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为研制高功率的板条功率放大模块,对Nd∶YAG板条激光器的增益介质的热结构进行了研究。采用有限元方法仿真了高功率激光二极管阵列端面抽运Nd∶YAG板条介质的温度、应力分布,数值模型考虑了抽运光在介质内的不均匀分布。结果表明,板条介质掺杂和未掺杂结合部位温度和应力最高,是整个板条介质的薄弱环节,应优化设计避免板条破裂。以此为参考设计高功率放大模块,而后搭建激光放大链路,种子光功率2.5 W,通过一级预放模块四程放大后,再经过四级功放模块双程放大,实现了11 kW激光输出。实验中测量了高功率抽运条件下增益介质的温度分布,与数值仿真结果基本符合。
In order to develop a high-power slab power amplifier module, the thermal structure of the gain medium of the Nd: YAG slab laser has been studied. The finite element method was used to simulate the temperature and stress distribution of Nd:YAG slab media in end-pumped laser diode array. The numerical model considered the non-uniform distribution of pumping light in the media. The results show that the temperature and the stress of the slab media doped and undoped are the weakest points in the entire slat media. The slab should be optimized to avoid the slab rupture. As a reference design high power amplifier module, and then build a laser amplification link, the seed optical power 2.5 W, through a four-stage pre-amplifier module amplification, and then through four amplifier module two-way amplification, to achieve a 11 kW laser output . In the experiment, the temperature distribution of the gain medium under high power pumping conditions was measured, which is in good agreement with the numerical simulation results.