激光二极管抽运固体激光器场分布的热不稳定性研究  

Heat-induced undulation in the distribution of diode-pumped solid-state laser

作　　者：王石语[1] 过振[2] 傅君眉[1] 蔡德芳[2] 文建国[2] 薛海中[2] 唐映德[2] 

机构地区：[1]西安交通大学微波所,西安710049 [2]西安电子科技大学技术物理学院,西安710071

出　　处：《物理学报》2003年第2期355-361,共7页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :60 0 780 2 2 );国家重点实验室基金 (批准号 :5 14 3 80 10 2 0 1DZ0 10 2 )资助的课题 ~~

摘　　要：通过建立激光介质非热平衡状态的振荡散热模型 ,分析了激光二极管抽运固体激光器中 ,热透镜的不稳定性 .研究表明 ,热透镜的这种热不稳定性是造成激光场不稳定的重要因素 .会造成高斯半径的不稳定波动 ,会使激光光束的指向角波动 ,会造成激光光斑的非对称畸变 ,这种畸变也处于波动之中 .通过对端面抽运条件下 ,热耗为 1W的Nd :YAG激光介质的理论和实验研究 ,确定了这种原因下光场不稳定度的数量级 .A theoretical model has been adopted to analysis the unsteady thermal effects in a laser medium. It is based on the fact that the internal dissipation power is always unequal to the heat removed from the surface. According to this, the case in a laser diode pumped solid state laser has been studied. The result obtained shows that the fluctuations in the laser beam strongly depend on those of the temperature in the heat sink. It was also shown that the dissymmetric temperature distribution of the heat sink distorts the shape of the laser beam. A set of experiments has been carefully designed to proved these conclusions.

关 键 词：激光二级管抽运 热不稳定性 固体激光器 热透镜 光场分布 振荡散射模型 

分 类 号：TN248.4[电子电信—物理电子学]