本文選題：LD泵浦 + 鎖模激光器��； 參考：《上海交通大學(xué)》2015年碩士論文

【摘要】：使用半導(dǎo)體激光二極管(LD)泵浦的全固態(tài)激光器,有著高效率、高穩(wěn)定性、結(jié)構(gòu)緊湊以及光束質(zhì)量好等優(yōu)點(diǎn),在科學(xué)研究、工業(yè)加工、激光醫(yī)療以及軍事探測打擊方面都有著廣泛的應(yīng)用,在現(xiàn)今的激光發(fā)展研究中是一個很重要的領(lǐng)域。尤其是高功率的超短脈沖鎖模激光器,在各個領(lǐng)域內(nèi)都有很重要的應(yīng)用,對各種不同激光晶體鎖模特性的研究成了激光研究中很重要的方面。本論文中,我們利用LD(陣列)進(jìn)行泵浦,針對可得到近紅外激光的兩種晶體,Nd:YVO4晶體和Yb:LuAG晶體的激光輸出性能進(jìn)行了研究。本文主要內(nèi)容可以分為五個部分:①全固態(tài)激光器以及全固態(tài)鎖模激光器的背景和發(fā)展現(xiàn)狀,包括第一章②鎖模技術(shù)的基本原理以及半導(dǎo)體飽和吸收鏡SESAM的原理,包括第二章③基于Yb:Lu AG晶體的雙波長鎖模激光器,包括第三章④LD泵浦高功率Nd:YVO4鎖模激光器的實(shí)驗研究,包括第四章⑤工作總結(jié)以及展望,包括第五章在第一部分,我們從激光器的發(fā)明開始,介紹了1960年以來全固態(tài)激光器的發(fā)展過程及現(xiàn)狀。主要介紹了固體激光器的泵浦方式從燈泵向半導(dǎo)體激光泵浦的轉(zhuǎn)變,以及在研究超快鎖模激光器的過程中各種不同鎖模技術(shù)的進(jìn)步變化。在第二部分,我們介紹了鎖模的基本原理,并對常用鎖模器件SESAM進(jìn)行了簡介。主要從公式上推導(dǎo)了鎖模技術(shù)為何能夠通過鎖定縱模相位來生成超短脈沖,并從SESAM的特性上分析了其如何在激光腔內(nèi)起到鎖模的作用。在第三部分,我們在實(shí)驗室中實(shí)現(xiàn)了Yb:LuAG激光器的波長脈寬可切換的鎖模運(yùn)轉(zhuǎn)。使用摻雜濃度10%,通光長度3mm的Yb:LuAG晶體,實(shí)現(xiàn)了波長以及脈寬可穩(wěn)定切換的鎖模激光輸出。通過對狹縫進(jìn)行調(diào)節(jié),激光器可以分別得到中心波長為1031nm,脈沖寬度1.15ps的皮秒脈沖輸出或中心波長1046nm,脈沖寬度252fs的的飛秒脈沖輸出,最高輸出功率達(dá)到2.2W。不同的皮秒或飛秒脈沖可以作為可切換泵浦源在泵浦OPO時產(chǎn)生重要作用。在第四部分,我們基于熱鍵合的Nd:YVO4激光晶體,在單諧振腔中獲得鎖模脈沖輸出,得到國內(nèi)最高的47.5W平均功率輸出。在該工作中,我們采用中心波長888nm的泵浦源以及熱鍵合Nd:YVO4晶體降低晶體工作時的熱負(fù)載。理論上,利用有限元軟件ANSYS分析了熱鍵合Nd:YVO4晶體在高功率泵浦下的溫度分布以及熱透鏡效應(yīng);實(shí)驗上,采用100W的光纖耦合888nm泵浦源,以及長度為(5+30+5)mm的熱鍵合YVO4-Nd:YVO4-YVO4晶體,在單諧振腔內(nèi)獲得了中心波長1064nm,最高平均功率47.5W的鎖模脈沖輸出。在第五部分,我們對本文涉及的工作做了總結(jié)與展望。在論文中,我們所研制的Yb:LuAG激光器具有高功率以及波長脈寬可切換等特點(diǎn),可以用作泵浦光學(xué)參量振蕩器來得到寬帶調(diào)諧的中紅外脈沖;Nd:YVO4振蕩器有著國內(nèi)最高的平均功率輸出,由于其皮秒高功率的特點(diǎn),可以在工業(yè)上應(yīng)用于硅片冷加工等,此外,在實(shí)驗室中也可以泵浦光學(xué)參量振蕩器嘗試得到10W量級的脈沖,這些應(yīng)用也會是我們將來的研究方向。
[Abstract]:All solid-state laser pumped by semiconductor laser diode (LD) has many advantages, such as high efficiency, high stability, compact structure and good beam quality. It is widely used in scientific research, industrial processing, laser medical treatment and military detection attack. It is a very important field in the current research of laser development. It is a high power ultrashort pulse mode locked laser, which is very important in all fields. The study of the mode locking characteristics of various different laser crystals has become an important aspect of laser research. In this paper, we use LD (array) to pump two kinds of crystals, Nd:YVO4 crystals and Yb:LuAG crystals that can be obtained by near red laser. The laser output performance is studied. The main contents of this paper can be divided into five parts: (1) the background and development status of all solid state laser and all solid state mode locked laser, including the basic principle of the first chapter, and the principle of the semiconductor saturable absorption mirror SESAM, including second chapters (3) the dual wavelength lock based on the AG crystal. The mode laser, including the experimental research of third chapter 4 LD pumped high power Nd:YVO4 mode locked