【作者】 刘晔；

【导师】 李港； 陈檬；

【作者基本信息】 北京工业大学 ， 光学， 2000， 硕士

【摘要】 激光二极管泵浦的固体激光器（DPSL）及其有关的理论和技术是目前激光发展的一个重要方向。本论文紧密围绕DPSL的特性进行了一定的理论和实验研究。 在理论部分，首先从四能级系统的理论出发，得到了近阈值条件和强泵浦条件下的输出功率和斜效率的表达式，并详细讨论了泵光聚焦位置，泵浦光和振荡光的光斑大小、椭圆度等空间变量对输出特性的影响。针对实际常见的准三能级系统，首次得到了其输出特性的解析表达式，讨论了泵浦光和振荡光的光斑大小、晶体长度、输出镜透过率的影响，为实验的优化设计提供了理论根据。 在实验部分，首先采用两个连续LD通过准直、整形和聚焦后泵浦Nd：YAG激光介质，用KTP作倍频晶体，采用平凹腔的设计，得到了260mW的绿光输出，分别测定了在不同腔长下的输出功率，得到的结论是在长腔（L→R）或超短腔长时能得到较大的倍频输出，与理论分析吻合较好。另外，采用Nd：YVO₄为激光介质，测定了它的吸收光谱和偏振方向，用一个LD泵浦，分别采用面对面的直接紧贴泵浦技术和经过准直、整形、聚焦系统，得到了240mW和130mW的绿光输出。制成了可供实用的微型DPSL倍频激光器。更多还原

【Abstract】 The research of laser Diode(LD) pumped solid-state-laser(DPSL) and its relevant theory and technology is the currently main developing direction in the area of laser. This dissertation has made some theoretical and experimental study closely around the characteristics of DPSL.In the theory part, based on the rate-equation theory of four-level system, the expressions of output power and slope efficiency under the conditions of near-threshold and deeply pumping have been given. The effects of space distribution variables(the position of focusing point, dimension of pumping light and laser light and ellipticity)on the output characteristics were also discussed. As for the quasi-three-level system, the expressions of output power and slope efficiency were firstly conducted, and the effects of the dimension of pumping light and laser light, crystal length, and transmissivity of output mirror were investigated. These discussions provide a theoretical basis to the optimum design of LD endpumped laser.In the experiment part, two CW LD were used to pump the Nd:YAG laser material, and the KTP was used to be the frequency-doubled crystal. 260 mw green light output power was achieved. Output power of different cavity length was measured and accorded with theory. In addition, the Nd:YVO4 laser material was pumped by one CW LD, and its absorb spectrum was measured. Using direct-coupled pump and the optical couple system, we obtained 240 mw and 130 mw output power respectively. The practical miniature DPSL frequency-doubled laser was also manufactured.更多还原