本文選題：Nd:CNGS晶體 + 短脈沖　； 參考：《山東大學》2017年碩士論文

【摘要】：全固態(tài)短脈沖激光器以其結構簡單、穩(wěn)定性好、使用壽命長、光束質量高、效率高、熱效應小等優(yōu)勢,在工業(yè)、軍事、醫(yī)療等多個領域都有很重要的應用。全固態(tài)脈沖激光器的發(fā)展很大程度上得益于固體激光增益介質的探索與拓展。目前使用最廣泛的激光增益介質是摻雜激活離子晶體,其中以Nd3+離子摻雜晶體的研究與應用最為廣泛,Nd:YAG、Nd:YVO4、Nd:YLF、Nd:YAP等晶體為代表的激光增益介質已有大量的研究和應用。但是近年來,隨著各行各業(yè)對激光器件的要求越來越高,探索新的激光晶體及其特性就成為人們不斷追求的方向和目標。1998年,俄羅斯研究者首次報道并詳細分析Ca3NbGa3Si2O14(CNGS)晶體的性能,證明它是一種性能優(yōu)良的壓電晶體。近年來,研究者針對CNGS晶體良好的熱學和光學性能,提出此類晶體有望成為一種新型激光晶體的基質材料。本重點實驗室郭世義老師課題組通過大量的調研和實驗探索,首次獲得一系列摻雜濃度不同的Nd:CNGS晶體。在此基礎上,我們課題組與郭世義教授課題組展開合作,對Nd:CNGS晶體的力學、熱學、光譜及多功能復合特性研究,并提出Nd:CNGS晶體在超短脈沖激光器件領域中存在一定的發(fā)展前景。因此,本論文主要工作是在前期Nd:CNGS晶體物理光學性質測試和連續(xù)波激光特性研究基礎上,開展Nd:CNGS晶體調Q和鎖模短脈沖激光器特性研究。主要研究工作包括:Ⅰ對調Q原理進行簡單介紹,分析了聲光調Q技術的基本理論;采用聲光Q開關,實現(xiàn)主動調Q Nd:CNGS晶體脈沖激光輸出;通過設置不同重復頻率,測量在不同泵浦功率下,相應的平均輸出功率和脈沖寬度,計算相應的峰值功率和單脈沖能量。其中,最窄脈沖寬度為13.8 ns,最大單脈沖能量為92.7μJ,最高峰值功率為6.3 kW。Ⅱ簡單介紹了 Cr:YAG、V:YAG晶體;以Cr:YAG晶體為可飽和吸收體為例,詳細分析了被動調Q的理論;并在實驗上得到Cr:YAG和V:YAG被動調Q Nd:CNGS晶體脈沖激光。最終,采用y切Nd:CNGS晶體得到最大平均輸出功率為0.59 W、脈寬為22.89 ns、重頻為11.7 kHz、最大單脈沖能量為50.43 μJ、最高峰值功率為2.20 kW的脈沖激光。Ⅲ對層狀黑磷可飽和吸收鏡的制備方法進行簡單介紹;采用少層黑磷作為調制元件,實現(xiàn)Nd:CNGS晶體1.3 μm被動調Q激光輸出,對應最窄脈寬0.99μs,最大單脈沖能量1.88 μJ。Ⅳ對鎖模原理進行了簡單分析,提出了抑制鎖模中經(jīng)常出現(xiàn)的調Q鎖模趨勢的解決方法;采用SESAM為調制元件,得到Nd:CNGS晶體1.0μm皮秒激光輸出,最短脈寬1.0 ps、中心波長1065 nm、重頻49.2 MHz、最大輸出功率115 mW、對應單脈沖能量2.33 nJ和峰值功率2.23 kW。Ⅴ對鎖模激光器中的色散補償進行簡單分析;并且對Nd:CNGS晶體皮秒脈沖激光腔內加入色散補償啁啾鏡對腔內的正色散進行補償,成功將鎖模脈寬壓縮至759 fs,最大輸出功率為133 mW、單脈沖能量和峰值功率為3.1 nJ和4.1 kW。實驗結果表明Nd:CNGS晶體對實現(xiàn)飛秒量級的超快激光很有優(yōu)勢。
[Abstract]:All solid-state short pulse laser has the advantages of simple structure, good stability, long service life, high quality of light beam, high efficiency and low thermal effect. It has very important applications in many fields, such as industry, military and medical treatment. The development of all solid state pulse laser is greatly beneficial to the exploration and expansion of solid laser gain medium. The most widely used laser gain medium is the doped activating ion crystal. The research and application of Nd3+ ion doped crystals is the most widely used. The laser gain media, such as Nd:YAG, Nd:YVO4, Nd:YLF and Nd:YAP, have been widely studied and applied. However, in recent years, the demand for laser devices is becoming higher and higher, and new exploration has been made. The laser crystal and its characteristics have become the direction and target of continuous pursuit in.1998 years. Russian researchers first reported and analyzed the performance of Ca3NbGa3Si2O14 (CNGS) crystal for the first time, and proved that it is a kind of piezoelectric crystal with excellent performance. In recent years, researchers have proposed such crystals in view of the good thermal and optical properties of CNGS crystals. As a matrix material for a new type of laser crystal, the research group of Guo Shiyi, the key laboratory, has obtained a series of Nd:CNGS crystals with different doping concentration through a lot of investigation and experimental exploration. On this basis, we cooperate with Professor