为实现高功率的蓝光半导体激光输出，对蓝光巴条的封装技术进行了研究。利用金锡硬焊料封装了高功率氮化镓（GaN）蓝光半导体激光巴条，应用铜钨过渡热沉作为缓冲层抑制了铜热沉和GaN激光芯片之间封装残余应力，采用高精度贴片机将芯片共晶键合在铜钨过渡热沉上。贴片质量的好坏直接影响了器件的输出特性，所以重点分析了贴片机的焊接温度焊接压力、焊接时间对器件的影响。实验结果表明：当贴片机的焊接温度为320 ℃、焊接压力为0.5 N、焊接时间为40 s时，焊料层界面空洞最少，热阻最低为0.565 ℃/W，阈值电流最低为4.9 A，在注入电流30 A时，输出光功率最高为32.21 W，最高光电转换效率达到了23.3%。因此，在优化焊接温度、焊接压力、焊接时间后，利用金锡硬焊料将蓝光半导体激光芯片共晶键合在铜钨过渡热沉的技术方案是实现蓝光半导体激光巴条高功率工作的有效途径。

Four-channel off-axis holography is proposed to simultaneously understand the polarization states and the mode coefficients of linearly polarized (LP) modes in few-mode fiber. Far-field off-axis holograms in the four polarization directions of the fiber laser were acquired at the same moment through a four-channel holographic device. The weights, the relative phase differences, and the polarization parameters of the vector fiber laser mode can be solved simultaneously. The simulated and experimental mode analysis of the laser output by 1060-XP fiber with 6 LP modes at 632.8 nm is conducted, which shows that the similarity of the total intensity distribution of the laser before and after mode analysis is above 0.97. The mode polarization states, the mode weights, and the relative phase differences of the few-mode laser can be determined simultaneously in a single shot by four-channel off-axis holography.

A water track laser Doppler velocimeter (LDV) is developed with advantages of high update rate, high real-time performance, high concealment, light weight, and small dimensions. The water track LDV measures the advance velocity of the underwater vehicle with respect to the surrounding water. The experimental results show that the water track LDV has an accuracy of 96.4% when the moving velocity of the vehicle with respect to the ground exceeds 0.25 m/s. Thus, the water track LDV is promising in the application of underwater navigation to aid the strapdown inertial navigation system.

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.

激光多普勒测速技术以其高精度和高可靠性得到广泛应用，其为运动载体的导航定位提供了一种全新的独立测速手段，在提高定位精度方面发挥了重要作用。随着应用场景的拓展，现有的激光多普勒测速技术亟待进一步的发展和优化。文中从激光多普勒测速仪(Laser Doppler Velocimeter, LDV)的测速原理、种类分类和导航应用研究现状三个方面入手，对用于运动载体导航定位的LDV技术进行综述。可以看到，利用LDV进行组合导航的航迹推算精度已经优于0.01%，达到了高精度导航定位的要求，其中单光束LDV比双光束LDV更适合车载应用，能敏感更多维度速度分量的LDV对导航精度提高的效果更明显。同时，对LDV后续的发展方向进行了展望，LDV与更低成本的SINS进行组合导航是下一步值得研究的方向。可以预见，LDV有望在未来成为覆盖高低速测量、海陆空全领域的高精度独立测速装置，在解决实际科学和工程问题中发挥更大、更重要的作用。

在丝电爆过程中，金属丝的沉积能量是决定爆炸效果的关键参数。在研发连续送丝电爆装置的基础上，提出带载丝电爆炸提高金属丝沉积能量的方法。根据金属丝在电爆过程中的相变理论及旁路并联电阻的非线性时变性，建立了金属丝负载的电阻-能量分段模型。使用带载丝和裸丝分别开展电爆炸实验，同步采集丝电爆过程中的放电波形并分析计算，探究带载丝电爆炸相关机理以及沉积能量的变化规律。结果表明，电爆炸前期，由于载丝带具有绝缘性，其旁路并联电阻大于裸丝，从而使得带载丝电阻大于裸丝；随着欧姆加热的进行，带载丝中液态金属沿轴向由两端向中间聚集，加快了电爆炸相变过程，等效电阻减小，延缓了沿面击穿过程，从而获得更多的能量。

液晶相控阵是一种基于液晶的电控可编程光学相控器件，具有体积小、质量轻、功耗低和易于控制等优点。通过对入射光束相位的调制来精确控制波束转向，不仅实现了器件的空间快速灵活扫描，能够对运动中的目标进行自动跟踪、捕获和瞄准，而且使系统集成度更高，降低了制造成本,可广泛应用于激光雷达和空间光通信等领域。总结了国内外对液晶相控阵技术的研究进展，主要包括波束控制、系统分析建模和系统性能优化。同时也介绍了液晶相控阵在高能激光、空间光通信和激光雷达中的应用研究进展。