硅中钛杂质对激光电场分布影响的数值模拟

采用T-matrix数值方法模拟光学系统常用的光学材料硅中金属钛杂质对激光电场分布的影响。分析了不同球形杂质数目、不同杂质球半径、不同球形杂质间距、不同球形杂质排列以及不同相对介电常数杂质对激光电场分布的影响，通过数值模拟了解到：电场幅值的最大值总是出现在沿入射波极化方向上，电场幅值的增大与相邻两球的耦合有关，且两球间距越小电场幅值的最大值越大；相对介电常数实部越小、虚部越大的杂质会导致较大的电场幅值最大值。

Effects of titanium impurities in silicon on electric-field distribution of laser

The laser can do great damage to optical elements, which has become a problem for developing high power and high energy lasers. A main cause of the damage is the highly absorption of laser by impurities imbedded in optical material. The T-matrix method is adopted for simulating the effects of titanium impurities in silicon on the electric-field distribution of laser. We discuss the effects of some parameters, such as the number of impurities, the radius of the impurity, the distance of impurities, the configuration of impurities and the relative dielectric constant of impurity. With the simulation, we know that the maximum of electric-field magnitude lies in the polarization direction of incident wave, the increase of electric-field magnitude depends on the coupling of two adjacent impurities, the maximum of electric-field magnitude becomes larger with reducing the distance of two impurities, and the maximum of electric-field magnitude can be enlarged with reducing the real part or increasing the imaginary part of relative dielectric constant.