【作者】 林浪；

【导师】 陈振强；

【作者基本信息】 暨南大学 ， 光学工程， 2008， 硕士

【摘要】 LD泵浦全固态激光器（DPSSL）与传统的灯泵激光器相比具有高效率、高光束质量、稳定性好、结构紧凑、长寿命等优点，已经而成为固体激光器的一个重要发展方向。目前，广泛应用于材料加工、医疗、军事、信息和基础研究等领域。本文在认真分析国内外对LD泵浦全固态红光激光器的研究发展现状基础上，针对几种激光晶体的性能和几种NLO晶体的非线性光学特点的组合的理论与实验研究，取得了如下成果：1、在Nd：GdVO₄、NdYVO₄晶体的物理和光学性质基础上，从四能级速率方程理论出发，分析了两种晶体激光器的工作阈值、激光模式匹配、输出功率、斜效率等激光参数。2、介绍了非线性频率变换理论及非线性光学晶体KTP、LBO和BIBO的物理光学性质。从折射率方程出发，利用MATLAB编程，对双轴晶体KTP、LBO与BIBO倍频与和频的相位匹配特性进行了理论分析及数值模拟，并对LBO和BIBO晶体的非线性极化张量进行了修正，计算了相位匹配曲线、有效非线性倍频与和频系数、离散角、允许角的空间分布，比较了它们的匹配相关参量。指出了倍频与和频时的最佳匹配方式：并给出其最佳相位匹配方向和有效非线性倍频与和频系数，所得的结果对倍频红光及三倍频447nm蓝光实验研究有重要的指导意义。3、分析了Nd：GdVO₄、NdYVO₄晶体在泵浦功率作用下的热透镜效应，根据等效热透镜理论，结合最优模式匹配和ABCD高斯光束传输矩阵，优化了谐振腔参数。4、通过理论分析及实验研究，获得了四种激光系统Nd：YVO₄／LBO、Nd：YVO₄／BIBO、Nd：GdVO₄／LBO和Nd：GdVO₄／BIBO的671nm和670nm稳定的连续的红光输出，功率分别为：67mW、54mW、57mW和38mW。对比发现只有Nd：YVO₄／LBO才是最有优势的，并分析了转换效率低的原因。更多还原

【Abstract】 Laser diode pumped all-solid-state laser has become an important developing direction in the field of solid-state laser technology. In comparison with the traditional flash-lamp pumped laser, it has many advantages such as high efficiency, high beam quality, good steadiness, compactness, long lifetime and so on. Presently, the laser diode pumped all-solid-state laser has been used widely in the fields of the material processing, medical, treatment military, information, fundamental research and so on.In this dissertation, the research progress and application foreground of LD pumped all-solid-state laser are earnestly analysed. Based on this analysis, the theoretical and experimental researches on all-solid-state 671nm red laser of between the several laser crystals and the several NLO crystals combined systems, are presented. The main achievements are as follows:1、The optical and physical characteristic of Nd:YVO₄、Nd: GdVO₄ is introduced. Then based on the velocity equation of four level system, we analysed the laser thethreshold, output power, slope efficiency, mode matching and so on.2、The nolinear optical frequency conversion theory and the optical or physical characteristic of LBO、KTP are introduced. Based on the refractive index equation of nolinear optical cystal, the phase-matching characteristics of the frequency-doubling and sum-frequency mixing is numerically calculated and theoretically analyzed in the biaxial crystals KTP, LBO and BIBO. The nonlinear optical coefficients tensor of the sum-frequency generation is modified in the optical coordinates system. The phase-matching curve and spatial distribution of the effective nonlinear coefficient, walk-off angle and acceptance angle are performed. Compared to one another, their optimal phase-matching orientation and the corresponding effective nonlinear coefficient are given. The result of calculations is very important for the experimental research on frequency doubling 671nm laser and sum-frequency mixing 447nm laser.3、The optimization resonant parameters were obtained by analyzing the thermal focal lens of the Nd:YVO₄ and Nd:GdVO₄ laser crystals and using the standard ABCD ray propagation matrix and optimun mode matching. By systematically theoretical analysis and experimental research, stable continuous-wave output 671nm red laser had obtained in the four systems of the Nd:YVO₄/LBO, Nd:YVO₄/BIBO, Nd:GdVO₄/LBO and Nd:GdVO₄/BIBO. The corresponding maximal output powers are 67mW, 54mW, 57mW and 38mW, respectively. Compared to one another, the system of Nd:YVO₄/LBO is outstanding. And their lower optical-optical conversion efficiency is analysed.更多还原