导　　师： 阮双琛;苏红

学科专业： 0803

授予学位： 博士

作　　者： ;

机构地区： 华中科技大学

摘　　要： 光参量振荡器是产生宽带连续可调谐的中红外激光的一种非常重要的手段，它能够将一个泵浦激光转换为相干输出的信号光和闲频光，且可以在较宽的频率范围内实现连续可调谐输出。另外，光参量振荡器除了可以实现小型化与全固化外，还具备了转换效率高、结构简单、工作可靠度高等优点。近些年来，随着一批新的优质非线性光学晶体的发明，尤其是掺氧化镁的周期极化铌酸锂晶体/(MgO：PPLN/)的出现，以及非线性频率变换和宽带连续可调谐激光技术的迅速发展，使得光参量振荡器这一研究领域取得了很多重要的成果。这也使得光参量振荡器在很多领域得到了广泛的应用，如相干反斯托克斯拉曼散射/(CARS/)谱测量、激光光谱学研究、环境监测、遥感、材料处理、激光测距、红外干扰和对抗等。光参量振荡器及其应用技术研究的发展在现代科技发展中将起着越来越重要的作用，因此它的研究前景将十分看好。 作者进行了基于PPLN晶体和MgO：PPLN晶体的准相位匹配/(QPM/)宽带连续可调谐的中红外光参量振荡器的理论与实验研究工作；同时也对光参量产生器作了相关的实验研究。主要工作如下： /(1/)对国内外有关宽带连续可调谐的中红外光参量振荡器的研究现状以及发展趋势做了广泛的调研工作，且以此明确了自己研究工作的重点和方向。 /(2/)分析了与宽带连续可调谐中红外光参量振荡器相关的一些基础理论，具体如光参量振荡器和产生器中的三波互作用理论、准相位匹配理论、光参量振荡器的基本理论等。尤其对光参量振荡器的增益、阈值、转换效率等特性进行了系统地分析。并且简要介绍了如何设计基于PPLN晶体和MgO：PPLN晶体的光参量振荡器。 /(3/)报道了宽带连续可调谐的中红外单谐振PPLN-OPO的研究工作。泵浦源为 Optical parametric oscillator /(OPO/) is one of the most important ways to get widelycontinuous-tunable mid-infrared lasers. The pump light could be converted into signal lightand idler light by this way. Meanwhile, it can generate widely tunable coherent light.Furthermore, the OPO possess the characteristics of high efficiency, simple structure, andhigh work stabilization and it could be made in small and all-solid. In recent years, with theinvention of the new nonlinear crystals, especially the invention of the periodically poledMgO-doped lithium niobate /(MgO:PPLN/) crystal, and the rapid development of thenonlinear frequency transformation and the technologies for the tunable laser, lots ofimportant breakthroughs have been made in the field of OPO. The OPO has been used inmany fields, such as CARS, laser spectroscopy, environmental monitoring, remote sensing,material handling, laser ranging, infrared interference and countermeasure. Therefore, theresearch on the OPO and its applications will become more and more important for thedevelopment of the modern science and technology. The perspective of the studies on OPOis bright. The author has done some theoretical and experimental research work onquasi-phase-matched /(QPM/) widely continuous-tunable mid-infrared OPO which is basedon PPLN crystal and MgO:PPLN crystal. Meanwhile, some experimental research work onoptical parametric generator /(OPG/) has been done, too. The main research works aresummarized as follows: /(1/) The worldwide research status at present and the developing trend in the future ofthe widely continuous-tunable mid-infrared OPO have been studied and investigated.Therefore, the important points and the direction of our own research work are clear. /(2/) The interrelated basic theories of the widely continuous-tunable mid-infrared OPOhave been analyzed and discussed. Such as the three wave interaction in the OPO or OPG,QPM theory, and the basic theory of the OPO. Furthermore, the gain, threshold value, andconversion efficiency o

关 键 词： 中红外激光 非线性频率变换 光参量振荡器 光参量产生器 准相位匹配 周期极化铌酸锂晶体

领　　域： [电子电信]