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就高功率激光二极管阵列端面抽运大口径放大器提出一种新的耦合方式：激光二极管阵列拟球面排布，其后紧接一个导管进行耦合传输. 用三维光线追迹法对这种耦合方式的特性进行模拟分析. 结果表明，该耦合方式能实现高的抽运耦合效率和高的能量沉积效率，在面积缩束比为30的条件下，该耦合方式的耦合效率和能量沉积效率最高可分别达96.7%，93.7%；当激光二极管面阵单元发光区域不小于导管输出端口径时，该耦合方式能实现抽运场均匀平顶分布；另外，采用该耦合方式，激光二极管阵列排列方式灵活，非对称排布时也可实现两维对称性好、均匀平顶分布的抽运耦合场输出. 建立了激光二极管阵列端面耦合实验系统，实现了85.4%的耦合效率和均匀的抽运耦合场输出.
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关键词:
- 激光二极管阵列抽运固体激光器 /
- 端面抽运 /
- 均匀抽运
A new coupling method is put forward for high power LDA end-pumped large-aperture amplifiers. The LDA is inscribed on a sphere and then a duct is added adjacent to it. Three-dimensional ray-tracing program is used to simulate the features of the new coupling method. Simulation results show that when the area contraction coefficient is about 30, deposition efficiency in the gain media as high as 93.7% can be achieved; When the emitting area is not less than the aperture of the duct, uniform and top-hat distribution is obtained. When several stacks are spliced to make an inscribing area, amplifiers with larger aperture can be end pumped. When stacks in LDA is placed as m×n(m≠n) arrays, uniform and top-hat distribution is also obtained. In the LDA coupling experiment, the output is top-hat distributed at the end of the duct and the coupling efficiency is 85.4%.-
Keywords:
- diode pumped solid-state lasers /
- end pumping /
- uniform pumping
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