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  本文關(guān)鍵詞： Yb:YAG 吸收效率 24沖程 平凹腔 焊接　出處：《長春理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著半導(dǎo)體二極管泵浦激光器技術(shù)的不斷發(fā)展和提高,LD泵浦的高功率Yb:YAG全固體碟片激光器因其具有優(yōu)等的光學(xué)、化學(xué)、熱力穩(wěn)定性和機(jī)械性而得到廣泛的關(guān)注。本文則做了以下幾個(gè)方面的研究。(1)本文首先理論研究了Yb:YAG晶體的吸收效率和摻雜濃度、厚度之間的關(guān)系,并且用Lamda950分光光度計(jì)測(cè)量了晶體摻雜濃度為10%,厚度為0.3mm的吸收系數(shù),驗(yàn)證了理論和模擬計(jì)算的一致性。最后通過測(cè)量得到的吸收系數(shù),用Matlab模擬計(jì)算了在24沖程泵浦下晶體摻雜濃度為10%,厚度為0.3mm的吸收效率為96.4%(R=99.5%)。同時(shí)還對(duì)比分析了在不同泵浦功率下,969nm零聲子線泵浦和940nm泵浦在晶體表面的溫度差異。(2)通過Zemax軟件設(shè)計(jì)了24沖程的泵浦結(jié)構(gòu),并通過閾值功率密度公式計(jì)算了7倍泵浦閾值功率密度時(shí),泵浦光斑的大小為2.4mm。最后利用Zemax優(yōu)化仿真得到當(dāng)泵浦光斑為2mm時(shí)為最適宜。(3)利用Matlab軟件分析了碟片激光器的直腔,最后分析得到在180W泵浦時(shí)由于晶體表面會(huì)產(chǎn)生形變,但是只要晶體曲率半徑的形變量是腔長的2倍之上,整個(gè)激光器就是穩(wěn)定的。通過比較最后選用腔長為L=105mm、R2=840mm的平凹腔,實(shí)現(xiàn)了36.21%的連續(xù)光輸出;占空比為12.5%時(shí),實(shí)現(xiàn)了61.3%的光光效率。(4)利用Lamda950分光光度計(jì)、美國zygo干涉儀和AFM分別測(cè)量了晶體、非球面和棱鏡的透過率、表面面型和膜層的微觀結(jié)構(gòu)。最后分析得到各個(gè)模塊的反射率都能夠達(dá)到R=99.7%,面型都能夠保持在1/8?之下,并且利用ANSYS軟件模擬了晶體在180W泵浦時(shí)前后表面的溫差,合理的設(shè)計(jì)了微通道的冷卻系統(tǒng)、晶體和銅鎢的焊接工藝。
[Abstract]:With the development of semiconductor diode pumped laser technology and the improvement of LD-pumped high power Yb:YAG all-solid-state disc laser, because of its excellent optical and chemical properties, Thermal stability and mechanical properties have attracted wide attention. In this paper, the following aspects have been studied. Firstly, the relationship between absorption efficiency and doping concentration and thickness of Yb:YAG crystals has been studied theoretically. The absorption coefficient of the crystal with doping concentration of 10 mm and thickness of 0.3 mm is measured by Lamda950 spectrophotometer, which verifies the agreement between the theory and the simulation calculation. The absorption efficiency of crystal doped with doping concentration of 10 and thickness of 0.3 mm under 24 stroke pumping was calculated by Matlab. The temperature difference of 969 nm zero phonon line pumping and 940 nm pump on the crystal surface was also compared and analyzed. The pump structure of 24 stroke is designed by Zemax software. With the formula of threshold power density, the size of pump spot is 2.4 mm when the power density of 7 times pump threshold is calculated. Finally, when the pump spot is 2 mm, the optimum value of pump spot is obtained by using Zemax. Finally, the straight cavity of disc laser is analyzed by Matlab software. Finally, it is found that the crystal surface will deform at 180W pump, but the whole laser is stable as long as the shape variable of the curvature radius of the crystal is more than 2 times the length of the cavity. The continuous light output of 36.21% is realized, the optical efficiency of 61.3% is realized when the duty cycle is 12.5) the transmittance of crystal, aspherical surface and prism are measured by zygo interferometer and AFM using Lamda950 spectrophotometer. Finally, the reflectivity of each module can reach R ~ (99. 7), and the surface shape can be kept at 1 / 8? The temperature difference between the front and back surfaces of the crystal pumped at 180W was simulated by using ANSYS software. The cooling system of the microchannel and the welding technology of crystal and copper tungsten were designed reasonably.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248

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本文編號(hào)：1545919