Abstract: A systematic investigation is carried out on the optimization of diffraction efficiency (DE) of only methylene blue sensitized gelatin (MBG) holograms. The influence of the following factors on DE are studied: the concentration of methylene blue (Cm), the concentration of ammonium dichromate solution (Ca), swelling temperature (Ts), exposure (E) and the relative humidity of air (RH). This study shows that under the condition of Cm-0.009%; Ca- 5%; Ts within 35 - 45$DGR@C; E-150 mJ/cm$+2$/; RH within 45 - 65%, an optimum DE of over 80%, even 90% can be achieved in MBG holograms. In our experiments we find that a moderate DE(35%) is obtained without dichromate solution in post- processing. In order to know the role which the condition of bathing the plate in a dichromate solution plays and the photo-chemical mechanism of forming the interference pattern in the films, the X-ray spectra are made, the Cr$+3$PLU$/ ligands are not found; this means that the quantity of Cr$+3$PLU$/ ligands is too small to measure, even if its is existing in the processed film. These results can not be interpreted with the normal photo-chemical mechanism of forming the holograms.!7
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机译：摘要：对仅亚甲基蓝敏化明胶（MBG）全息图的衍射效率（DE）的优化进行了系统的研究。研究了以下因素对DE的影响：亚甲蓝（Cm）的浓度，重铬酸铵溶液（Ca）的浓度，溶胀温度（Ts），暴露（E）和空气的相对湿度（RH）。研究表明，在Cm-0.009％的条件下;钙-5％; Ts在35-45 $ DGR @ C之间; E-150 mJ / cm $ + 2 $ /;在MBG全息图中，RH可以达到45-65％，最佳DE可以超过80％，甚至90％。在我们的实验中，我们发现在后期处理中无需重铬酸盐溶液即可获得中等DE（35％）。为了了解板在重铬酸盐溶液中的浸浴条件所起的作用以及在膜中形成干涉图样的光化学机理，制作了X射线谱图，Cr $ + 3 $ PLU $ /找不到配体;这意味着Cr $ + 3 $ PLU $ /配体的数量太少而无法测量，即使已存在于加工过的薄膜中也是如此。这些结果不能用形成全息图的正常光化学机理来解释。7
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