Methylene blue dichromated-gelatin holograms: antihumidity method for taking off strongly adsorbing humidity groups.


A new, to our knowledge, method of modifying methylene bluedichromated-gelatin (MBDCG) holograms by use of ninhydrin andremoval of their amino groups and carboxyl groups, which stronglyadsorb humidity, has been developed. The modified MBDCG hologramsare stable for 1000-line/mm gratings (diffractional efficiency of95%) in a high-humidity environment… (More)