發(fā)布時(shí)間：2018-02-22 14:51

  本文關(guān)鍵詞： 超短脈沖 可飽和吸收體 二維拓?fù)洳牧?調(diào)Q 鎖模 碲化銻 Nd:YVO4 Nd:GYSGG　出處：《聊城大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在可飽和吸收體(SA)的發(fā)展歷程中,石墨烯的發(fā)現(xiàn)為之后的研究方向提供了一條極具價(jià)值的線索,石墨烯的迅猛發(fā)展使得類石墨烯材料備受關(guān)注。二維拓?fù)洳牧先邕^渡金屬二硫?qū)倩?Transition Metal Dichalcogenides TMDs)是典型的類石墨烯材料,它在電學(xué)、力學(xué)、光學(xué)及熱學(xué)等方向的諸多優(yōu)勢,使得其在各個(gè)領(lǐng)域被大量應(yīng)用。本文主要研究以二維拓?fù)洳牧蠟榭娠柡臀阵w產(chǎn)生超短脈沖的實(shí)驗(yàn)即研究它的可飽和吸收特性。產(chǎn)生超短脈沖通常主要通過調(diào)Q技和鎖模技術(shù)來實(shí)現(xiàn),其中被動(dòng)調(diào)Q和被動(dòng)鎖模技術(shù)因結(jié)構(gòu)簡單、穩(wěn)定性較好而被常用�？娠柡臀阵w作為其中不可或缺的調(diào)制元件一直備受關(guān)注,不斷尋找更加優(yōu)異的SA也成為研究人員的目標(biāo),從最初的染料可飽和吸收體、可飽和吸收鏡(SESAM),到后來的碳納米管、石墨烯,直至現(xiàn)今的二維拓?fù)洳牧?SA經(jīng)歷了一個(gè)漫長的發(fā)展史,超短脈沖的產(chǎn)生技術(shù)也在不斷進(jìn)步。本課題主要研究內(nèi)容有:1、論述了課題的研究背景和二維拓?fù)洳牧系难芯恳饬x及其制備方法;對被動(dòng)調(diào)Q或者說可飽和吸收體的研究進(jìn)展進(jìn)行了總結(jié)。2、制備了二硫化鉬可飽和吸收體,設(shè)計(jì)了基于它的Nd:GYSGG被動(dòng)調(diào)Q和調(diào)Q鎖模運(yùn)轉(zhuǎn),得到結(jié)果:對于被動(dòng)調(diào)Q運(yùn)轉(zhuǎn),當(dāng)泵浦功率為4 W,輸出功率為250 mW,光光轉(zhuǎn)換效率6.5%,最短脈沖寬度為833 ns,重復(fù)頻率為51 kHz;對于調(diào)Q鎖模運(yùn)轉(zhuǎn),當(dāng)泵浦功率為4 W,最大輸出功率為0.167 W,光光轉(zhuǎn)換效率為3.96%,調(diào)Q包絡(luò)中脈沖序列的重復(fù)頻率為87 MHz,鎖模脈沖寬度為260 ps。3、制備了二硫化鎢可飽和吸收體,設(shè)計(jì)了基于它的Nd:GYSGG被動(dòng)調(diào)Q和被動(dòng)鎖模激光器,得到結(jié)果:對于被動(dòng)調(diào)Q運(yùn)轉(zhuǎn),當(dāng)泵浦功率為4 W,輸出鏡分別為15%和27%時(shí),獲得最短脈沖分別為620 ns和591 ns,其對應(yīng)的序列重復(fù)頻率為67.35kHz和70.7kHz,光光轉(zhuǎn)換效率分別為9.2%和7.5%;對于調(diào)Q鎖模運(yùn)轉(zhuǎn),在泵浦功率為4 W時(shí)最大輸出功率為0.153 W,光光轉(zhuǎn)換效率為3.22%,調(diào)Q包絡(luò)中脈沖序列的重復(fù)頻率為78 MHz,鎖模脈沖寬度為307 ps。4、制備了碲化銻可飽和吸收體,設(shè)計(jì)了基于它的Nd:YVO4被動(dòng)鎖模激光器,獲得實(shí)驗(yàn)結(jié)果:調(diào)Q鎖模時(shí)在泵浦功率為2.3 W時(shí)最大輸出功率為0.119 W,光光轉(zhuǎn)換效率為3.79%,調(diào)Q包絡(luò)中脈沖序列的重復(fù)頻率為93.85 MHz,鎖模脈沖寬度為925ps。
[Abstract]:In the development of saturable absorber SA), the discovery of graphene provides a valuable clue for the future research. The rapid development of graphene has attracted much attention. Two-dimensional topological materials, such as transition Metal Dichalcogenides TMDs, are typical graphene like materials, which have many advantages in electrical, mechanical, optical and thermal fields. In this paper, the experiment of ultrashort pulse produced by two-dimensional topological material as saturable absorber is mainly studied, that is, the characteristic of saturable absorption of ultrashort pulse is studied. The generation of ultrashort pulse is usually by Q-switched. Technology and mode-locking technology to achieve, Among them, passive Q-switching and passive mode-locking techniques are commonly used because of their simple structure and good stability. From the original dye saturable absorber, saturable absorbent mirror, to carbon nanotubes, graphene, and now a two-dimensional topological material, SA, has undergone a long history of development. The generation technology of ultrashort pulse is also improving. The research background of the subject and the research significance of two-dimensional topological material and its preparation method are discussed in this paper. The research progress of passively Q-switched or saturable absorber is summarized. The molybdenum disulfide saturable absorber is prepared. Based on it, the passive Q-switched and Q-switched mode-locking operation of Nd:GYSGG are designed. The results are as follows: for passive Q-switched operation, When the pump power is 4 W, the output power is 250 MW, the optical and optical conversion efficiency is 6.5, the shortest pulse width is 833 ns, the repetition rate is 51 kHz. When the pump power is 4 W, the maximum output power is 0.167 W, the optical and optical conversion efficiency is 3.96, the repetition rate of pulse sequence in Q-switched envelope is 87 MHz, the pulse width of mode-locked pulse is 260 ps.3, the saturable absorber of tungsten disulfide is prepared. A Nd:GYSGG passively Q-switched and mode-locked laser based on it is designed. The results are as follows: when the pump power is 4 W, the output mirror is 15% and 27 respectively for the passive Q-switched operation. The shortest pulses are 620ns and 591ns, respectively, and the corresponding repeat frequencies are 67.35kHz and 70.7kHz. The optical and optical conversion efficiency are 9.2% and 7.5 respectively. When the pump power is 4 W, the maximum output power is 0.153 W, the optical-optical conversion efficiency is 3.22, the repetition rate of pulse sequence in Q-switched envelope is 78 MHz, the pulse width of mode-locked pulse is 307 ps.4, the saturable absorber of antimony telluride has been prepared. A passive mode-locked Nd:YVO4 laser based on it is designed. The experimental results show that the maximum output power is 0.119 W when the pump power is 2.3 W, the optical conversion efficiency is 3.79 and the repetition rate of pulse sequence in Q-switched envelope is 93.85 MHz, and the pulse width of mode-locked pulse is 925 PS.
【學(xué)位授予單位】：聊城大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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