【作者】 纪峰；

【导师】 姚建铨；

【作者基本信息】 天津大学 ， 物理电子学， 2007， 博士

【摘要】 随着周期极化晶体制作工艺的逐渐成熟,准相位匹配(QPM)技术以其特有的转换效率高的优点,在倍频、差频、光学参量振荡、光脉冲整型、光学滤波器、光学透镜、光偏转器以及全光开关、全光波长变换等许多领域获得了日益广泛的应用,逐渐成为非线性光学的研究热点。本文的主要内容和创新点可归纳如下:1、将周期极化晶体置于激光二极管(LD)端面泵浦的声光调Q Nd:YVO4激光器谐振腔内,进行了准相位匹配内腔光学参量产生(IOPG)的实验研究,获得了结构紧凑、低阈值、高转换效率的可调谐红外相干光源。2、深入研究了QPM技术在多波长频率变换方面的性质特点,设计出了一块双重调制周期极化晶体,进行了双信号光波运转的光学参量振荡(OPO)、光学参量产生(OPG)、内腔光学参量振荡(IOPO)以及内腔光学参量产生(IOPG)的实验研究,获得了间隔十几纳米的双信号光和间隔一百纳米左右的双闲频光输出。在OPO的实验中,采用不同透过率的输出耦合镜,在7.6W泵浦功率下分别获得了1.9W的双信号光和0.98W的双闲频光输出。在OPG的实验中,总共获得了570mW的双信号光和双闲频光输出,转换效率32.5%。在IOPO和IOPG的实验中,在6.1W LD泵浦功率下,分别获得了0.66W和0.44W的双信号光输出。3、对腔轴调谐的OPO进行了理论分析,并利用PPMgO:LN晶体进行了实验研究。4、理论上给出了非共线OPG实现宽带输出的模型。利用PPMgO:LN晶体,获得了1571~1679nm范围内的宽带输出。5、提出了一种利用倾斜周期极化晶体非共线光学参量振荡产生宽带光源的新方法。6、提出了一种利用非周期极化铌酸锂晶体电光效应实现双波长激光器调Q的新方案。以1.0643μm和1.3419μm双波长Nd:YVO4激光器为例,给出了设计方法。更多还原

【Abstract】 With the maturity of the fabrication of the periodically poled crystals, the quasi-phase matching (QPM) technique has gained more and more interests in the applications including frequency doubling, different frequency generation, optical parametric oscillation, optical pulse compression, optical filter, optical focus lens, optical deflector, all-optical switch and all-optical wavelength conversion. Now QPM has become a hotspot in nonlinear optics by the virtue of the extremely high conversion efficiency.The main content and key creation points of the dissertation are as follows:1. The QPM intracavity optical parametric generation (IOPG) based on periodically poled crystals internal to an acousto-optically Q-switched Nd:YVO4 laser pumped by a 808-nm diode laser(LD) was demonstrated. Thus a low-pump threshold, compact, high conversion efficiency infrared tunable coherent optical source was obtained.2. The multiple wave conversion based on QPM was investigated and a periodically-phase reversed PPMgO:LN crystal was designed. Optical parametric oscillation(OPO), optical parametric generation(OPG), intracavity optical parametric oscillation(IOPO) and IOPG based on this crystal was demonstrated. For the OPO, with different output coupling mirrors, the dual signal power of 1.9W and dual-idler power of 0.98W was obtained at an incident pump power of 7.6W. For the OPG, the total power of 570mW was achieved, leading to a conversion efficiency of 32.5%. For the IOPO and IOPG, the dual signal power of 0.66W and 0.44W was generated at a 6.1W LD pumping.3. The theoretical model of the axial angle tuned OPO was presented and the experiments based on the PPMgO:LN crystal was demonstrated.4. The theoretical model for generating broadband radiation by using a non-collinear OPG was presented. Using the PPMgO:LN crystal, the bandwidth of 1571~1679nm for the signal wave was achieved.5. A new method for generating broadband radiation by using a non-collinear QPM OPO based on the slant-stripe-type periodically poled crystal is proposed.6. A new approach by use of an electro-optic (EO) aperiodically poled lithium niobate (APLN) is proposed to realize Q-switch operation of the simultaneous dual-wavelength laser (SDWL). Taking the Nd:YVO4 laser at 1.0643μm and 1.3419μm for example, we present the design method of APLN based on simulated annealing algorithm(SA).更多还原