本文選題：銩離子 + 硅酸鹽玻璃　； 參考：《華南理工大學》2015年碩士論文

【摘要】：光纖激光器作為二十一世紀的新型激光源已經(jīng)歷了1.0μm、1.5μm的快速發(fā)展,正朝著中紅外波段方向邁進,特別是2.0μm波段激光源。2.0μm波段激光在軍事、醫(yī)療、空間通信等領域具有不可替代的作用。目前,雖然在石英和多種多組分玻璃光纖中已實現(xiàn)了2.0μm波段的激光輸出,但是受制于高增益、高損傷閾值2.0μm波段光纖材料的缺乏,導致2.0μm波段脈沖光纖激光器的峰值功率難以進一步提高。石英光纖損耗低,制備工藝成熟,但是稀土離子溶解度較低,嚴重限制了其有源光纖增益的提高。而硅酸鹽玻璃,具有穩(wěn)定的物化性能、高的機械強度和良好的抗激光損傷閾值。并且,通過對硅酸鹽玻璃組分的選擇和調(diào)整,有望大幅度提高玻璃的稀土離子溶解度,進而獲得高增益2.0μm波段有源光纖,為高峰值功率2.0μm波段脈沖光纖激光器奠定材料基礎。本課題通過調(diào)整硅酸鹽玻璃的組分和制備工藝,優(yōu)化玻璃的光譜特性和拉絲性能,研究了摻銩硅酸鹽玻璃光纖制備技術、光纖的性能以及它們間的相互關系。內(nèi)容包括:(1)研究了硅酸鹽玻璃組分對Tm3+:2.0μm波段發(fā)光性能的影響:在不同濃度Tm2O3摻雜的Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3玻璃中,我們發(fā)現(xiàn)1 mol%Tm2O3摻雜樣品的發(fā)光強度最大,并計算了此時Tm3+離子的三個J-O強度參數(shù)Ω2、Ω4、Ω6,其值分別為4.05、0.78和0.32,進而計算的1836 nm處的自發(fā)輻射壽命為5.96 ms。計算的最大吸收截面σabs為1.57×10-21 cm2,最大發(fā)射截面σem為3.34×10-21 cm2,最大增益系數(shù)為1.58 cm-1。這些較大的參數(shù)值表明此玻璃比較適合制備高增益摻銩硅酸鹽玻璃光纖。(2)硅酸鹽玻璃去除OH-的研究:研究發(fā)現(xiàn),反應氣氛法(O2+CCl4)除水方式對Si O2-Al2O3-Ca O-Ba O-Sb2O3玻璃的除水效果最好。但是,由于硅酸鹽玻璃的熔制溫度仍然較高,在除水氣氛作用下,會引起Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3玻璃中Na2O、K2O的大量揮發(fā);在玻璃組分中引入氟化物并鼓入O2除水時,延長O2鼓泡時間和增加氟化物含量均有利于OH-的消除,并可提高摻銩Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3玻璃的熒光強度,但降低了Si O2-Al2O3-Ca O-Ba O-Sb2O3玻璃的拉絲抗析晶性能。(3)Cr3+增強Tm3+:2.0μm波段熒光強度的研究:在1 mol%Tm2O3摻雜的Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3-Tm2O3玻璃中引入Cr2O3,發(fā)現(xiàn)Cr2O3摻雜濃度為0.1 mol%時,采用430 nm氙燈激發(fā),Cr3+→Tm3+之間的能量傳遞效率為40.97%;而采用808 nm LD激發(fā)時,Cr3+能有效增強Tm3+:2.0μm波段的熒光強度。但是,隨著Cr2O3含量的增加,Tm3+:2.0μm波段的熒光強度隨之下降。同時,我們結合能級圖分析了Tm3+/Cr3+之間的能量傳遞機理。(4)摻銩硅酸鹽玻璃光纖的制備研究:通過對玻璃組分的調(diào)整,優(yōu)選出了適合制備硅酸鹽玻璃光纖的玻璃配方,并采用管棒法拉制出了數(shù)值孔徑為0.136,纖芯和包層直徑分別為9.8μm和125μm的摻銩硅酸鹽玻璃光纖。經(jīng)截斷法測試,光纖在1310 nm處的光傳輸損耗為19.01 d B/m。
[Abstract]:As a new type of laser source in the 21 century, fiber laser has experienced the rapid development of 1.0 渭 m and 1.5 渭 m, and is moving towards the mid-infrared band, especially the 2.0 渭 m laser source in military and medical fields. Space communication and other fields have an irreplaceable role. At present, the laser output of 2.0 渭 m band has been realized in quartz and multicomponent glass fiber, but it is limited by the lack of 2.0 渭 m optical fiber material with high gain and high damage threshold. It is difficult to improve the peak power of 2.0 渭 m pulsed fiber laser. The loss of quartz fiber is low and the preparation process is mature, but the solubility of rare earth ions is low, which seriously limits the increase of the gain of active fiber. Silicate glass has stable physical and chemical properties, high mechanical strength and good laser damage threshold. Moreover, by selecting and adjusting the composition of silicate glass, the solubility of rare earth ions of the glass will be greatly improved, and then the high gain 2.0 渭 m band active fiber will be obtained, which will lay the material foundation for the high peak power 2.0 渭 m band pulsed fiber laser. By adjusting the composition and preparation process of silicate glass, the spectral and wire drawing properties of glass were optimized, and the preparation technology of thulium doped silicate glass fiber, the properties of fiber and the relationship between them were studied. The effects of the composition of silicate glasses