lasers, includes fourth chapters 5 work summing up and prospect, including the fifth chapter in the first part. From the beginning of the laser, we introduce the development and status of the solid-state laser since 1960. It mainly introduces the pump of solid state laser. In the second part, we introduce the basic principle of the mode locking, and introduce the common mode locking device SESAM. The main reason is to deduce the reason that the mode locking technology can be locked through the lock. The longitudinal mode phase is used to generate the ultrashort pulse, and the function of how to lock the mode in the laser cavity is analyzed from the characteristics of SESAM. In the third part, we have realized the switching mode operation of the wavelength pulse width of the Yb:LuAG laser in the laboratory. The wavelength and the pulse width can be realized by using the Yb:LuAG crystal with the doping concentration of 3mm and the light length of the laser. A stable switched mode locked laser output. By adjusting the slit, the laser can obtain a picosecond pulse output of a central wavelength of 1031nm, a pulse width of 1.15ps or a central wavelength of 1046nm, a pulse width of 252fs, and the highest output power of a picosecond or femtosecond pulse with a different 2.2W. as a switchable pump. The Pu source plays an important role in pumping OPO. In the fourth part, we obtain the mode-locked pulse output in a single resonator based on the Nd:YVO4 laser crystal with hot bonding, and get the highest average power output of the domestic 47.5W. In this work, we use the central wavelength 888nm pump source and the hot bonding Nd:YVO4 crystal to reduce the crystal working time. Thermal load. In theory, the temperature distribution and thermal lens effect of hot bonding Nd:YVO4 crystal under high power pump are analyzed by the finite element software ANSYS. In the experiment, the central wavelength 1064nm in the single resonant cavity is obtained by using 100W optical fiber coupled 888nm pump source and the hot bonding YVO4-Nd:YVO4-YVO4 crystal with a length of (5+30+5) mm. In the fifth part, we have made a summary and Prospect of the work involved in this paper. In this paper, the Yb:LuAG laser we developed has the characteristics of high power and wavelength switching, which can be used as a pump optical parametric oscillator to obtain the wide-band tunable medium infrared pulse; Nd:YVO4 oscillation. The device has the highest average power output in China. Because of its high picosecond power, it can be used in silicon cold processing industry in industry. In addition, it can also pump optical parametric oscillator in the laboratory to get 10W order of pulse. These applications will also be our future research direction.

【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 趙智剛;董延濤;潘孫強(qiáng);劉崇;項震;陳軍;;50W量級雙端抽運(yùn)Nd∶YVO_4基模固體激光振蕩器[J];中國激光;2011年09期

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本文編號：1864297