Xu Jianbo, Hu Yonghua, Zhuo Hui
School of Computer Science and Engineering, Hunan University of Science and Technology, Xiangtan, China.
J Opt Soc Am A Opt Image Sci Vis. 2011 Dec 1;28(12):2459-64. doi: 10.1364/JOSAA.28.002459.
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.
对超高斯激光束中两类相位型散射体的非线性成像进行了建模，并给出了通过计算机模拟获得的其特性。验证了热像和二阶热像的形成。发现热像在光束中的位置与散射体的位置相对应，但二阶热像只有一个，它位于散射体在光束中位置的中点。有趣的是，图像强度可以被抑制，并且随着散射体之间距离的增加，它会以某种规律振荡增加。此外，再多一个散射体使得B积分的效应以及由散射体引起的相移效应与单散射体情况的预测有很大不同。热像强度随B积分的变化趋势与单散射体情况的解析结果所描述的不一致。由散射体引起的相移变化会导致热像强度随其变化出现两个峰值，并且对应较大峰值的相移约为单散射体情况预测结果的一半。这些结果表明散射体的数量对非线性成像有显著影响。
