The photoinduced reversible color change between thermally stable and meta stable states of spiropyran molecules can modulate the absorption and the refractive index of the photochromic doped poly(vinylcarbazole) films. The effect of the exposure energy and the film thickness on the real-time diffraction efficiency was investigated. The optimal thickness for which the maximum diffraction efficiency is obtained was found to be around 30 $mu@m for an exposure energy greater than 1005 mJ/cm$+2$/. High efficiency erasable holographic recording at 350 nm was performed. A maximum diffraction efficiency of 13% was achieved for spiropyran doped poly(vinylcarbazole) films.
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机译：热稳定和元稳定状态之间的光抑制的可逆颜色变化螺吡喃分子可以调节光致变色掺杂聚（乙烯基咔唑）膜的吸收和折射率。研究了曝光能量和膜厚度对实时衍射效率的影响。获得最大衍射效率的最佳厚度为约30 $ mu @ m，曝光能量大于1005 mj / cm $ + 2 $ /。进行350nm的高效率可擦除全息记录。为螺掺杂聚（乙烯基咔唑）薄膜实现了13％的最大衍射效率。
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