Holographic ultrafiche.

Even though photographic emulsions exist that are capable of attaining the theoretical resolution for a given wavelength of light, the lack of reliability in recording conventional images at very high reduction ratios has tended to limit greatly the useful storage density of photographic film. Holographic recording techniques offer a means for attaining the necessary reliability, thereby making the recording of many pages at high reduction ratios feasible. Some tasks that are difficult in conventional recording are in fact quite easy in holographic recording. Generally, the characteristics of holographic recording are very different from recording conventional microimages. We discuss the techniques and problems of holographic ultrafiche recording and indicate our progress in this area.