Guo Shiyi to study the mechanics, heat, spectra and many of the Nd:CNGS crystals. It is suggested that Nd:CNGS crystals have some potential in the field of ultrashort pulse laser devices. Therefore, the main work of this thesis is to study the characteristics of Nd:CNGS crystal Q and mode locked short pulse lasers on the basis of the physical and optical properties of the early Nd:CNGS crystals and the study of the characteristics of the continuous wave laser. The research work includes: I briefly introduce the principle of Q modulation, analyze the basic theory of the sound and light modulation Q technology, and use the acoustooptic Q switch to realize the active modulation of Q Nd:CNGS crystal pulse laser output. By setting different repetition frequencies, the corresponding average output power and pulse width are measured at different pump power, and the corresponding peak power is calculated and the corresponding peak power is calculated. One pulse energy, of which the narrowest pulse width is 13.8 ns, the maximum single pulse energy is 92.7 mu J, the maximum peak power is 6.3 kW. II. The Cr:YAG, V:YAG crystal is briefly introduced. The theory of passive Q is analyzed in detail with Cr:YAG crystal as a saturable absorber, and Cr:YAG and V:YAG passive Q Nd:CNGS crystal pulse laser is obtained experimentally. Finally, the maximum average output power of the Nd:CNGS crystal is 0.59 W, the pulse width is 22.89 ns, the heavy frequency is 11.7 kHz, the maximum single pulse energy is 50.43 u J, the maximum peak power is 2.20 kW, and the preparation method of the layered black phosphorus saturable absorpable mirror is briefly introduced, and N is used as the modulation element to realize N. D:CNGS crystal 1.3 mu m passively modulated Q laser output, corresponding to the narrowest pulse width of 0.99 Mu s, and the maximum single pulse energy 1.88 mu J. IV, a simple analysis of the mode locking principle is carried out. A solution to restrain the tendency of modulating Q mode locked frequently in the mode lock is proposed. The SESAM is used as the modulation element to obtain the 1 mu m picosecond laser output of Nd: CNGS crystal, and the shortest pulse width is 1 ps. The central wavelength is 1065 nm, a heavy frequency 49.2 MHz and a maximum output power of 115 mW. A simple analysis is made for the dispersion compensation in a mode locked laser with a monopulse energy 2.33 nJ and a peak power 2.23 kW. v. And a dispersion compensation chirp is added to the cavity of a picosecond pulse laser to compensate the positive dispersion in the cavity. The maximum output power is 759 FS and the maximum output power is 133 mW. The experimental results of single pulse energy and peak power of 3.1 nJ and 4.1 kW. show that the Nd:CNGS crystal has a great advantage for the realization of the ultrafast laser at the magnitude of the femtosecond.

【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248

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