Characterization of high resolution photographic emulsion BB640 by holographic methods

The gap created in the last decade in the market of fine and ultra-fine grain silver halide emulsions with the withdrawal of the historical producers was filled in recent years with new products and manufacturers. We have studied with holographic techniques the emulsion BB640, with a mean grain size of 20 nm, and we have found out that we can easily reproduce the results obtained with the discontinued materials. Additionally, we have found new features with processing techniques not used with former emulsions, obtaining densities higher than 11. We have obtained very good results with spatial frequencies higher than 7000 l/mm and diffraction efficiencies higher than 70 %. The material, in its monochromatic or panchromatic version has been used to spatially and spectrally multiplex holograms obtaining very high diffraction efficiencies.