Abstract
The pre-magnification digital holography with a microscopic objective (MO) has become an important mean for imaging and measuring of microscopic objects. Based on Fresnel diffraction theory, the point spread function of digital off-axis Fresnel holographic system with pre-magnification is firstly deduced in detail. The lateral resolution of this imaging system is then analyzed. The amplitude distributions of the point spread functions of the MO, the holographic CCD and the whole imaging system are simulated respectively. Then, the matching requirements between MO and the holographic CCD are discussed. Some ambiguities about the resolution limitation in existing literatures are clarified. The results show that only when the image resolution of the holographic CCD is not below the imaging resolution of the MO, the resolution of overall system is dependent on the numerical aperture of the MO. Otherwise, it is dependent on the numerical aperture of the CCD. It is optimum to make the imaging resolution of the MO approach its limitation and be equal to or less than the resolution of the holographic CCD a little. The simulation results verify the validities of the theoretical analysis.
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