||We solve the problems that the occur when the diverging object beam is utiligzd in fabrication of disk-type multiplex hologram. With diverged object wave, the reconstructed image is of rainbow color form top to bottom with severe distortion.|
Keeping the advantage of ligh magnification ratio using diverging object beam,we reform our reference beam form divergent convergent form. The converging reference wave is converged into a point on the symmetry axis of and behind the hologram. In the image reconstruction, a diverging reference wave brings out all the 2D images, each be observed at certain location. Hence, the observed image at the designated location is no longer generated from a large set of individual holograms and the image distortion is greatly reduced. Because there is a viewing point for each 2D image, the observed image is quite single-colored form top to bottom. In the holographic process, we adopt copying technique to not only increase the diffraction efficiency of the hologram but also enlarge the radius of the hologram disk. This solves the problems of low diffraction efficiency and small radius of the hologram disk occured when the converging object beam is utilized to record the hologram.
Finally, we use the LCD from the flashlight to reconstructed image and observe its variation when the viewing angle and the observation distance is changed. We also used MATLAB program to theoretically simulate the holographic process and compare the result with that from the experiment.
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