一种红敏光致聚合物全息特性的研究
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摘要
光致聚合物作为一种全息存储材料因其诸多的优点而备受关注,其中在以丙稀酰胺为单体、亚甲基蓝为光敏剂的光致聚合物系统内,研究工作者加入了各种多功能性单体以改善材料的全息性能,但不同程度地存在着诸如:材料均匀性不好、易产生过曝光等问题而使得在记录衍射光栅的过程中出现光栅稳定性差的问题,影响了所记录的全息图的质量。由此我们合成了以丙烯酸和N,N’-亚甲基双丙稀酰胺共同作为单体、三乙醇胺为引发剂、亚甲基蓝为光敏剂和聚乙烯醇为预聚物的光致聚合物膜,在样品内采用记录透射型衍射光栅的方法对其基本全息特性进行了详细的研究:
1.从其透过率与曝光时间的变化关系及衍射效率随曝光能量的变化曲线研究了该光致聚合物膜的均匀性。
2.从不同曝光强度、不同厚度、分辨率和分光比四个方面研究了该光致聚合物膜的曝光特性;并且根据曝光特性曲线算出了不同厚度时的曝光灵敏度、折射率调制度、动态范围等参数。
3.研究了该光致聚合物膜的暗区短暂扩散现象。
4.在以上实验的基础上研究了该光致聚合物膜的布拉格偏移。
5.在所制样品内进行了数字全息存储实验,对再现数据页的强度进行了统计分析和计算出了信噪比。
6.根据染料亚甲基蓝的化学特性在所制样品内进行了多波长存储。
7.在原有组分不变的基础上加入了丙稀酰胺单体,主要研究了其它组分及其浓度不变时丙烯酸和丙稀酰胺在三种配比下,在相同曝光强度下不同厚度时衍射效率与曝光时间之间的变化关系和在厚度相同时曝光强度与衍射效率之间的变化关系。
Photopolymer materials recently have gained attention because they have many advantages, which make them more suitable for applications as holographic storage materials. Especially in the photopolymerizable systems which were composed of acrylamide as monomer and Methylene Blue as photoinitiator, many researchers have improved the holographic characteristics by using all kinds of bifunctional monomers. But unfortunately there were many questions to some degree during recording the diffraction gratings, such as the poor homogeneity, the overmodulation of the refraction index, which would affect the quality of holograms recorded. So the photopolymerizabl- e system used in the experiments was consisted of acrylic acid and N,N’-methylenebisa- crylamide as monomers, triethanolmine as coinitiator, photoinitiated by Methylene Blue, and all the components were supported in a film of polyvinylalcohol. The fundamental holographic characteristics were studied in details by recording the transmission diffraction gratings.
1. The homogeneity was studied by the variations of the transmittance as function of the exposure time and the diffraction efficiency as function of the exposure energy.
2. The exposure characteristics were studied on the different exposure intensity, the different thickness, the spatial frequency and the beam ratio. So the holographic parameters, such as energetic sensitivity, modulation index and dynamic range, were attained in terms of the exposure characteristics of the different thickness of the materials.
3. The dark diffusion of the photopolymer was studied.
1.从其透过率与曝光时间的变化关系及衍射效率随曝光能量的变化曲线研究了该光致聚合物膜的均匀性。
2.从不同曝光强度、不同厚度、分辨率和分光比四个方面研究了该光致聚合物膜的曝光特性;并且根据曝光特性曲线算出了不同厚度时的曝光灵敏度、折射率调制度、动态范围等参数。
3.研究了该光致聚合物膜的暗区短暂扩散现象。
4.在以上实验的基础上研究了该光致聚合物膜的布拉格偏移。
5.在所制样品内进行了数字全息存储实验,对再现数据页的强度进行了统计分析和计算出了信噪比。
6.根据染料亚甲基蓝的化学特性在所制样品内进行了多波长存储。
7.在原有组分不变的基础上加入了丙稀酰胺单体,主要研究了其它组分及其浓度不变时丙烯酸和丙稀酰胺在三种配比下,在相同曝光强度下不同厚度时衍射效率与曝光时间之间的变化关系和在厚度相同时曝光强度与衍射效率之间的变化关系。
Photopolymer materials recently have gained attention because they have many advantages, which make them more suitable for applications as holographic storage materials. Especially in the photopolymerizable systems which were composed of acrylamide as monomer and Methylene Blue as photoinitiator, many researchers have improved the holographic characteristics by using all kinds of bifunctional monomers. But unfortunately there were many questions to some degree during recording the diffraction gratings, such as the poor homogeneity, the overmodulation of the refraction index, which would affect the quality of holograms recorded. So the photopolymerizabl- e system used in the experiments was consisted of acrylic acid and N,N’-methylenebisa- crylamide as monomers, triethanolmine as coinitiator, photoinitiated by Methylene Blue, and all the components were supported in a film of polyvinylalcohol. The fundamental holographic characteristics were studied in details by recording the transmission diffraction gratings.
1. The homogeneity was studied by the variations of the transmittance as function of the exposure time and the diffraction efficiency as function of the exposure energy.
2. The exposure characteristics were studied on the different exposure intensity, the different thickness, the spatial frequency and the beam ratio. So the holographic parameters, such as energetic sensitivity, modulation index and dynamic range, were attained in terms of the exposure characteristics of the different thickness of the materials.
