【作者】 董光兴；

【导师】 朱建华；

【作者基本信息】 四川大学 ， 光学， 2005， 硕士

【摘要】 重铬酸盐明胶作为一种性能优良的全息记录材料,具有高分辨率、高衍射效率、高信噪比、低吸收等特点,已经在全息显示、全息光学元件、全息存储等方面获得了较好的应用。本文从提高亚甲基蓝敏化红敏明胶材料的感光灵敏度入手,优化材料配方、改进后处理工艺,获得了感光速度快、灵敏度高的红敏明胶全息记录材料,实验中制作出了高衍射效率和高信噪比的体积全息光栅和反射全息图,同时对该红敏明胶配方的感光成像机理进行了初步探讨。 在此基础上,提出了一种采用有机预膨胀剂来调节李普曼反射全息图再现波长的新方法,将水溶性的有机试剂丙稀酰胺作为预膨胀剂均匀加入亚甲基蓝敏化的重铬酸盐明胶(MBDCG)溶液中来制作全息干板,预膨胀剂在反射全息图的后处理阶段溶于水,明胶层发生均匀收缩,从而使再现波长向短波方向移动,通过控制丙稀酰胺浓度,可在整个可见光区大范围定量控制再现波长。 此外,在分析染料敏化重铬酸盐明胶全息记录材料的感光成像机理的基础上,通过在单乳胶层中引入新型光敏剂及增感助剂,采用高效的化学增感和物理增感新体系来提高光化学反应的量子产率,研制出了高性能的全色明胶全息记录新材料。该材料在可见光区有宽的光谱响应、高的感光灵敏度(20mJ/cm~2),高的衍射效率(85%),高的空间分辨率(4000lines/mm以上)。实验中我们以红绿蓝三原色激光作为记录光源,通过优化后处理配方及处理工艺,成功制作出了色饱和度好、衍射效率高的真彩色明胶全息图。预期该材料可在真彩色全息显示、多波长全息存储、全息光学元件的制作等方面有较好的应用价值。更多还原

【Abstract】 Dichromated gelatin (DCG) has excellent holographic recording performances such as high diffraction efficiency, high spatial resolution, high signal-to-noise ratio, etc., and has been developed into an important recording material for image display and holographic optical elements. As a promising holographic optical element, the Lippmann- type holographic reflector has found good applications as holographic notch filter, holographic beam-splitter mirror, solar energy concentrator, and single-channel wavelength selector in wavelength-multiplexed optical fiber communication system, etc.In this thesis, the red—sensitized gelatin recording materials with high imaging speed and photo —sensitivity are obtained by optimizing material recipe and post — processing procedures. The holographic volume gratings and reflection holograms having high diffraction efficiencies and signal —noise ratio are also fabricated experimentally. Meanwhile, the imaging mechanism of this optimized recipe is also discussed.In addition, a new technique was presented for adjusting the playback wavelength of Lippmann holograms recorded in methylene-blue sensitized dichromated gelatin (MBDCG). The main feature of this technique is introducing a water-soluble organic reagent into MBDCG photosensitive layer as preswelling reagent and wavelength adjuster. This method has wide wavelength adjustment range (up to 200 nanometers) and high signal-to-noise ratio, can be applied to quantitatively adjust the playback wavelength of reflection hologram by changing the concentration of preswelling reagent. Its possible applications includecolor image display, holographic optical elements, and optical anti-counterfeiting.We also did some new research in color holography on basis of MBDCG. By employing new types of multi-color photosensitizers and photochemical promoters to photo-crosslinking gelatin system, a high-quality single-layer panchromatic dichromated gelatin material is achieved for color holography. It has wide spectral response within the visible light region, high spatial resolution up to 20mj/cm2 for three-primary-color laser lines, high diffraction efficiency up to 85%, and high spatial resolution up to 40001ines/mm, ect. The Lippmann color holograms with high color saturation, high brightness and low noise are recorded successfully. It can be expected to have practical applications in the fields of true-color display holography, wavelength multiplexing holographic storage, and holographic optical elements.更多还原