Kubota T, Ose T, Sasaki M, Honda K
Appl Opt. 1976 Feb 1;15(2):556-8. doi: 10.1364/AO.15.000556.
The spectral sensitization of hardened dichromated gelatin to red light is carried out using methylene blue as sensitizer. The sensitized dichromated gelatin plate can be stored for over 1 month in an ammonia atmosphere without loss of photosensitivity. Holograms recorded in the sensitized dichromated gelatin using a He-Ne laser have high diffraction efficiency and low noise if they are swelled at a temperature near the gelatin gel melting point during development processing. Maximum diffraction efficiency has been found to be as high as 88%. The energy required to obtain 80% diffraction efficiency is 150-400 mJ/cm(2).
