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Resolution problems in holography

The effect of the following factors degrading the resolution of the reconstructed holographic image have been studied: the angular misadjustment of the hologram or that of the reconstruction wave at reconstruction, the thickness variations of the hologram substrate, the Gaussian intensity profile of the auxiliary waves, and the finite spatial resolution of the recording medium. The above effects have been studied in five recording geometries with point and line sources. Practical tolerances of certain parameters for maintaining image quality were given where is was applicable. It was the unevenness of the substrate that proved to be the cause of the most serious degradation of the reconstructed image. Some experimental demonstrations are also shown. In conclusion, practical rules for recording high resolution holograms are given.