漂白型位相ホログラム
1971 年 40 巻 1 号 p. 41-48
詳細
1971 年 40 巻 1 号 p. 41-48
Experiments concerning bleaching techniques are carried out with the object of obtaining phase holograms of high quality. Phase gratings are made on the photographic plates (Kodak 649 F) through several kinds of bleaching processes.
The highest diffraction efficiency of 70% (at 6328 A) is obtained through the process using chromium intensifier as the bleaching agent and thioglycollic acid as the stabilizer. The process using potassium ferricyanide as the bleaching agent gives a diffraction efficiency of only 50% but shows the highest stability. Prehardening the emulsion before these processes improves (1) the correlation between the diffraction efficiency and the photographic density (before bleaching), and (2) the spatial frequency characteristics. The latter process with prehardening is applied for making a fourier-transformed hologram memory whose diffraction efficiency, signal to noise ratio and signal nonuniformity are 8%, 40 and 2. 3, respectively.
