为了改善和优化眼镜镜片的加工流程，避免镜片尖边加工过程中刀轴矢量变化剧烈、影响工件表面的加工质量，提出了一种基于UG NX的五轴数控加工路径。利用智能镜框扫描仪对镜框边缘进行扫描，获得镜框凹槽点云数据文件，编写相应程序对符合眼镜片加工标准的OMA文件中的球坐标数据进行坐标及格式转换等处理。基于NURBS曲线拟合算法，实现刀路轨迹的连续性并保证拟合曲线的精度。设计和建立一种控制刀轴矢量平滑变化的刀轴驱动约束方法，依靠曲线驱动刀轴及镜片曲面法向量约束刀轴使刀头平滑进给，并将刀轨文件经过后处理转换为NC文件。最后，对加工后的镜片进行误差测量，结果表明，通过点云数据拟合刀路曲线的方法提高了加工面的精确度和光滑性，有效缩减了加工流程，提高了加工效率。

Holographic display stands as a prominent approach for achieving lifelike three-dimensional (3D) reproductions with continuous depth sensation. However, the generation of a computer-generated hologram (CGH) always relies on the repetitive computation of diffraction propagation from point-cloud or multiple depth-sliced planar images, which inevitably leads to an increase in computational complexity, making real-time CGH generation impractical. Here, we report a new CGH generation algorithm capable of rapidly synthesizing a 3D hologram in only one-step backward propagation calculation in a novel split Lohmann lens-based diffraction model. By introducing an extra predesigned virtual digital phase modulation of multifocal split Lohmann lens in such a diffraction model, the generated CGH appears to reconstruct 3D scenes with accurate accommodation abilities across the display contents. Compared with the conventional layer-based method, the computation speed of the proposed method is independent of the quantized layer numbers, and therefore can achieve real-time computation speed with a very dense of depth sampling. Both simulation and experimental results validate the proposed method.

尽管纹身的人数在增加，但希望祛除纹身的需求量也在增加。现在纹身祛除大多采用激光进行治疗，但仅凭肉眼观察的单次疗效不够理想，往往需要重复治疗。因此，研究了基于图像技术量化评价治疗的效果。使用皮秒激光对猪皮的不同颜色的纹身进行照射，采集治疗部位与正常皮肤组织的图像，再标准化提取部位，并对此部位的图像进行特征提取后，量化照射前后的纹身所占面积比，进而得到祛除率。为了验证量化算法的可靠性，设计了不同对比度的标准图像来计算色素占比，得到的误差均小于0.01%，证明该算法是可靠的。对于色素祛除的量化评价能客观反映激光祛除色素的效果，避免了因医师的主观判断所造成的疗效偏差，为治疗参数的选择及疗效的提高等提供了帮助。

为了研究磁性水凝胶的磁致折射率变化及其在磁致光传感领域的应用，通过共混法制备了聚乙烯醇/四氧化三铁（PVA/Fe₃O₄）磁性水凝胶，并基于光纤端面反射法测试了该磁性水凝胶在不同外加磁场下的折射率变化，测得其磁致光折射率变化规律。在此基础上设计了磁性水凝胶锥形光纤传感结构。实验表明，在环境温度22 ℃，磁粒子浓度2.1%时，6.4~22.6 mT范围内基于磁性水凝胶的光纤磁场传感元件波长偏移灵敏度为86.42 pm/mT；磁粒子浓度2.9%时，5.5~30 mT范围内该传感元件波长偏移灵敏度为51.42 pm/mT。该类磁性水凝胶在光纤磁传感测量方面具有良好的应用价值。

In this study, a batch of indium tin oxide (ITO)/Sn composites with different ratios was obtained based on the principle of thermal evaporation by an electron beam. The crystalline structure, surface shape, and optical characterization of the films were researched using an X-ray diffractometer, an atomic force microscope, a UV-Vis-NIR dual-beam spectrophotometer, and an open-hole Z-scan system. By varying the relative thickness ratio of the ITO/Sn bilayer film, tunable nonlinear optical properties were achieved. The nonlinear saturation absorption coefficient β maximum of the ITO/Sn composites is -10.5×10-7cm/W, approximately 21 and 1.72 times more enhanced compared to monolayer ITO and Sn, respectively. Moreover, the improvement of the sample nonlinear performance was verified using finite-difference in temporal domain simulations.