3. The dark diffusion of the photopolymer was studied.
引文
[1] 干福熹 主编,数字光盘存储技术,科学出版社,1998
[2] 干福熹 主编,数字光盘和光存储材料,上海科学出版社,1992
[3] 戎霭伦,陈强,光数据存储的新进展,物理,2001,30(1):6~17
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[9] 赵业权,王峰,王锐等,超大容量光学体全息存储技术与材料的研究动态,高技术通讯,2002,5:107~110
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[1] 姚华文,黄明举,陈仲裕等,多种单体的全息光聚物材料的组分的优化,光学学报,2002, 22(5):632~635
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[2] 干福熹 主编,数字光盘和光存储材料,上海科学出版社,1992
[3] 戎霭伦,陈强,光数据存储的新进展,物理,2001,30(1):6~17
[4] 陶世荃 主编,光全息存储,北京工业大学出版社,1998
[5] 魏劲松,张约品,干福熹等 ,近场光存储及其研究进展,物理学进展,2002,22(2):188~197
[6] 孙利群,章恩耀,王佳等,基于近场光学超衍射分辨力的高密度光存储,光电 子·激光,2001 年,12(6):646~651
[7] 黄著,唐列志,梁瑞生,光谱烧孔技术,光学技术,2000,26(4):379~382
[8] 虞家骥,光谱烧孔:下一代光存储技术,物理,1992,21(6):355~364
[9] 赵业权,王峰,王锐等,超大容量光学体全息存储技术与材料的研究动态,高技术通讯,2002,5:107~110
[10] 王凤涛,何庆声,王建岗等,大容量高密度体全息数据存储,光学技术,2002, 28(1):6~8
[11] 李伟,谢长生,裴先登,体全息存储技术,光学技术,2001,27(3):283~288
[12] J. F. Heanue, M. C. Bashaw, and L. Hesselink, Volume holographic storage and retrieval of digital data, Sscience, 1994, 265(5):749~752
[13] 徐敏,郑庸,江铁良等, 散斑随机相移器,北京工业大学学报,1983,9(1):69~75
[14] E. G. Pack, and D. Psaltis, Optical associative memory using Fourier transform hologram, Opt. Eng., 1987, 26:428~433
[15] M. Yamaguchi, H.Endoh, T. Honda, et al., High-quality recording of a fullparalax holographic stereogram with a digital diffuser, Opt. Lett., 1994, 19(2):1351~37
[16] 黄德群,单振国,干福熹,新型光学材料,科学出版社,1989
[17] A. Akella, S. L. Sochava, and L. Hesselink, Synthesis and characterization of photochromic organic films for holographic recording, Opt. Lett., 1997, 22(12):919 ~921
[18] V. Weiss, A. A. Friesem, and V. Krongauz, Organic materials for real-time holographic recording, J. Imag. Sci., 1997, 41(4):3713~3722
[19] Willis S. Colburn, Review of materials for holographic optics, J. Imag. Sci. Tech., 1997, 41(5):443~456
[20] W.S.Colburn, K.A.Haines, Volume hologram formation in photopolymer materials, Appl. Opt., 1971, 10 (7):1636~1641
[21] R.H.Wopschall, T.R.Pampalone, Dry Photopolymer Film for Recording Holograms, Appl. Opt., 1972, 11 (9):2096~2104
[22] W.K. Smother, T.J.Trout, A.M.Weber,et al., Hologram recording in DuPont’s new photopolymer materials, IEE Conf.Pub., 1989, 311:184~189
[23] G.Zhao, P.Mouroulis, Diffusion model of hologram formation in dry photopolymer materials, J.Mod.Opt., 1994.41:1929~1939
[24] C.S.Vikram, U.S.Rhee, J.Caulfield, et al., Dynamics of hologram recording in DuPont photopolymer, Appl. Opt., 1995, 34 (5):846~853
[25] S. Poazzolla, B.K.Jenkins. Holographic grating formation in photopolymers, Opt. Lett., 1996, 21 (14):1075~1077
[26] V.L.Colvin, R.G.Larson, A.L.Harris, et al., Quantitative model of volume hologram formation in photopolymers, J.Appl.Phys., 1997, 81(9):5913~5923
[27] I.Aubrecht, M.Miler, I.Koudela, Recording of holographic diffraction gratings in photopolymers: theoretical modelling and real-time monitoring of grating growth, J.Mod.Opt., 1998, 45 (7):1465~1477
[28] J.H.Kwon, H.C.Hwang, K.C.Woo, Analysis of temporal behavior of beams diffrac- ted by volume gratings formed in photopolymers, J.Opt.Soc.Am.B, 1999, 16(10):1651~1657
[29] J.T.Sheridan, J.R.Lawrence, Nonlocal-response diffusion model of holographic recording in photopolymer, J.Opt.Soc.Am.A, 2000, 17 (6):1108~1114
[30] J.R.Lawrence, F.T.O’Neill, J.T.Sheridan, Photopolymer holographic recording material parameter estimation using a nonlocal diffusion based model, J.Appl.Phys ., 2001, 90 (7):3142~3148
[31] J.R.Lawrence, F.T.O’Neill, J.T.Sheridan, Adjusted intensity nonlocal diffusion model of photopolymer grating formation, J.Opt.Soc.Am.B,2002,19(4):621~629
[32] F.T.O’Neill, J.R.Lawrence, J.T.Sheridan, Comparison of holographic photopolymer materials by use of analytic nonlocal diffusion models, Appl. Opt., 2002, 4 (5):845 ~852
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