Dashdavaa Erkhembaatar, Erdenebat Munkh-Uchral, Shin Chang-Won, Kim Nam
Appl Opt. 2018 Jan 1;57(1):A50-A54. doi: 10.1364/AO.57.000A50.
In this paper, we present an algorithm for complex object wave extraction in off-axis digital holography using a time-multiplexing and frequency spectrum-shifting technique. The proposed approach utilizes the digital time-multiplexing technique, in which two 90-deg-rotated off-axis holograms are recorded in sequence, and corresponding spectra are subtracted in the computed Fourier domain to eliminate the DC term. Then, the two subtracted holograms are digitally multiplexed into one complex hologram in the same plane, and by shifting the spatial frequency spectra of the subtracted hologram in the spatial frequency domain, one of the two cross-correlations can be obtained in the center. This technique simply extracts the spectrum of the real image in the frequency domain than the spatial filtering method.
在本文中，我们提出了一种利用时分复用和频谱移位技术在离轴数字全息术中提取复杂物体波的算法。所提出的方法利用数字时分复用技术，其中依次记录两个旋转90度的离轴全息图，并在计算出的傅里叶域中减去相应的频谱以消除直流项。然后，将两个相减后的全息图在同一平面上数字复用到一个复数全息图中，并且通过在空间频域中移位相减后全息图的空间频谱，可以在中心获得两个互相关中的一个。与空间滤波方法相比，该技术只需在频域中提取实像的频谱。
