發(fā)布時間：2018-01-27 04:27

  本文關(guān)鍵詞： Yb:NaY(WO4)2晶體 調(diào)Q 調(diào)Q鎖模 二硫化鉬 SESAM　出處：《濟南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著高亮度、高功率的In Ga As激光二極管的快速發(fā)展,很多研究人員的研究興趣逐漸集中到適用于產(chǎn)生超短強激光脈沖的摻鐿(Yb3+)激光晶體上。以摻Y(jié)b3+激光晶體作為激光介質(zhì)的全固化高功率超快激光器因其光轉(zhuǎn)換效率高、性能可靠、噪聲特性好、頻率穩(wěn)定、輸出功率高、集成化、小型化等優(yōu)勢,被廣泛的應(yīng)用于工業(yè)切割、激光武器、激光通信以及科學(xué)研究等各個領(lǐng)域。本論文主要對Yb:Na Y(WO4)2晶體的激光特性進行系統(tǒng)全面的研究,采用光纖耦合的半導(dǎo)體激光器作為抽運源,以摻Y(jié)b3+的鎢酸釔鈉激光晶體為增益介質(zhì),研究了Yb:Na Y(WO4)2激光器的連續(xù)、調(diào)Q、腔倒空、調(diào)Q鎖模、連續(xù)鎖模等多種方式的激光特性。主要研究內(nèi)容如下:1.首先介紹了固體激光器的優(yōu)點與應(yīng)用,然后概述了Yb3+和摻Y(jié)b3+激光晶體的特性和優(yōu)點,并綜述了摻鐿(Yb3+)的固體激光器的研究現(xiàn)狀和進展。2.對Yb:Na Y(WO4)2晶體的晶體結(jié)構(gòu)和連續(xù)激光特性進行了系統(tǒng)研究:首先分析了Yb:Na Y(WO4)2晶體的晶體特性和研究進展,然后簡單介紹了Yb:Na Y(WO4)2晶體生長方法,最后研究了LD抽運的Yb:Na Y(WO4)2晶體在1μm波段的激光特性,分析了連續(xù)激光輸出時的功率和光譜特性。當(dāng)連續(xù)運轉(zhuǎn)的最大抽運功率為6.23W、輸出鏡透過率為5%時,Yb:Na Y(WO4)2激光器輸出的最大功率為1.1W,光光轉(zhuǎn)換效率為17.7%,斜效率為34.5%,輸出光束為線偏振光。透過率為1%和5%時,激光波長分別分布在1044-1052nm和1054-1062nm之間。3.研究了不同調(diào)制器件對LD抽運的Yb:Na Y(WO4)2晶體的調(diào)Q激光輸出脈沖寬度和輸出功率的影響。將聲光調(diào)制器插入到LD抽運的Yb:Na Y(WO4)2激光器中,實現(xiàn)穩(wěn)定的聲光調(diào)Q激光運轉(zhuǎn),實驗中得到在重復(fù)率為10k Hz、抽運功率為8.6W時,激光器的平均輸出功率為180m W,脈沖寬度為398ns,計算得到單脈沖能量為18μJ,峰值功率為0.044k W;利用RTP電光調(diào)制器實現(xiàn)了Yb:Na Y(WO4)2晶體的電光腔倒空激光運轉(zhuǎn),獲得最大平均輸出功率為42.1m W,脈沖寬度隨抽運功率和重復(fù)頻率的增大幾乎沒有改變,脈寬穩(wěn)定在5.3±0.4ns;制備了Mo S2可飽和吸收體,并實現(xiàn)了Yb:Na Y(WO4)2調(diào)Q激光運轉(zhuǎn),當(dāng)抽運功率為10.37W時,得到70m W的平均輸出功率,測得脈沖寬度為426ns,重復(fù)頻率為135k Hz,計算出單脈沖能量和峰值功率分別為0.52μJ和1.2W。4.采用Z型折疊腔,用Yb:Na Y(WO4)2作激光晶體,聲光開關(guān)作為調(diào)制器件,實現(xiàn)了LD泵浦Yb:Na Y(WO4)2聲光調(diào)Q鎖模激光運轉(zhuǎn)。在泵浦功率為8.6W時,最大平均輸出功率為203m W,斜效率為6.5%。5.通過優(yōu)化設(shè)計諧振腔,研究了LD抽運Yb:Na Y(WO4)2晶體的SESAM連續(xù)鎖模激光特性:利用透射式SESAM作為鎖模器件,實現(xiàn)了Yb:Na Y(WO4)2晶體的鎖模激光運轉(zhuǎn),在泵浦功率為8.6W時,得到164m W鎖模脈沖輸出,脈沖寬度為246fs,重復(fù)頻率為35MHz,單脈沖能量為4.7n J,峰值功率為19.1k W;利用反射式SESAM作為鎖模器件,采用W型腔,實現(xiàn)了Yb:Na Y(WO4)2晶體的鎖模激光運轉(zhuǎn),在泵浦功率為7.83W時,平均輸出功率780m W,脈沖寬度為524fs,重復(fù)頻率為92.5MHz,單脈沖能量為8.4n J,峰值功率為16k W。
[Abstract]:In recent years, with the rapid development of In Ga with high brightness, high power As laser diode, the research interest of many researchers began to focus for producing doped ultrashort laser pulses (Yb3+) laser crystal. The Yb3+ doped laser crystal as laser medium solidified because of its high power ultrafast laser light conversion high efficiency, reliable performance, good noise characteristics, stable frequency, high output power, integration, miniaturization and other advantages, is widely used in industrial cutting, laser weapons, laser communication and various fields of scientific research. This paper mainly focuses on the theory of Yb:Na Y (WO4) are studied. 