The multiplexed holographic gratings can achieve simultaneously three-dimensional imaging of an object with the Bragg
selectivity. The recording conditions of multiplexed holograms for imaging different depths of the object space are
investigated experimentally. We find that the cross talk can be ignored when ΔΖ is approximately more than 2ΔΖFWHM, and the cross talk is degenerate with the increase of the depth separation. Further we adopt the point-spread function
(PSF) of the imaging system to estimate depth resolution of the volume holographic imaging system. Then to avoid
image overlap we examine multiplexed holograms recorded with different Δθ. We also calculate Δθ theoretically, and find that the theoretical value is consistent with the experimental result. The optimized holographic gratings are used to image the resolution target which is located at the different longitudinal positions to simulate a 3D object. The results
demonstrate that the resolution target located at the two different depths can be reconstructed and clearly imaged on
CCD.
In this paper the reconstructing images of a tiny object with a volume hologram are investigated by examining the effect
of Bragg mismatch on the quality of imaging. The imaging depth resolutions of the volume holograms with the different
radii are compared. Furthermore, the simultaneous imaging ability of the volume holographic gratings for the different
depths of the object space is demonstrated experimentally by recording two holographic gratings in the same material.
The results show that the depth resolution of the VHI system is 2.1mm in our experiments, in which a volume hologram
is recorded in a 2-mm-thick LiNbO3:Fe:Cu crystal with two recording beams interfering at the wavelength of 532nm,
and is located at a working distance of f=75mm away from the object lens.
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