|
|||||
|
|
Elimination of zero-order diffraction and conjugate image in off-axis digital holography |
|
| Authors: | Lihong Ma Hui Wang Yong Li |
| Affiliation: | 1. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University , Hangzhou 310027, People's Republic of China;2. Institute of Information Optics, Zhejiang Normal University , Jinhua 321004, People's Republic of China;3. Institute of Information Optics, Zhejiang Normal University , Jinhua 321004, People's Republic of China |
| Abstract: | The presence of zero-order diffraction and a conjugate image in digital holography essentially diminishes the quality of the reconstructed image. In this paper, a novel method that adopts numerical operation to eliminate the zero-order diffraction and conjugate image is presented. The whole process needs only one hologram and a complex finite impulse response (FIR) digital filter. The method of numerical elimination is simple; it filters the hologram directly in the spatial domain instead of in the frequency domain. The design of a complex finite impulse response filter is described in detail. The experimental results demonstrate that the operation can completely eliminate the zero-order diffraction and conjugate image and significantly enhance the quality of the reconstructed image. |
| Keywords: | digital holography zero-order diffraction conjugate image complex FIR filter |