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Influence of beam shape on piston and tilt error in coherent combined laser array

机译：相干组合激光阵列中光束形状对活塞和倾斜误差的影响

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摘要

An analysis of beam combining quality and the influence of beam profile on tilt and piston error tolerances is presented. We define beam combining performance metrics in terms of powers contained within a specific radius. It is shown that the selection of this radius has a significant effect on the obtained tolerance values. We have taken the tolerance limit as a decrease in intensity of 20%, for piston and tilt error. In addition, for the tilt error, as tolerance limit, we have taken a pointing error equal to the diffraction limit. Our analysis demonstrates that the beam combining performance metric based on the diffraction-limited radius functions best for describing the impact of aberrations on the coherent combined laser array optical system. Our results lead to two important conclusions. First, the tilt error has a greater impact on the degradation of beam quality. Second, a Gaussian beam has greater tolerance for both errors than a top-hat beam.
机译：提出了光束组合质量的分析以及光束轮廓对倾斜和活塞误差公差的影响。我们根据特定半径内包含的功率来定义波束组合性能指标。结果表明，该半径的选择对获得的公差值有显着影响。对于活塞和倾斜误差，我们将公差极限视为强度降低20％。另外，对于倾斜误差，作为公差极限，我们采用等于衍射极限的指向误差。我们的分析表明，基于衍射极限半径的光束组合性能指标最能描述像差对相干组合激光阵列光学系统的影响。我们的结果得出两个重要结论。首先，倾斜误差对光束质量的下降影响更大。其次，高斯光束对两个误差的容忍度均高于礼帽光束。

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