that the in-beam locations of hot images correspond to those of the scatterers, but that there can be only one second-order hot image, which is at the middle point between the in-beam locations of the scatterers. Interestingly, the image intensity can be suppressed and it increases in an oscillating manner with some regularity as the distance between the scatterers increases. Moreover, one more scatterer makes the effect of the B integral and that of the phase shift caused by scatterers quite different from the predictions for single-scatterer case. The variation trend of hot image intensity with the B integral is not in agreement with that described by the analytical result for the single-scatterer case. The variation of phase shift caused by the scatterers can result in two peaks in the variation of hot image intensity with it, and the phase shift corresponding to the larger peak is approximately half the predicted result for the single-scatterer case. These results indicate that the number of scatterers has a significant influence on nonlinear imaging.
authors.affiliation: School of Computer Science and Engineering, Hunan University of Science and Technology, Xiangtan, China. jbxu@hnust.cn
authors.forename: Jianbo
authors.initials: J
authors.lastname: Xu
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Hu
authors.forename: Hui
authors.initials: H
authors.lastname: Zhuo