采用高温固相法制备了一种具有颜色变化的长余辉发光材料Mg₃Y₂Ge₃O₁₂∶Pr³⁺。通过X射线衍射、激发发射光谱、余辉衰减及热释光曲线等，对样品的结构、发光及余辉性能进行了系统分析。在283 nm激发下，发射光谱在485 nm和609 nm处表现出两个较强的尖峰发射，分别归属于Pr³⁺离子的³P₂→³H₄及³P₀→³H₆能级跃迁。通过对Pr³⁺离子浓度的调控，有效改变了绿光和红光的相对发射强度，从而实现了发光颜色的多色化。此外，在激发光源停止后该材料同样具有多色的余辉发射，对于最佳样品（Mg₃Y₂Ge₃O₁₂∶0.015Pr³⁺）的余辉时间可达1 200 s以上。之后，我们通过热释光曲线具体研究了陷阱的分布及余辉的充放能过程。结果表明，Mg₃Y₂Ge₃O₁₂∶0.015Pr³⁺材料中浅陷阱的浓度相对较低从而导致室温下的余辉性能较弱。由于材料在高温区域具有超宽带陷阱分布，因此，我们进一步探究了其在高温下的多色长余辉性能。在本工作中，我们成功制备了一种单一离子激活的发光及余辉颜色可调的长余辉发光材料，考虑到其在室温以及高温条件下都具有发光及余辉颜色变化的特点，该材料在高温预警标识以及防伪领域有着潜在的应用价值。

This study investigated direct fluorescence generation from a nematic liquid crystal (NLC) NJU-LDn-4 under femtosecond laser excitation. The absorption, transmittance, excitation, and emission spectra of the NLC were assessed. The relationship between the femtosecond pump power and fluorescence intensity was analyzed, revealing a quadratic increase and indicating that two-photon absorption (2PA) is the primary fluorescence mechanism. The LC microstructure was designed using photoalignment technology, allowing the generated fluorescence to reflect the corresponding structure. This research can establish a foundation for tunable LC microstructured fluorescence, with potential applications in fluorescence microscopy and optoelectronics.

高能同步辐射光源（HEPS）是国内首台第四代同步辐射光源，包括一个储存环、一个增强器以及一个直线加速器。作为典型的低发射度储存环（LER），其动力学孔径远小于物理孔径，对此选择了一种新颖的在轴置换注入方案。其中，增强器负责实现束流从500 MeV到6 GeV的升能。为了降低增强器引出冲击磁铁的冲击强度，在引出环节之前使用4台凸轨磁铁来辅助冲击磁铁完成这一动作。凸轨磁铁磁场波形要求底宽小于1 ms的半正弦波。根据仿真以及测试结果，采用绝缘栅双极型晶体管（IGBT）串联快恢复二极管的经典LC谐振电路拓扑。此外，设计了能量回收支路，来降低电容在充电过程中功率损耗以及对输出脉冲电流波形的影响。目前，已完成脉冲电源样机的研制与测试，各项结果表明，该脉冲电源能够满足高能光源增强器高能引出系统的各项要求。

Wide-field linear structured illumination microscopy (LSIM) extends resolution beyond the diffraction limit by moving unresolvable high-frequency information into the passband of the microscopy in the form of moiré fringes. However, due to the diffraction limit, the spatial frequency of the structured illumination pattern cannot be larger than the microscopy cutoff frequency, which results in a twofold resolution improvement over wide-field microscopes. This Letter presents a novel approach in point-scanning LSIM, aimed at achieving higher-resolution improvement by combining stimulated emission depletion (STED) with point-scanning structured illumination microscopy (psSIM) (STED-psSIM). The according structured illumination pattern whose frequency exceeds the microscopy cutoff frequency is produced by scanning the focus of the sinusoidally modulated excitation beam of STED microscopy. The experimental results showed a 1.58-fold resolution improvement over conventional STED microscopy with the same depletion laser power.

Inverse design focuses on identifying photonic structures to optimize the performance of photonic devices. Conventional scalar-based inverse design approaches are insufficient to design photonic devices of anisotropic materials such as lithium niobate (LN). To the best of our knowledge, this work proposes for the first time the inverse design method for anisotropic materials to optimize the structure of anisotropic-material based photonics devices. Specifically, the orientation dependent properties of anisotropic materials are included in the adjoint method, which provides a more precise prediction of light propagation within such materials. The proposed method is used to design ultra-compact wavelength division demultiplexers in the X-cut thin-film lithium niobate (TFLN) platform. By benchmarking the device performances of our method with those of classical scalar-based inverse design, we demonstrate that this method properly addresses the critical issue of material anisotropy in the X-cut TFLN platform. This proposed method fills the gap of inverse design of anisotropic materials based photonic devices, which finds prominent applications in TFLN platforms and other anisotropic-material based photonic integration platforms.