叶绿素铜钠盐溶液在可见光范围内的光谱特性研究

发布时间：2018-05-11 00:05

本文选题：吸收光谱 + 海底激光通信　；参考：《河南师范大学》2017年硕士论文

【摘要】：叶绿素铜钠盐(SCC)作为叶绿素的衍生物之一,因其固有的绿色特性,对热、光、酸、碱等具有较好的稳定性,以及独特的抗菌能力,特殊的除臭性能,因此其应用遍及食品添加剂、化妆品添加剂、医学等方面。作为金属卟啉的叶绿素铜钠盐,由于它具有独特的电子能带结构和光子转换性能吸引了大量关注。与此同时,近年来,水下激光成像、水下光学无线通信和海洋勘探已成为热门领域。海水的成分非常复杂,这或多或少会降低海底激光传输的性能。因此本文对不同浓度叶绿素铜钠盐溶液的散射和吸收特性进行了测量和研究。为了促进叶绿素铜钠盐在材料科学、能源研究和光子学领域的发展,如高速光通信,以及用于制作非线性光学材料、太阳能光伏电池、全光开关、光限制器和可饱和吸收器等器件,我们应致力于研究叶绿素铜钠盐的非线性光学特性(NLO)。本文测量不同浓度叶绿素铜钠盐溶液的散射、吸收特性以及非线性光学特性。其吸收光谱的结果表明,叶绿素铜钠盐表现出两个特征吸收峰,不同特征吸收峰出现于405 nm和630 nm波长处,并且特征吸收峰随溶液浓度的增加而增大。405 nm和532nm的拟合曲线表明,405nm处吸收系数与浓度呈指数关系,532nm处二者成正比。我们还发现处于磁场环境下和未处于磁场环境下叶绿素铜钠盐的激光传输特性相类似。然后根据实验结果,我们绘制了激光透射率和光斑半径随输入光强变化的图像,可以清楚地看到,在叶绿素铜钠盐溶液浓度较低时,散射随着输入光强线性变化。在叶绿素铜钠盐溶液浓度较高时,最初散射随着输入光强的增加而减小,但随着光强增加到一定强度,散射反而开始随着输入光强的增加而增加,希望这些发现能对水质监测,水下激光成像和潜艇激光通信的研究提供一些方便。本文还采用Z扫描技术来判断叶绿素铜钠盐溶液非线性折射率(n_2)的大小与符号、非线性吸收系数(β)和三阶非线性光学极化率(χ~((3)))的实部和虚部。结果表明,叶绿酸铜钠盐呈现反饱和吸收现象,非线性折射率为负,属于自散焦效应。n_2、β和χ~((3))的数值与叶绿素铜钠盐溶液浓度呈线性关系,即当浓度增加时这些参数数值也会变大。由此可以看出,叶绿酸铜钠盐具有良好的光学非线性,将会为其应用于材料科学、能源研究和光子学方面提供新思路。
[Abstract]:As one of the derivatives of chlorophyll, sodium copper chlorophyll (SCC) has good stability to heat, light, acid and base, as well as its unique antibacterial ability and special deodorization performance, due to its inherent green properties, such as heat, light, acid, alkali and so on. Therefore, it is widely used in food additives, cosmetics additives, medicine and so on. Sodium copper chlorophyll, as a metalloporphyrin, has attracted much attention because of its unique electronic band structure and photonic conversion properties. At the same time, in recent years, underwater laser imaging, underwater optical wireless communication and ocean exploration has become a hot area. The composition of seawater is very complex, which more or less reduces the performance of undersea laser propagation. Therefore, the scattering and absorption characteristics of sodium copper chlorophyll solution with different concentrations have been measured and studied. In order to promote the development of sodium copper chlorophyll in materials science, energy research and photonics, such as high-speed optical communications, as well as for the manufacture of nonlinear optical materials, solar photovoltaic cells, all-optical switches, For devices such as optical limiter and saturable absorber, we should study the nonlinear optical properties of sodium copper chlorophyll. The scattering, absorption and nonlinear optical properties of sodium copper chlorophyll solution with different concentrations were measured. The absorption spectra showed that there were two characteristic absorption peaks in sodium copper chlorophyll, different characteristic absorption peaks appeared at 405 nm and 630 nm wavelength. The curve of characteristic absorption peak increases with the increase of solution concentration. The fitting curves of 405nm and 532nm show that the absorption coefficient of 405nm is exponentially proportional to the concentration at 532nm. We also found that the laser propagation characteristics of sodium copper chlorophyll in magnetic field and not in magnetic field are similar. Based on the experimental results, the laser transmittance and the radius of the spot vary with the input light intensity. It can be clearly seen that the scattering varies linearly with the input light intensity when the concentration of sodium copper chlorophyll solution is low. When the concentration of sodium copper chlorophyll solution is high, the initial scattering decreases with the increase of input light intensity, but with the increase of light intensity to a certain extent, the scattering begins to increase with the increase of input light intensity. It is hoped that these findings can monitor the water quality. The research of underwater laser imaging and submarine laser communication provides some convenience. Z scan technique is also used to determine the size and symbol of nonlinear refractive index of sodium copper chlorophyll solution, the real and imaginary parts of nonlinear absorption coefficient (尾) and third order nonlinear optical polarizability (蠂 ~ (2). The results showed that the sodium copper chlorite showed reverse saturation absorption, and the nonlinear refractive index was negative. The values of self-defocusing effect, 尾 and 蠂 ~ (2 +) were linear with the concentration of sodium copper chlorophyll, and the results showed that there was a linear relationship between the concentration of sodium copper chlorophyllin and the concentration of sodium copper chlorophyllin. In other words, the values of these parameters also increase as the concentration increases. It can be seen that sodium copper folate has good optical nonlinearity and will provide new ideas for its application in material science, energy research and photonics.
【学位授予单位】：河南师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O645.163

【参考文献】