Stilbene 420溶液的荧光特性及非线性效应研究

发布时间：2018-05-17 16:23

本文选题：染料激光 + Stilbene　；参考：《河南师范大学》2017年硕士论文

【摘要】：关于激光在水下通信技术的应用,要求激光的波长范围需要在420-532nm之间。而Stilbene 420这种染料在受355nm激光激发时输出中心波长425nm的激光,输出范围为419-434nm,正处于海水的低吸收区,恰好满足这一要求。所以关于Stilbene 420的光学特性的研究对水下通信及军事反潜等领域是很有必要的。所以本文对Stilbene420染料溶液进行了实验研究和探讨分析,从多方面来了解Stilbene 420染料的各种光学特性。利用高精度荧光光谱仪测得了Stilbene 420溶液分别在三种不同波长泵浦下的荧光光谱,当激光为405nm激光时,溶液的荧光波长是390-550nm,波峰位置出现在420nm处,波峰位置处荧光的能量与溶液浓度成正相关关系;当泵浦激光为450nm的激光时,荧光波长范围是550-700nm,波峰位置在621nm处,波峰处荧光能量随溶液浓度的增高而增加;当泵浦激光为532nm的激光时,荧光波长范围是550-750nm,波峰位置处于619nm处,荧光能量与溶液浓度成正比。总结来说,就是对于同一波长的泵浦激光,溶液的荧光能量与溶液浓度成正比。通过给光路加上平行磁场来研究磁场对Stilbene 420染料激光的透过率,从而探究磁场对其产生的光偏转。实验结果证明,对于同一浓度的溶液,在固定波长的泵浦激光激发下,当磁场强度增加时,激光透过率也增加,也就是透过率与磁场强度成正比,磁场强度越强,光偏转越明显。对比同一泵浦激光下的不同浓度的溶液,发现当磁场强度固定时,溶液的激光透过率与溶液浓度在一定范围内成正比。使用Z-扫描技术对Stilbene 420染料溶液的光学非线性进行了探究,根据实验数据结合各种实验参数对所得结果进行了处理,证实Stilbene 420染料溶液确实具有光学非线性,并且稳定的激发光源激发下,溶液的非线性与溶液浓度正相关。主要探究了Stilbene 420溶液的荧光特性和非线性光学效应。观测了Stilbene 420染料溶液的荧光光谱,通过模块化多功能光栅光谱仪实验测得不同波长的泵浦激光作用下Stilbene 420染料溶液的荧光光谱,对比了不同Stilbene 420染料溶液浓度的荧光特性。并研究了磁场对Stilbene 420染料溶液透过率的影响,比较了恒定磁场对不同浓度Stilbene 420染料溶液的激光透过率的影响。研究结果表明:Stilbene 420溶液的荧光光谱呈宽带结构,荧光强度随着溶液浓度的增加而增强;激光透过率随着磁场强度的增加而增强,并随着溶液浓度的增加而增强。Stilbene 420染料溶液的非线性折射系数为负,具有较明显的现象。
[Abstract]:For the application of laser in underwater communication technology, the wavelength range of laser must be between 420-532nm. However, the Stilbene 420 dye is in the low absorption region of seawater when it is excited by 355nm laser, and the output range of the 425nm laser is 419-434 nm, which meets this requirement. So it is necessary to study the optical properties of Stilbene 420 for underwater communication and military antisubmarine. In this paper, the experimental study and analysis of Stilbene420 dye solution are carried out, and the optical properties of Stilbene 420 dye are studied from many aspects. The fluorescence spectra of Stilbene 420 solution pumped by three different wavelengths were measured by using a high precision fluorescence spectrometer. When the laser is a 405nm laser, the fluorescence wavelength of the solution is 390-550 nm, and the peak position appears at the 420nm. The fluorescence energy at the peak position is positively correlated with the concentration of the solution, when the laser is pumped by 450nm, the fluorescence wavelength ranges from 550-700 nm, and the peak position is at the 621nm, and the fluorescence energy at the peak increases with the increase of the concentration of the solution. When the pump laser is a 532nm laser, the fluorescence wavelength ranges from 550 to 750 nm, the peak is located at the 619nm, and the fluorescence energy is proportional to the concentration of the solution. To sum up, the fluorescence energy of the solution is proportional to the concentration of the solution for the pump laser of the same wavelength. The transmittance of the magnetic field to the Stilbene 420 dye laser is studied by adding a parallel magnetic field to the optical path, and the optical deflection of the magnetic field to the dye laser is investigated. The experimental results show that for the solution of the same concentration, the laser transmittance increases when the magnetic field intensity increases under the excitation of a fixed wavelength pumped laser, that is, the transmittance is directly proportional to the magnetic field intensity, and the stronger the magnetic field intensity is, The deflection of light is more pronounced. It is found that the laser transmittance of the solution is proportional to the concentration of the solution in a certain range when the magnetic field intensity is fixed compared with the solution of different concentration under the same pump laser. The optical nonlinearity of Stilbene 420 dye solution was investigated by using Z- scan technique. The results were processed according to the experimental data and various experimental parameters. It was proved that the Stilbene 420 dye solution had optical nonlinearity. And the nonlinearity of the solution is positively correlated with the concentration of the solution under the excitation of a stable excitation source. The fluorescence characteristics and nonlinear optical effects of Stilbene 420 solution were investigated. The fluorescence spectra of Stilbene 420 dye solution were observed. The fluorescence spectra of Stilbene 420 dye solution were measured by modularized multifunction grating spectrometer. The fluorescence characteristics of Stilbene 420 dye solution were compared with those of different concentration of Stilbene 420 dye solution. The influence of magnetic field on the transmittance of Stilbene 420 dye solution was studied, and the influence of constant magnetic field on the laser transmittance of Stilbene 420 dye solution with different concentration was compared. The results show that the fluorescence spectra of the solution of: Stilbene 420 are wideband, and the fluorescence intensity increases with the increase of the concentration of the solution, and the laser transmittance increases with the increase of the magnetic field intensity. The nonlinear refraction coefficient of Stilbene 420 dye solution was increased to negative with the increase of solution concentration.
【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】：TQ610.1;TN24

【参考文献】