Jung Aeri, Song Sanggwon, Kim Seokjin, Oh Kyunghwan
Opt Express. 2022 Apr 11;30(8):13305-13319. doi: 10.1364/OE.455728.
Physical parameters of a spectral beam combining (SBC) system for multiple Yb-doped fiber lasers (YDFLs) were identified and numerically analyzed to obtain the optimal beam quality and the combining efficiency. We proposed an optimal range of the parameters that can be utilized in SBC systems. For a practical SBC system composed of a multi-layer dielectric grating and a transform mirror, we systematically varied input laser parameters such as the incident angle, beam diameter, laser linewidth, spectral spacing, number of beams, and their spatial separation. Characteristics of diffracted beams by the SBC system were numerically analyzed using a Fourier modal method (FMM). The beam quality M2 and the combining efficiency, η, were optimized by varying the laser beam parameters. We found that M2 and η were most affected by the angle of incidence and the laser linewidth, respectively. We presented the optimal parameters for three, five, and seven linear beam array SBCs along with a range of allowed parameters that could be used in the laser power scaling.
对用于多个掺镱光纤激光器（YDFL）的光谱光束合成（SBC）系统的物理参数进行了识别和数值分析，以获得最佳光束质量和合成效率。我们提出了可用于SBC系统的参数的最佳范围。对于由多层介质光栅和变换镜组成的实际SBC系统，我们系统地改变了输入激光参数，如入射角、光束直径、激光线宽、光谱间距、光束数量及其空间间隔。使用傅里叶模态方法（FMM）对SBC系统衍射光束的特性进行了数值分析。通过改变激光束参数对光束质量M²和合成效率η进行了优化。我们发现M²和η分别受入射角和激光线宽的影响最大。我们给出了三个、五个和七个线性光束阵列SBC的最佳参数以及可用于激光功率缩放的一系列允许参数。
