Li Dong, Zhao Jianlin, Peng Tao, Cai Zhaobin
Institute of Optical Information Science and Technology, Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.
Appl Opt. 2009 Nov 10;48(32):6229-33. doi: 10.1364/AO.48.006229.
The evolution of an image with a local intensity minimum (LIM image) during hot image formation caused by translucent obscuration is theoretically and numerically investigated for the first time to our knowledge. The existence of the LIM image is proved, and the functional relationship describing the intensity of the LIM image is derived by using transfer matrix theory. Furthermore, the influences of the parameters of the obscuration and the nonlinear medium on the intensity of the LIM image are also discussed. The results show that the intensity of the LIM image increases with the increase of the amplitude coefficients of the obscuration, but declines with increasing the thickness of the nonlinear medium within a certain scope. We also found that the distance from the rear surface of the nonlinear medium to the LIM image plane is approximately equal to that from the obscuration plane to the rear surface of the nonlinear medium.
据我们所知，首次从理论和数值上研究了由半透明遮挡引起的热图像形成过程中具有局部强度最小值的图像（LIM图像）的演变。证明了LIM图像的存在，并利用传输矩阵理论推导了描述LIM图像强度的函数关系。此外，还讨论了遮挡和非线性介质的参数对LIM图像强度的影响。结果表明，LIM图像的强度随着遮挡幅度系数的增加而增加，但在一定范围内随着非线性介质厚度的增加而减小。我们还发现，非线性介质后表面到LIM图像平面的距离近似等于遮挡平面到非线性介质后表面的距离。
