I2和Cr3+液芯光纤中的共振吸收拉曼散射光谱研究

Study on I2 and Cr3+ Resonance Absorption Raman Spectra in Liquid-Core Optical Fibers

作者: 专业:光学 导师:衣汉威 年度:2010 学位:硕士  院校: 长春理工大学

Keywords

iodine, trivalent chrome ion, liquid-core fiber, Raman spectra

        利用液芯光纤,拉曼光谱的强度可以提高103倍。共振拉曼光谱技术可以将拉曼光谱的强度提高106倍。液芯光纤中的共振吸收拉曼散射,可使拉曼光谱的强度提高109倍。用长1.3m、内径为500μm的液芯光纤,波长为532nm、功率为37mw的激光激发获得了I2在CS2的共振拉曼光谱,其浓度为0.024g/L,发现了一条在吸收池的共振吸收激发中没有出现的新谱线。对比CrCl3溶液和红宝石共振拉曼散射实验可以看出,Cr3+特征峰的出现取决于它所处的介质和激发的波长。改变液芯光纤的长度,当光源波长为632.8nm,芯里的液体是CS2和CCl4混合溶液(CS2:CCl4=1:4)光纤的长度为0.83m时,波长为570.1nm的反斯托克斯拉曼光谱的强度达到最大。因此,对于波长为570.1nm的拉曼散射光来说CS2和CCl4混合溶液光纤的最佳长度为0.83m。
    Intensity of the Raman spectra can be enhanced 103 times using liquid-core optical fiber. The intensity of the Raman spectra was enhanced 106 times by the means of resonance Raman spectra. The intensity of Raman spectral lines can be increased by 109 times by the resonance Raman absorption effect in a liquid-core optical fiber. The Raman spectrum of I2 in CS2 was obtained in optical fiber (1.3m,500μm) by 37mw laser with 532nm wavelength, its concentration is 0.024g/L. A new Raman spectral line of I2 solution by resonance absorption in a liquid-core fiber was found in the experiment which was not found in the absorptive cell by resonance absorption exited. Compared spectrum of CrCl3 solution exited by resonance absorption with ruby Raman spectrum exited by resonance absorption, it is shown that appearance of characteristic peaks of Cr3+ depends on medium around it and wavelength of the exiting laser,Length of a liquid-core fibor is changed, when the fiber in which solution is CS2 and CCl4 mixture (CS2:CCl4 t:4) has its 0.83m length intensity of anti-Stokes Raman scattering line with 570.1nm wavelength exited by laser with 632.9nm has maximum value. So for the 570.1nm Raman scattering spectral line the optimum length of optical fiber with CS2 and CCl4 mixture in its core is 0.83m.
        

I_2和Cr~(3+)液芯光纤中的共振吸收拉曼散射光谱研究

摘要4-5
ABSTRACT5
目录6-7
第一章 绪论7-11
    1.1 拉曼光谱的优势和发展历史7-8
    1.2 拉曼光谱的发展前景8-9
    1.3 液芯光纤的历史与发展9
    1.4 本文主要研究内容9-10
    1.5 选题的意义10-11
第二章 拉曼散射11-29
    2.1 概述11
    2.2 拉曼散射的经典理论11-13
    2.3 拉曼散射简单量子理论13-14
    2.4 拉曼散射的全量子理论14-17
    2.5 拉曼散射的偏振17-18
    2.6 拉曼峰的强度18-19
    2.7 定量分析和定性分析19-21
    2.8 拉曼光谱的噪声及其减除方法21-24
    2.9 共振拉曼效应24-29
第三章 光纤传输的基本特性29-35
    3.1 光纤的历史29
    3.2 光纤的技术基础29-30
    3.3 光纤的衰减30-32
    3.4 液芯光纤32-33
    3.5 液芯光纤的损耗系数和最佳长度33-35
第四章 实验研究35-40
    4.1 吸收池方法的实验装置及光谱检测仪器35-38
    4.2 液芯光纤的制作38-40
第五章 结果讨论40-47
    5.1 CCl_4和CS_2混合溶液(CCl_4:CS_2=1:4:)液芯光纤的最佳长度40-41
    5.2 碘溶液的共振拉曼光谱41-43
    5.3 三价铬离子的共振拉曼光谱43-46
    5.4 实验误差46-47
结论47-48
致谢48-49
参考文献49-50
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