本文選題：吸收光譜 + 海底激光通信　； 參考：《河南師范大學(xué)》2017年碩士論文

【摘要】：葉綠素銅鈉鹽(SCC)作為葉綠素的衍生物之一,因其固有的綠色特性,對熱、光、酸、堿等具有較好的穩(wěn)定性,以及獨特的抗菌能力,特殊的除臭性能,因此其應(yīng)用遍及食品添加劑、化妝品添加劑、醫(yī)學(xué)等方面。作為金屬卟啉的葉綠素銅鈉鹽,由于它具有獨特的電子能帶結(jié)構(gòu)和光子轉(zhuǎn)換性能吸引了大量關(guān)注。與此同時,近年來,水下激光成像、水下光學(xué)無線通信和海洋勘探已成為熱門領(lǐng)域。海水的成分非常復(fù)雜,這或多或少會降低海底激光傳輸?shù)男阅堋Ｒ虼吮疚膶Σ煌瑵舛热~綠素銅鈉鹽溶液的散射和吸收特性進(jìn)行了測量和研究。為了促進(jìn)葉綠素銅鈉鹽在材料科學(xué)、能源研究和光子學(xué)領(lǐng)域的發(fā)展,如高速光通信,以及用于制作非線性光學(xué)材料、太陽能光伏電池、全光開關(guān)、光限制器和可飽和吸收器等器件,我們應(yīng)致力于研究葉綠素銅鈉鹽的非線性光學(xué)特性(NLO)。本文測量不同濃度葉綠素銅鈉鹽溶液的散射、吸收特性以及非線性光學(xué)特性。其吸收光譜的結(jié)果表明,葉綠素銅鈉鹽表現(xiàn)出兩個特征吸收峰,不同特征吸收峰出現(xiàn)于405 nm和630 nm波長處,并且特征吸收峰隨溶液濃度的增加而增大。405 nm和532nm的擬合曲線表明,405nm處吸收系數(shù)與濃度呈指數(shù)關(guān)系,532nm處二者成正比。我們還發(fā)現(xiàn)處于磁場環(huán)境下和未處于磁場環(huán)境下葉綠素銅鈉鹽的激光傳輸特性相類似。然后根據(jù)實驗結(jié)果,我們繪制了激光透射率和光斑半徑隨輸入光強變化的圖像,可以清楚地看到,在葉綠素銅鈉鹽溶液濃度較低時,散射隨著輸入光強線性變化。在葉綠素銅鈉鹽溶液濃度較高時,最初散射隨著輸入光強的增加而減小,但隨著光強增加到一定強度,散射反而開始隨著輸入光強的增加而增加,希望這些發(fā)現(xiàn)能對水質(zhì)監(jiān)測,水下激光成像和潛艇激光通信的研究提供一些方便。本文還采用Z掃描技術(shù)來判斷葉綠素銅鈉鹽溶液非線性折射率(n_2)的大小與符號、非線性吸收系數(shù)(β)和三階非線性光學(xué)極化率(χ~((3)))的實部和虛部。結(jié)果表明,葉綠酸銅鈉鹽呈現(xiàn)反飽和吸收現(xiàn)象,非線性折射率為負(fù),屬于自散焦效應(yīng)。n_2、β和χ~((3))的數(shù)值與葉綠素銅鈉鹽溶液濃度呈線性關(guān)系,即當(dāng)濃度增加時這些參數(shù)數(shù)值也會變大。由此可以看出,葉綠酸銅鈉鹽具有良好的光學(xué)非線性,將會為其應(yīng)用于材料科學(xué)、能源研究和光子學(xué)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.
【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】：O645.163

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