McMahon D H, Maloney W T
Appl Opt. 1970 Jun 1;9(6):1363-8. doi: 10.1364/AO.9.001363.
Although efficient high quality, bleached holograms have been made using photographic film, the tendency of the bleach products to darken upon exposure to light seriously limits their usefulness in many practical situations. Nevertheless, the great sensitivity of photographic emulsions makes their use in holography highly desirable. To shed light on the problem of stability, relative measurements of light induced darkening were made on heavily exposed plates bleached to yield one of the reaction products: silver chloride, silver bromide, silver iodide, and silver ferricyanide. We have found that the resistance of the emulsion to darkening increases significantly as the molecular weight of the halide ion is increased. Efficient, high quality, silver iodide holographic gratings usable over the wavelength range from 450 nm to 1200 nm, have been made which exhibit complete immunity to darkening when exposed to white light. Representative measurements of holograms made on Agfa 8E70 plates using the more stable emulsions are presented.
尽管使用照相底片已经制作出了高效、高质量的漂白全息图，但漂白产物在光照下会变黑的趋势在许多实际应用中严重限制了它们的实用性。然而，照相乳剂的高灵敏度使得其在全息术中的应用非常值得期待。为了阐明稳定性问题，我们对经过大量曝光并漂白以产生一种反应产物（氯化银、溴化银、碘化银和铁氰化银）的底片进行了光致变黑的相对测量。我们发现，随着卤离子分子量的增加，乳剂抗变黑的能力显著增强。已经制作出了在450纳米至1200纳米波长范围内可用的高效、高质量的碘化银全息光栅，当暴露在白光下时，这些光栅表现出完全抗变黑的特性。本文给出了使用更稳定乳剂在爱克发8E70底片上制作全息图的代表性测量结果。
