本文選題：染料激光 + Stilbene��； 參考：《河南師范大學(xué)》2017年碩士論文

【摘要】：關(guān)于激光在水下通信技術(shù)的應(yīng)用,要求激光的波長范圍需要在420-532nm之間。而Stilbene 420這種染料在受355nm激光激發(fā)時輸出中心波長425nm的激光,輸出范圍為419-434nm,正處于海水的低吸收區(qū),恰好滿足這一要求。所以關(guān)于Stilbene 420的光學(xué)特性的研究對水下通信及軍事反潛等領(lǐng)域是很有必要的。所以本文對Stilbene420染料溶液進(jìn)行了實驗研究和探討分析,從多方面來了解Stilbene 420染料的各種光學(xué)特性。利用高精度熒光光譜儀測得了Stilbene 420溶液分別在三種不同波長泵浦下的熒光光譜,當(dāng)激光為405nm激光時,溶液的熒光波長是390-550nm,波峰位置出現(xiàn)在420nm處,波峰位置處熒光的能量與溶液濃度成正相關(guān)關(guān)系;當(dāng)泵浦激光為450nm的激光時,熒光波長范圍是550-700nm,波峰位置在621nm處,波峰處熒光能量隨溶液濃度的增高而增加;當(dāng)泵浦激光為532nm的激光時,熒光波長范圍是550-750nm,波峰位置處于619nm處,熒光能量與溶液濃度成正比�？偨Y(jié)來說,就是對于同一波長的泵浦激光,溶液的熒光能量與溶液濃度成正比。通過給光路加上平行磁場來研究磁場對Stilbene 420染料激光的透過率,從而探究磁場對其產(chǎn)生的光偏轉(zhuǎn)。實驗結(jié)果證明,對于同一濃度的溶液,在固定波長的泵浦激光激發(fā)下,當(dāng)磁場強度增加時,激光透過率也增加,也就是透過率與磁場強度成正比,磁場強度越強,光偏轉(zhuǎn)越明顯。對比同一泵浦激光下的不同濃度的溶液,發(fā)現(xiàn)當(dāng)磁場強度固定時,溶液的激光透過率與溶液濃度在一定范圍內(nèi)成正比。使用Z-掃描技術(shù)對Stilbene 420染料溶液的光學(xué)非線性進(jìn)行了探究,根據(jù)實驗數(shù)據(jù)結(jié)合各種實驗參數(shù)對所得結(jié)果進(jìn)行了處理,證實Stilbene 420染料溶液確實具有光學(xué)非線性,并且穩(wěn)定的激發(fā)光源激發(fā)下,溶液的非線性與溶液濃度正相關(guān)。主要探究了Stilbene 420溶液的熒光特性和非線性光學(xué)效應(yīng)。觀測了Stilbene 420染料溶液的熒光光譜,通過模塊化多功能光柵光譜儀實驗測得不同波長的泵浦激光作用下Stilbene 420染料溶液的熒光光譜,對比了不同Stilbene 420染料溶液濃度的熒光特性。并研究了磁場對Stilbene 420染料溶液透過率的影響,比較了恒定磁場對不同濃度Stilbene 420染料溶液的激光透過率的影響。研究結(jié)果表明:Stilbene 420溶液的熒光光譜呈寬帶結(jié)構(gòu),熒光強度隨著溶液濃度的增加而增強;激光透過率隨著磁場強度的增加而增強,并隨著溶液濃度的增加而增強。Stilbene 420染料溶液的非線性折射系數(shù)為負(fù),具有較明顯的現(xiàn)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.
【學(xué)位授予單位】：河南師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ610.1;TN24

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