为了解决国内外能见度参数量值无法绝对溯源的问题，利用透射式能见度仪的工作原理、结构特点以及环境条件，提出了溯源至几何量的量值复现方法，设计了1套高透射比量具作为主标准器，实现了对透射式能见度仪的校准，促进了能见度参数量值溯源体系的发展。主标准器遮光体采用精密机械加工工艺，遵循几何量参数测量的绝对溯源法，可大幅减小透射比量值的测量不确定度；主标准器滤光片根据几何量测量和光学透射比参数测量相结合的溯源链，解决了现有技术中高透射比无法复现和准确测量的问题。此外，使用锥形遮光体，可避免引入除旋转因素外的其他不确定度来源，大幅提升了能见度仪分辨率的校准能力。

以衣康酸（IA）作为第二单体，采用水相沉淀聚合法制备出IA含量不同的聚丙烯腈（PAN）粉末，在室温及空气气氛中对衣康酸丙烯腈共聚物（P(AN-co-IA)）粉末进行电子束辐照（EB）处理，吸收剂量为25~200 kGy。通过傅里叶红外光谱仪对P(AN-co-IA)进行化学结构表征，通过差示扫描量热仪及热失重分析仪研究IA含量对PAN环化的影响，及辐照对P(AN-co-IA)粉末热性能的影响。结果表明，EB改性通过自由基机制促进了PAN的环化反应，使其在较低温度下发生；引入IA改性PAN则通过离子机制引发环化反应。两种改性方法对环化的促进作用可以叠加，有协同作用，但随着吸收剂量和IA含量的增加，这种协同作用效果逐渐减小。定义吸收剂量每增加10 kGy，P(AN-co-IA)放热焓的减少量为影响系数，吸收剂量小于100 kGy时，电子束辐照对P(AN-co-IA)放热焓的减少有显著影响，但其影响随着吸收剂量的增加而快速减小，超过100 kGy后，影响系数的减小趋势开始变缓和。

脉冲时域相干合成技术主要通过对功率放大后的高重频脉冲序列进行时序合成，从而降低激光的重复频率，有效地提升输出脉冲的峰值功率与能量，避免放大过程中高峰值功率引起的非线性效应。该技术与空域相干合成相结合，能够突破单纤激光的性能极限，实现高能量、高平均功率和高峰值功率的超短脉冲激光输出，具有广阔的应用前景。介绍了超短脉冲光纤激光时域相干合成的基本原理和关键技术，综述了时域相干合成系统的发展历程及其关键技术的研究现状，重点介绍了近年来脉冲分割放大与脉冲相干堆积技术的研究进展，并对时域相干合成的不同技术路线进行了分析与比较，最后对其未来的发展方向进行了梳理，为相关领域的研究提供参考。

Flexible devices provide advantages such as conformability, portability, and low cost. Paper-based electronics offers a number of advantages for many applications. It is lightweight, inexpensive, and biodegradable, making it an ideal choice for disposable electronics. In this work, we propose a novel configuration of photodetectors using paper as flexible substrates and amorphous Ga2O3 as the active materials, respectively. The photoresponse characteristics are investigated systematically. A decent responsivity yield and a specific detectivity of up to 66 mA/W and 3×1012 Jones were obtained at a low operating voltage of 10 V. The experiments also demonstrate that neither the twisting nor bending deformation can bring obvious performance degradation to the device. This work presents a candidate strategy for the application of conventional paper substrates to low-cost flexible solar-blind photodetectors, showing the potential of being integrated with other materials to create interactive flexible circuits.

微位移工作台是实现高精度定位的关键部件，传统的工作台自由度少且分辨力不高，不能满足应用需求，因此提出一种六自由度高精度微位移工作台结构方案并验证了其性能。在整体结构上采用“串并联混合驱动”的方式和中空结构，将六个自由度的运动合理地分布在平动层，转动层和支撑层三层结构中，并设计开发了工作台的运动控制系统以及一套可搭配使用的运动控制软件。实验结果表明，X，Y，Z轴线位移分别优于20，20和37 μm，角位移行程分别优于39″，33″和27″；线位移分辨力均优于0.7 nm，角位移分辨力均优于0.1″。所提出的六自由度微位移工作台相比于传统工作台具有自由度多、极高分辨力等优点，有望在超精密加工，微电子制造等领域中获得广泛的应用。

We proposed and experimentally demonstrated an all-fiber sensor for measuring bend with high sensitivity based on a ring core fiber (RCF) modal interferometer. The sensor was fabricated by splicing a segment of RCF between two pieces of multimode fiber (MMF) and single-mode fiber (SMF) at the ends of the MMF as lead-in and lead-out. Due to the first segment of the MMF, the transmitted light is coupled into the ring core, silica center, and cladding of the RCF, exciting multiple modes in the RCF. By the modal interferences in the structure, bending sensing can be realized by interrogating the intensity of the interference dip. Experimental results show a high bending sensitivity of -25.63dB/m-1 in the range of 1.0954m-1 to 1.4696m-1. In addition, the advantages of the bend sensor, such as small size, low temperature sensitivity, and simple fabrication process, can be used for curvature measurement in building health monitoring.

Ga2O3-based avalanche photodetectors (APDs) have gained increasing attention because of their excellent photoelectric conversion capability in the UV solar-blind region. Integrating high-quality epitaxial Ga2O3 with p-type semiconductor remains an open challenge associated with the integration difficulty on alleviating its defects and dislocations. Herein, we construct an APD consisting of epitaxial β-Ga2O3/La_0.8Ca_0.2MnO₃ heterostructure. The pn junction APDs exhibit a high responsivity of 568 A/W as well as an enhanced avalanche gain of up to 3.0×105 at a reverse bias voltage of 37.9 V. The integration capability demonstrated in this work provides exciting opportunities for further development of high-performance Ga2O3-based electronics and optoelectronics.