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中文摘要：
研究了ZnO薄膜脊状波导结构的光学特性，并通过在ZnO薄膜上覆盖MgO外延层方式，降低随机激光器的散射损耗。采用有限时域差分法（FDTD）数值模拟得出了仿真结果，验证了ZnO脊状波导随机激光器可以实现高度方向化出射，带有MgO外延层的ZnO脊状波导随机激光器可以避免激光的非轴向出射和降低散射损耗等特性。
英文摘要：
The optical properties of ZnO thin-film ridge-waveguide are studied, and the reduction of scattering loss inside the random cavities can also be obtained by covered ZnO films with MgO capped layer. Additionally, the finite difference time domain（FDTD） method for numerical calculation is utilized. The simulation results show that random laser with low scattering loss and directional optical output from the facets can be reached by employing annealed ZnO thin-film ridge-waveguide with a MgO capped layer.
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