二极管泵浦Nd:YAG薄片激光器技术研究
Study on diode-pumped Nd:YAG disk laser
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摘要: 固体激光器向高平均功率发展的最大障碍是激光介质的热效应。采用薄片激光介质可以实现热流近一维分布，因而是解决固体激光器热效应的有效手段之一，但许多因素都会影响薄片的一维热分布。对薄片热分布的主要影响因素进行的计算分析表明，在均匀泵浦条件下，泵浦区径向温度的均匀性不仅和泵浦区面积与薄片厚度之比有关，而且和冷却区与泵浦区的相关尺寸有关。采用均匀耦合技术并合理设计薄片的散热冷却结构以实现热流近一维分布，用平均功率336 W的激光二极管阵列泵浦一块Nd:YAG薄片，获得了平均功率超过120 W的准连续激光输出。Abstract: Thermal effects present a major challenge to scaling of solid-state laser to high-average power. When using a thin laser crystal disc with a nearly flat top pump profile, the heat flux can be considered to be one-dimensional. This results in a homogeneous temperature and stress profile within the laser medium leading to dramatically reduce the thermal effects. Some factors that may affect the homogeneous temperature profile are analyzed, such as the cooling dimension and the ratio of the pump area to the thickness of the disc. More than 120 W of an average output power is obtained with a 336 W average pump power by using a good design.
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Key words:
- diode-pumped /
- disk laser /
- high power /
- homogeneous temperature profile
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