on the luminescence properties of TM 3: 2.0 渭 m band were studied. In Sio _ 2-Na _ 2O -K _ 2O-Ba O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3 glasses doped with TM _ 2O _ 3, the luminescence intensity of the doped samples was the highest. The three J-O intensity parameters 惟 _ 2, 惟 _ 4 and 惟 _ 6 of the TM ~ 3 ion are calculated, and the values are 4.05 ~ 0.78 and 0.32, respectively, and the calculated spontaneous emission lifetime at 1836 nm is 5.96ms. The calculated maximum absorption cross section 蟽 _ (abs) is 1.57 脳 10 ~ (-21) cm ~ (-2), the maximum emission section 蟽 _ (em) is 3.34 脳 10 ~ (-21) cm _ (2), and the maximum gain coefficient is 1.58 cm ~ (-1). These large parameter values indicate that the glass is more suitable for preparing high gain thulium doped silicate glass fiber. The study of removing OH- from silicate glass: it is found that the reaction atmosphere method can remove water from Sio 2 Al 2O 3 Ca O BA O Ba O O SB 2O 3 glass with the best water removal efficiency. However, because the melting temperature of silicate glass is still relatively high, it will cause a large amount of volatilization of Na _ 2O-K _ 2O-Ba O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3 glass in Sio _ 2-Na _ 2O-K _ 2O-Ba _ (O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3) glass under the action of removing water. Prolonging the time of O2 bubbling and increasing the content of fluoride can improve the fluorescence intensity of thulium doped Sio _ 2-Na _ 2O-K _ 2O-Ba O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3 glass. But the crystallization resistance of Sio _ 2-Al _ 2O _ 3-Ca O _ -Ba O-Sb _ 2O _ 3 glass was decreased. The results showed that Cr _ 2O _ 3 was used to increase the fluorescence intensity of TM _ 3: 2.0 渭 m band. When the concentration of Cr _ 2O _ 3 was 0.1 mol%, Cr _ 2O _ 3 was introduced into Sio _ 2-Na _ 2O _ 3-K _ 2O-Ba O-Nb _ 2O _ 3-Al _ 2O _ 3-Tm _ 2O _ 3 glass doped with Si _ 2-Al _ 2O _ 3-Ca _ 2O _ 3-Al _ 2O _ 3. The energy transfer efficiency between Cr 3 and TM 3 excited by 430 nm xenon lamp is 40.97, while that of Cr 3 excited by 808 nm LD can effectively enhance the fluorescence intensity of TM 3: 2.0 渭 m band. However, with the increase of Cr _ 2O _ 3 content, the fluorescence intensity of TM _ 3: 2.0 渭 m wave band decreases with the increase of Cr _ 2O _ 3 content. At the same time, we analyze the energy transfer mechanism between TM ~ 3 / Cr _ 3 and TM ~ (3 / Cr _ (3). The preparation of thulium doped silicate glass fiber is studied. By adjusting the composition of glass, the formula of glass suitable for preparing silicate glass fiber is selected. The thulium doped silicate glass fibers with a numerical aperture of 0.136, diameter of 9.8 渭 m and cladding diameter of 125 渭 m were fabricated by using tube rod Farah. The optical transmission loss of the fiber at 1310 nm is 19.01 dB / m ~ (-1) by truncation method.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN253;TQ171.112

【參考文獻】

相關期刊論文 前1條

1 張姝;何芳;孫偉麗;姚艷萍;;應用2μm銩(Tm)激光器行前列腺手術的護理[J];全科護理;2012年36期

相關博士學位論文 前1條

1 張云軍;包層泵浦摻Tm～（3+）光纖激光器的研究[D];哈爾濱工業(yè)大學;2006年

相關碩士學位論文 前1條

1 賈明;新型摻鐿激光玻璃的研制[D];中南大學;2004年

，

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