偶氮乙基橙掺杂聚乙烯醇薄膜自衍射效率的动态特性分析

摘要/Abstract

摘要：

两束强度相等的相干光小角度在乙基橙－聚乙烯醇(EO/PVA)膜中耦合时，产生自衍射现象．我们对自衍射效率的动态特性进行了实验研究,实验表明：(1)当入射光强较小（I＝100mW/cm2）时，一阶衍射效率η随照射时间的延长从零上升至一稳定值；(2)入射光强较大（I＝480mW/cm2）时，一阶衍射效率η 从零开始迅速上升到一最大值η_m后再降至一稳定值η_s. 以耦合光在膜中的干涉光场对trans-cis态的分子数分布进行调制而形成的粒子数光栅为模型，对衍射效率的动态特性进行了理论分析,理论与实验结果相符合。

关键词: 非线性光学, 自衍射, 粒子数光栅, 乙基橙

Abstract:

When two coherent beams illuminate into the ethyl orange doped polymer film with small angle and equal intensity, the phenomena of self diffraction occur. We explored the dynamic characteristic of self-diffraction efficiency experimentally. The experiment results are the following: 1) The diffraction efficiency η increases monotonously from zero to a stable value ηs with the illumination time illuminated by lower intensity（I＝100mW/cm2）. 2) The diffraction efficiency η increases to a maximum ηm at first and then decreases to a stable value ηs illuminated by higher intensity. We analyzed the phenomenon theoretically by the model of population grating, which is formed by the molecules populations of trans and cis modulated by the coherence optical field. The theoretical results are consistent with the experimental results.

Key words: nonlinear optics, self-diffraction, model of population grating, ethyl orange

中图分类号:

O437

杨秀芹. 偶氮乙基橙掺杂聚乙烯醇薄膜自衍射效率的动态特性分析[J]. J4, 2011, 28(2): 178-182.

YANG Xiu-qin . Characteristics of self-diffraction efficiency of ethyl orange polymer film[J]. J4, 2011, 28(2): 178-182.

参考文献

[1] Durbin S. D., Arakelian S. M., Shen Y. R., Strong optical diffraction in a nematic liquid crystal with high nonlinearity[J]. Opt.Lett., 1982,7( 4): 145-147.
[2] Webb D.J., Eston S.J., and Solymar L.,Solymar, Observations of diffraction and self-diffraction effects during two-wave mixing in a nematic liquid crystalJ]. Opt. Commun.,1992, 89(2-4):283–288
[3] Scott M.L. and Elson J.M., Multilayer light scattering and the laser gyro [J]. Appl. Phys. Lett., 1980,32(3): 158-161
[4] Sanchez F., Kayoun P.R., and Huihnard J.P., Two-wave mixing with gain in liquid crystals at 10.6-(mu) m wavelength[J]. J. Appl. Phys.1988, 64:26–31
[5] Etbschole D.R., Solymar L., Takacs J., and Wilson T., Higher diffracted orders in a BSO crystal: an experimental study of transients[J]. Appl. Phys. B, 1989, 49(5): 431–433
[6] Eichler H.J., Glotz M., Kummrow A., Richter K et al, Picosecond pulse amplification by coherent wave mixing in silicon[J]. Phys. Rev. A, 1987,35(11): 4673–4678
[7] Ravindra Kumar G., Bhanu P. Singh, Sharma K. K., Continuous-wave self- diffraction in dye-doped glasses[J]. J. Opt. Soc. Am. B, 1991, 8(10): 2119– 2127
[8] Zhang Chunping, Chen Guiying, Song, Q. Wang, etal, Analysis of higher-order self-diffraction of low-power continuous wave based on nonlinear transmission of bR film[J]. J. Modern Opt., 2004, 51(2):285–296
[9] Guo Zong-Xia, Chen Gui-Ying, Zhang Chun-Ping et al, Dynamic behaviour of self-diffraction in bacteriorhodop- sin film[J]. Chin. Phys. Lett., 2004, 21(12): 2418–2421
[10] Chen Guiying, Zhang Cunping et al, Time-dependent all-optical logic gates based on two coupled waves in bacteriorhodopsin film[J]. Journal of Applied Physics, 2005, 98(4):044504 - 044504-5 [11] Guiying Chen, Chunping Zhang et al, Real-time intensity-dependent all-optical switch of reverse image converter from wavelength to wavelength based on bacteriorhodopsin film[J]. Optics. Commun. 2005, 249(4-6): 563-568
[12] Wang Pei,Ming Hai,Liang Zhongcheng et al., Photoinduced birefringence and optical storege in azobenzene side-chain polyner liquid crystral film[J]. Chinese Journal of Quantum Electronics(量子电子学报),2002,19(4):358-362(in Chinese)
[13] Fei Haosheng, Wei Zhenqian, Wu Pengfei et al, Biphoton holographic storage on Methyl Orange and Ethyl Orange dyes[J]. Optics Letters, 1994, 19(6):411-413
[14] Wang Pei, Ming Hai, Zhang Jiangying et al, Study on Long-time Optical Storage Based on Photoinduced Birefringence in Azobenzene Side-chain Liquid Crystal Polymer Film[J]. Chinese Journal of Quantum Electronics(量子电子学报), 2003, 20(1): 104-108 (in Chinese)
[15] Todarov T, Nikolava L, Tomova N, Polarization holography 1: Anew high efficiency organic material with reversible photoinduced birefringence[J]. Appl.Opt.1984, 23(12):4390-43
[16] Dos Santos Jr D S, Mendonca C R, Balogh D T, et al, Chromophore aggregation hampers photoisomerization in Langmuir Blodgett films of stearoyl ester of Disperse Red-13
[J]. Chem Phys Lett, 2000, 317(1):1-5
[17] Tawa K, Kamada K, Sakaguchi T, et al, Local environment dependence of photoinduced anisotropy observed in azo dye doped polymer films[J]. Polymer, 2000, 41, (17):3235-3242
[18] Enns.R. H. and Rangnekar. S.S., Diffraction by a laser induced thermal phase grating[J]. Canadian, Journal of Physics, 1974, 52 99-109
[19] Yavrian A., Asatryan K., Galstian T., Piche M.，Real-time holographic image restoration in azo dye doped polymer films[J], Optics Commun., 2005, 251 (4-6): 286–291