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摘要: 在空心导管泵浦耦合系统中，测量了激光二极管叠阵中巴条的实际指向性，并带入仿真建模中，以便获得更准确、更优的模拟结果。与采用理想巴条指向性的模型模拟结果相比，耦合系统的耦合效率降低了11.2%。同时，带入实际指向性的模型模拟结果，具有更大的能量传输损耗和调制更深的泵浦光场分布，且该仿真模拟结果与实验结果相符。结果表明，在空心导管耦合系统设计中，带入实际巴条指向性模型是获得精确模拟结果的必要条件。Abstract: To get the best results in the simulation of designing a hollow-duct pump-coupling system, we measured the actual directivity of bars of laser diode arrays. Compared to the model with an ideal directivity of bars, the decrease in the coupling efficiency is as large as 11.2% in our model with the actual directivity of bars. A larger transmission loss and a worse intensity distribution of the pump field are got at the same time. The results of the simulation are well matched with that of the experiment. It is concluded that simulating with the actual directivity of bars is essential and more accurate.
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Key words:
- solid-state laser /
- pump coupling /
- laser diode array /
- hollow duct
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Figure 5. Intensity distribution of pump field of model with actual directivity of bars
Figure 6. Intensity distribution of pump field of model with ideal directivity of bars
Table 1. Parameters of LD module used in simulation
emitter size divergence angle in fast axis/(°) divergence angle in slow axis/(°) emitters per bar bars per stack stacks per module total power/kW uncollimated collimated 1(f*) μm×100 μm 40 0.5 7.5 61 34 3 20 *"f" means the fast axis direction 
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Table 2. Measured directivity of bars in LD module
mean angle offset/(°) max angle offset/(°) stack 1# -0.108 32 10.288 130 stack 2# -1.814 02 5.724 241 stack 3# -1.582 69 9.153 315
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