NEW PHOTOTECHNOLOGY SUITABLE FOR RECORDING PHASE HOLOGRAMS AND SIMILAR INFORMATION IN HARDENED GELATIN

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Abstract
Novel phototechniques are described for the formation of phase holograms in hardened gelatin. These techniques result in recordings similar to those produced with the well‐known dichromated gelatin process; however, several major advantages arise from these new approaches. Photographic speeds several orders of magnitude (102–105) faster than dichromated gelatin are readily obtained together with panchromatic response characteristics. Moreover, like dichromated gelatin but distinct from bleached silver halides, the stored information is not affected by intense blue or uv irradiation (40 W/cm2 at 4880 Å).