哈工大信息光学Chapter9-1.pdfVIP

幻 灯 片 1 Chapter 9 Holography Tao Geng College of Science Harbin Engineering University 幻 wavefront reconstruction：波前重建 灯 Lensless：无透镜 片 Historical Introduction holography ：全息术 2 n In 1948, Dennis Gabor proposed a novel two -step, lensless revolution：革命 imaging process which he called wavefront reconstruction and which we now know as holography. n Gabor followed his original proposal with two more lengthy papers published in 1949 and 1951, considering the possible application of holography to microscopy. n In the 1950s, a number of authors, including G.L. Rogers, H.M.A.EL-Sum, and A. W. Lohmann, significantly extended the theory and understanding of holography. n It was not, however, until the early 1960s that a revolution in holography began. 幻 灯 片 The wavefront reconstruction 3 n Recording Amplitude and Phase Object wave Object Reference wave Recording medium 幻 Amplitude:振幅 灯 Wavefront：波阵面 片 4 The intensity of the sum of two complex fields then depends on both the amplitude and phase of the unknown field. Thus if a(x , y ) a(x ,y ) e