【摘要】：激光二極管(LD)泵浦板條固體激光器具有結(jié)構(gòu)簡(jiǎn)單,性能穩(wěn)定,泵浦轉(zhuǎn)換效率高,能夠獲得峰值功率高,脈沖寬度窄的激光輸出,已經(jīng)在國(guó)防工業(yè)、激光通信、雷達(dá)探測(cè)、醫(yī)療器械、工業(yè)生產(chǎn)和信息處理等方面取得了廣泛的應(yīng)用。論文綜述了板條激光器的國(guó)內(nèi)外研究現(xiàn)狀及典型的泵浦結(jié)構(gòu),介紹了Nd:YAG晶體的特性、諧振腔理論和被動(dòng)調(diào)Q理論,闡述了板條激光器的廢熱產(chǎn)生機(jī)理,采用ANSYS有限元分析軟件計(jì)算模擬了LD泵浦情況下板條激光晶體內(nèi)部的溫度場(chǎng)分布。采用脈沖LD陣列側(cè)面泵浦方式,研究了輸出鏡透過率、泵浦頻率和泵浦脈沖寬度對(duì)板條激光器寬脈沖輸出的影響;通過在脈沖激光器腔內(nèi)置入不同小信號(hào)透過率的Cr4+:YAG晶體實(shí)現(xiàn)被動(dòng)調(diào)Q輸出,研究了泵浦能量、輸出鏡透過率、泵浦脈沖寬度對(duì)被動(dòng)調(diào)Q輸出特性的影響,深入探討了不同泵浦強(qiáng)度情況下的被動(dòng)調(diào)Q輸出脈沖特性。在輸出鏡透過率為20%、泵浦頻率為30Hz、泵浦脈沖寬度為300μs、泵浦電流為200A時(shí),獲得了寬脈沖脈沖能量為89.1mJ的激光輸出。經(jīng)過被動(dòng)調(diào)Q后獲得單脈沖能量為5.25mJ,脈沖寬度為38ns,峰值功率達(dá)到1.382kW。
[Abstract]:Laser diode (LD) pumped lath solid-state laser has the advantages of simple structure, stable performance, high pump conversion efficiency, high peak power and narrow pulse width. It has been used in national defense industry, laser communication and radar detection. Medical devices, industrial production and information processing have been widely used. In this paper, the research status and typical pump structure of lath laser at home and abroad are reviewed, the characteristics of Nd:YAG crystal, cavity theory and passive Q-switching theory are introduced, and the mechanism of waste heat generation of lath laser is described. The temperature field distribution in lath laser crystal pumped by LD is calculated and simulated by ANSYS finite element analysis software. The effects of output mirror transmittance, pump frequency and pump pulse width on the wide pulse output of lath laser are studied by using pulse LD array side pumping mode. The passive Q-switched output is realized by inserting Cr4: YAG crystal with different small signal transmittance into the cavity of pulse laser. The effects of pump energy, transmission rate of output mirror and pump pulse width on the output characteristics of passive Q-switching are studied. The characteristics of passively Q-switched output pulse under different pump intensities are discussed in detail. When the transmittance of the output mirror is 20%, the pump frequency is 30Hz, the pump pulse width is 300 渭 s and the pump current is 200A, the laser output with wide pulse energy of 89.1mJ is obtained. After passively Q-switching, the monopulse energy is 5.25mJ, the pulse width is 38Ns, and the peak power is 1.382kW.
【學(xué)位授予單位】：長(zhǎng)春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN248

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