太赫兹调制器作为太赫兹技术应用的重要器件之一，在太赫兹通信、成像和传感等领域具有广泛应用前景。但是目前太赫兹调制器调制深度、工作带宽、稳定性等有待提升，这制约了太赫兹技术的进一步推广与发展。基于此，设计并制备了一种新型光控砷化镓/侧边抛磨太赫兹光纤（SPTF）调制器，将砷化镓转移到太赫兹光纤抛磨区，增强太赫兹波倏逝场与砷化镓相互作用。在外置808 nm激光器照射下实现对太赫兹波幅度调制，调制深度达到97.4%。实验结果表明，这种新型的光纤调制器具有较好的光控调制效果。同时，该器件体积小、集成度高，具有广泛应用的潜力。

为了研究选区激光熔化（SLM）工艺参数对AlSi10Mg成形性能的影响，在不同激光功率下成形了AlSi10Mg试样，采用扫描电镜、X射线衍射仪、拉伸试验机、纳米压痕仪表征了AlSi10Mg试样的熔覆道、缺陷、相组成、组织、力学性能、断口形貌等。结果表明，在350 W激光功率下成形试样的致密度最大（为99.3%），孔洞缺陷最少，熔覆道搭接效果最好，细晶区的晶粒最细小，试样的综合力学性能最好：显微硬度为2.338 GPa，抗拉强度为371.9 MPa，延伸率为12.67%。

To suppress the fluctuation effect due to laser power instability and terahertz radiation fluctuation, a homomorphic filtering method is proposed to process the terahertz images obtained from a pulsed terahertz raster scanning imaging system. The physical model of homomorphic filtering for terahertz imaging is established. The mathematical expressions are given with the specific physical meaning in accordance with the imaging principle. To demonstrate the effectiveness of the method, a homomorphic filtering experiment based on two raw terahertz images selected from the literature using a continuous-wave (CW) terahertz source is also performed. The effect of the method is compared with those described in the literature, and the advantages of homomorphic filtering are discussed. The pulsed- and CW-terahertz image processing results both show that in addition to suppressing the fluctuation effect, the method can also enhance target imaging.