本文選題：激光晶體 + 晶體生長��； 參考：《暨南大學(xué)》2017年碩士論文

【摘要】：LD泵浦的全固態(tài)激光器具有高效率、結(jié)構(gòu)緊湊等優(yōu)點(diǎn),開展適合于LD泵浦的高效新型激光晶體研究仍然是近年激光材料領(lǐng)域的熱點(diǎn)。在新材料研究中,四鉬酸釓鋇晶體具有高度的無序性,可以提高摻雜稀土的離子濃度,展寬摻雜離子的吸收與發(fā)射光譜,具有良好的物理與化學(xué)穩(wěn)定性,有很好的商用價(jià)值。本文主要研究內(nèi)容包括下面幾個(gè)部分:1.系統(tǒng)地分析了鉬酸鹽類作為激光晶體的研究現(xiàn)狀和發(fā)展前景,指出四鉬酸釓鋇(BaGd_2(MoO_4)_4)晶體研究的必要性和研究目的。2.分別對(duì)Nd/Yb共摻和Yb/Tm共摻四鉬酸釓鋇(BaGd_2(MoO_4)_4)晶體進(jìn)行了生長技術(shù)研究。首先使用高溫固相法對(duì)兩類晶體進(jìn)行多晶原料高溫固相合成,然后通過單晶提拉法(CZ法)生長出了兩類單晶體并進(jìn)行了冷加工。3.對(duì)兩類晶體的理化性能進(jìn)行了系統(tǒng)表征。使用X射線衍射分析技術(shù)(XRD)對(duì)晶體結(jié)構(gòu)進(jìn)行了指認(rèn),并得到其晶格參數(shù),表明所生長的晶體為類白鎢礦結(jié)構(gòu)的BaGd_2(MoO_4)_4晶體,屬于單斜晶系,點(diǎn)群結(jié)構(gòu)為C2/c。使用ICP-AES分析法測試了晶體中所摻雜稀土離子的濃度,并計(jì)算了其分凝系數(shù)。使用熱重-差示熱掃描分析技術(shù)對(duì)晶體的熱學(xué)性質(zhì)進(jìn)行表征,得到BaGd_2(MoO_4)_4晶體的熔點(diǎn)為1070℃,且TG曲線為一條平滑的直線,說明其在高溫狀態(tài)下理化性質(zhì)穩(wěn)定。4.對(duì)兩類晶體的光譜性能進(jìn)行了系統(tǒng)的研究。使用紫外-可見-近紅外分光光度計(jì)測量了Nd/Yb:BaGd_2(MoO_4)_4和Yb/Tm:BaGd_2(MoO_4)_4晶體的吸收光譜,計(jì)算了其吸收截面,并基于J-O理論,計(jì)算了稀土離子Nd~(3+)、Tm~(3+)的J-O強(qiáng)度參數(shù)、自發(fā)輻射躍遷幾率、熒光分支比與輻射壽命,并對(duì)兩對(duì)Nd/Yb和Yb/Tm稀土離子之間的能量傳遞過程進(jìn)行了分析。通過對(duì)兩類稀土離子共摻雜的晶體進(jìn)行熒光光譜測試,表明了摻雜10at.%Nd~(3+)/10at.%Yb~(3+):BaGd_2(MoO_4)_4晶體的熒光峰強(qiáng)度明顯弱于摻雜濃度為5at.%Nd~(3+)/10at.%Yb~(3+):BaGd_2(MoO_4)_4晶體,并且隨著Nd~(3+)濃度的升高其輻射壽命逐漸降低。而對(duì)于Yb/Tm:BaGd_2(MoO_4)_4晶體的熒光光譜分析表明,在1809 nm發(fā)射峰處,其發(fā)射帶寬為176 nm,并隨著Yb離子摻雜濃度的升高,其發(fā)光相對(duì)強(qiáng)度逐漸增強(qiáng),表明該類晶體具有1.8μm可調(diào)諧激光輸出的潛能。
[Abstract]:The LD pumped all solid state laser has the advantages of high efficiency and compact structure. It is still a hot spot in the field of laser materials to develop a new type of high efficiency laser crystal suitable for LD pump in recent years. In the study of new materials, four gadolinium molybdate crystal has a high degree of disorder, which can increase the ion concentration of doped rare earth and broaden the absorption of doped ions. The absorption and emission spectra have good physical and chemical stability and have good commercial value. The main contents of this paper include the following parts: 1. the research status and development prospect of molybdic acid salts as laser crystals are systematically analyzed. The necessity and purpose of the study on the study of the crystal of barium gadolinium (BaGd_2 (MoO_4) _4) are pointed out and the purpose of the study is.2. points. The growth technology of Nd/Yb co adulterated with Yb/Tm Co doped with four gadolinium molybdate (BaGd_2 (MoO_4) _4) crystals was studied. First, high temperature solid phase synthesis of polycrystalline materials was carried out by high temperature solid-phase method. Then two kinds of single crystals were grown by single crystal drawing (CZ method) and the physical and chemical properties of two kinds of crystals were processed by cold processing.3.. The X ray diffraction analysis (XRD) is used to identify the crystal structure and obtain its lattice parameters. It shows that the crystal is BaGd_2 (MoO_4) _4 crystal of the structure of scheelite and belongs to the monoclinic system. The point group structure is C2/c. using ICP-AES analysis to test the concentration of rare earth ions doped in the crystal and calculate the concentration of the doped rare earth ions in the crystal. The thermal properties of the crystal are characterized by thermogravimetric differential thermal scanning analysis. The melting point of BaGd_2 (MoO_4) _4 crystal is 1070, and the TG curve is a smooth straight line. It shows that the physicochemical properties of the crystal at high temperature are stable and.4. has a systematic study on the spectral properties of the two kinds of crystals. The absorption spectra of Nd/Yb:BaGd_2 (MoO_4) _4 and Yb/Tm:BaGd_2 (MoO_4) _4 crystals were measured by the near-infrared spectrophotometer, and the absorption cross sections were calculated. Based on the J-O theory, the J-O strength parameters of the rare earth ions Nd~ (3+), Tm~ (3+), the spontaneous emission transition probability, the fluorescence branch ratio and the radiation life, and the two pairs of rare earth ions and the rare earth ions were calculated. The energy transfer process between two kinds of rare earth ions Co doped crystals is tested by the fluorescence spectra. It is shown that the fluorescence peak intensity of the doped 10at.%Nd~ (3+) /10at.%Yb~ (3+): BaGd_2 (MoO_4) _4 crystal is obviously weaker than the doping concentration is 5at.%Nd~ (3+) / 10at.%Yb~ (3+), and the concentration increases with the concentration. The radiation life of the Yb/Tm:BaGd_2 (MoO_4) _4 crystal has been gradually reduced, and the fluorescence spectrum analysis of the crystal shows that the emission bandwidth of the 1809 nm emission peak is 176 nm, and the relative intensity of the luminescence increases with the increase of the doping concentration of the Yb ions, indicating that the crystal has the potential of 1.8 u m tunable laser output.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O734;TN244

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