为了进一步提高相干偏振合成的效率, 采用数值模拟方式, 对偏振误差的影响及系统的拓展性进行了分析, 并计算了偏振误差在3种不同拓展结构下对相干偏振合成效率的影响。当偏振合束器的透过率和反射率分别是96%和99.5%、半波片的透过率是99.7%时, Y型结构16路光束的整体合成效率会在偏振误差增大到0.03rad时下降0.33%; 随着合成路数的增大, 合成效率逐渐降低, 当光束拓展至128路时, Y型结构的合成效率将下降至83%。结果表明, 光功率相对平衡的Y型结构具有最高的合成效率, 同时受偏振误差的影响最小。该研究确定了系统的最佳合成方案, 为基于相干偏振合成的效率分析提供了参考。

To further improve combining efficiency of polarized beam combination, effect of polarization error and systematical extensibility were analyzed byusing numerical simulation method. The influence of polarization error on combining efficiency of coherent polarization beams was calculated under three kinds of different expanded structures. The overall combining efficiency of 16 path beamswith Y structure decreases 0.33%when the transmittance of polarization beam combiner(PBC) and the reflectance of PBC are 96% and 99.5% respectively, the transmittance of the half wave-plate is 99.7% and polarization error is 0.03rad. The combining efficiency declines gradually with the increase of beam number.The combining efficiency of 128 beams with Y structure drops to 83%. The results show that, Y structure with the relative balance of light power has the highest combining efficiency, and has the least influence by the polarization error.This study determines the optimal combining scheme of the system and provides a reference for the efficiency analysis based on coherent polarization combination.