2 laser properties of crystals the use of fiber coupled semiconductor laser as pumping source with sodium yttrium tungstate laser crystal doped with Yb3+ as the gain medium of Yb:Na Y (WO4) continuous, adjustable Q 2 laser, cavity dumping, Q switched mode-locked, many continuous locking The characteristics of laser mode. The main contents are as follows: 1. firstly introduces the advantages and application of solid state lasers, and then summarizes the characteristics and advantages of Yb3+ and Yb3+ doped laser crystal, and summarized the Yb (Yb3+) solid laser research and development of.2. Yb:Na Y (WO4) 2 crystal and crystal structure continuous laser characteristics were studied: the first analysis of the Yb:Na Y (WO4) 2 crystal crystal properties and research progress, and then introduced the Yb:Na Y (WO4) 2 crystal growth method, finally the LD pumped Yb:Na Y (WO4) 2 crystal in the laser characteristics of 1 m wavelength, analysis power and spectral characteristics of CW laser output. When the maximum pump power of 6.23W continuous operation of the output mirror transmittance is 5%, Yb:Na Y (WO4) maximum power output is 2 1.1W, the optical conversion efficiency is 17.7%. The slope efficiency is 34.5%, the output beam is linearly polarized Through the rate of 1% and 5%, respectively. The distribution of laser wavelength between 1044-1052nm and 1054-1062nm.3. of different modulation devices of LD pumped Yb:Na Y (WO4) Q laser pulse output of 2 crystal width and output power. The acousto-optic modulator is inserted into the LD pumped Yb:Na Y (WO4) 2 laser, acousto-optic Q laser to achieve stable operation, obtained at 10K repetition rate in the Hz experiment, the pump power is 8.6W, the average output power is 180m W, pulse width of 398ns, calculated by the single pulse energy is 18 J, the peak power is 0.044k W; implementation of Yb:Na using Y RTP electro-optic modulator (WO4) 2 Crystal electro-optical cavity dumped laser operation, the maximum average output power is 42.1m W, the pulse width increases with the pump power and repetition frequency almost did not change in the stable pulse width of 5.3 + 0.4ns; preparation of Mo S2 saturable absorber, and realized Yb:Na Y (WO4) 2 Q laser operation, when the pump power is 10.37W, the average output power of 70m W is obtained. The measured pulse width 426ns, repetition frequency of 135k Hz, calculate the single pulse energy and peak power of 0.52 J and 1.2W.4. using Z Yb:Na Y type folded cavity. (WO4) 2 laser crystal, acousto-optic switch as a modulation device, to achieve the LD pumped Yb:Na Y (WO4) 2 acousto-optic mode-locked Q laser operation. When the pump power of 8.6W, the maximum average output power is 203m W, the slope efficiency is 6.5%.5. by optimizing the design of resonant cavity of LD pumped Yb: Na Y (WO4) 2 crystal SESAM CW mode-locked laser characteristics: the use of SESAM as the transmission mode locking device, the Yb:Na Y (WO4) 2 Crystal mode-locked laser operation, when the pump power of 8.6W, 164M W mode-locked pulse output, pulse width 246fs, repetition frequency of 35MHz, single the pulse energy is 4.7n J, peak power 19.1k W; the use of reflective SESAM as mode locking device, using W cavity, implementation of the Yb:Na Y (WO4) 2 Crystal mode-locked laser operation, when the pump power of 7.83W, the average output power of 780m W, pulse width 524fs, repetition frequency of 92.5MHz, single pulse energy of 8.4n J peak the power is 16K W.

【學(xué)位授予單位】：濟南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN24

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