利用高温固相法制备了一系列不同Pr³⁺掺杂浓度的CsLa（WO₄）₂荧光粉，测试了X射线衍射（XRD）、漫反射光谱、激发光谱、发射光谱与荧光衰减曲线，讨论了光致发光光谱与浓度、温度的联系，并基于荧光强度比（FIR）技术计算得出温度传感相关参数。CsLa（WO₄）₂∶Pr³⁺主要呈现源自³P₀和¹D₂能级的发射，对应的最佳掺杂浓度分别为0.03和0.01，经证实电偶极⁃电偶极相互作用导致了浓度猝灭。³P₀与¹D₂能级的发射随温度变化趋势不同，这主要归因于Pr³⁺⁃W⁶⁺的价间电荷迁移（IVCT）、交叉弛豫（CR）和多声子弛豫（MPR）等过程的综合作用。由于上述发射表现出不同的浓度和温度依赖特性，实现了颜色可调谐发光。基于³P₁→³H₅/³P₀→³H₄热耦合能级对和¹D₂→³H₄/³P₀→³H₄非热耦合能级对的FIR，计算得到相对灵敏度分别为586.01/T² K^-1和1 071.78/T² K^-1，表明该材料在温度传感领域具有潜在应用价值。

A novel experimental method is proposed for observing plasma dynamics subjected to magnetic fields based on a newly developed cylindrical theta-pinch device. By measuring simultaneously the temporal profiles of multiple parameters including the drive current, luminosity, plasma density, and plasma temperature, it provides a basis for observing the plasma dynamics of the theta pinch, such as shock transport and magnetohydrodynamic instability. We show that the plasma evolution can be distinguished as three phases. First, in the radial implosion phase, the trajectories of the current sheath and shock wave are ascertained by combining experimental data with a snowplow model (Lee model) in a self-consistent way. Second, in the axial flow phase, we demonstrate that m = 0 (sausage) instability associated with the plasma axial flow suppresses the plasma end-loss. Third, in the newly observed anomalous heating phase, the lower-hybrid-drift instability may develop near the current sheath, which induces anomalous resistivity and enhanced plasma heating. The present experimental data and novel method offer better understanding of plasma dynamics in the presence of magnetic fields, thereby providing important support for relevant research in magneto-inertial fusion.

A real-time wavefront sensing method for arbitrary targets is proposed, which provides an effective way for diversified wavefront sensing application scenarios. By using a distorted grating, the positive and negative defocus images are simultaneously acquired on a single detector. A fine feature, which is independent of the target itself but corresponding to the wavefront aberration, is defined. A lightweight and efficient network combined with an attention mechanism (AM-EffNet) is proposed to establish an accurate mapping between the features and the incident wavefronts. Comparison results show that the proposed method has superior performance compared to other methods and can achieve high-accuracy wavefront sensing in varied target scenes only by using the point target dataset to train the network well.

结温升高是影响主控振荡放大(MOPA)半导体激光芯片输出功率的重要因素，为解决MOPA芯片的多电极封装和高效散热问题，提出了一种正装和热扩散辅助次热沉相结合的封装结构。建立了该封装结构的3D热模型，对比研究了倒装封装结构、正装无辅助次热沉结构与正装有辅助次热沉结构对MOPA半导体激光器结温的影响。计算结果表明，采用正装有辅助次热沉结构与倒装封装结构散热性能接近，且显著优于正装无辅助次热沉结构，结温降低幅度最高可达40%。另外，采用正装有辅助次热沉封装结构的MOPA半导体激光芯片在连续工作条件下输出功率为10.5 W，谱宽可实现半高全宽小于0.1 nm，中心波长随电流的变化约14 pm/A，实现了10 W级MOPA芯片的封装，验证了该封装结构的有效性。

利用高温固相法在1 200℃制备了一系列红色荧光粉（Y_1-x）₆TeO₁₂：xEu³⁺（x=0.1~0.5）材料。对样品进行了X射线衍射、形貌特征、激发和发射光谱、浓度猝灭、热稳定性、荧光衰减曲线以及发光二极管封装与光色电性能等方面的分析与探究。结果表明：该红色荧光粉样品能被近紫外光（393 nm处）和蓝光（464 nm处）有效激发，在632 nm处表现出较强的红光发射。根据荧光强度与掺杂浓度的变化趋势，确定出最佳Eu³⁺掺杂量为x=0.3，更多的掺杂量引起浓度猝灭。进一步分析激活剂Eu³⁺间能量传递类型，得出电偶极-电偶极作用导致了浓度猝灭。（Y_0.7）₆TeO₁₂：0.3Eu³⁺在150℃时积分发光强度是室温的76.5%，热激活能为0.196 9 eV。该样品的荧光寿命为813 μs，色坐标值为（0.637 6，0.343 1），并基于板上芯片工艺进行了发光二极管封装，对光色电性能进行了表征。（Y_1-x）₆TeO₁₂：xEu³⁺荧光粉表现出了良好的发光特性、发光热稳定性及色纯度，在白光发光二极管中具有潜在的应用价值。

设计了一种改进型射频功率源输出功率控制系统，解决了现有射频功率源使用中存在的输出功率稳定性与控制精度不足等问题，预期将应用于中国聚变工程实验堆（China Fusion Engineering Test Reactor，CFETR）负离子源中性束系统（Negative Ion Based Neutral Beam Injection System，NNBI）。采用ARM+CPLD双核设计的软、硬件分离控制结构，保障输出功率控制算法运行效率；采用数字化信号控制方法，实现输出功率的高精度控制；通过精确采样射频功率源实际输出功率和闭环功率控制方法设计，实现输出功率的高稳定性控制。对射频功率源样机进行输出功率控制系统模拟负载测试，结果表明：在额定输出功率为50 kW时，输出功率的控制精度高于0.1%、稳定性波动小于0.5%、人机交互软件功能完善。该方案预期可以搭配阻抗匹配网络满足CFETR NNBI射频功率源对输出功率控制的性能要求。