Large-bandwidth, high-sensitivity, and large dynamic range electric field sensors are gradually replacing their traditional counterparts. The lithium-niobate-on-insulator (LNOI) material has emerged as an ideal platform for developing such devices, owing to its low optical loss, high electro-optical modulation efficiency, and significant bandwidth potential. In this paper, we propose and demonstrate an electric field sensor based on LNOI. The sensor consists of an asymmetric Mach–Zehnder interferometer (MZI) and a tapered dipole antenna array. The measured fiber-to-fiber loss is less than -6.7 dB, while the MZI structure exhibits an extinction ratio of greater than 20 dB. Moreover, 64-QAM signals at 2 GHz were measured, showing an error vector magnitude (EVM) of less than 8%.

In this Letter, we report on widely tunable pulse generation from a red-diode-clad-pumped mid-infrared (mid-IR) Er3+/Dy3+ codoped ZrF4 fiber laser, for the first time, to the best of our knowledge. Using a Fe2+:ZnSe crystal, continuously tunable Q-switched pulses across the range of 3.06–3.62 µm have been attained, which not only represents the widest range (in wavelength domain) from a pulsed rare-earth-doped fiber laser at any wavelength, but also almost entirely covers the strong absorption band of C-H bonds in the mid-IR, providing a potential way for gas detection and polymer processing. In addition, the commercial InAs quantum-well-based saturable absorbers (SAs) have been employed instead, and the obtained longest Q-switching wavelength of 3.39 µm is slightly shorter than 3.444 µm determined by its nominal direct bandgap of 0.36 eV.

在IGZO型TFT⁃LCD器件阵列四次光刻工艺条件下，研究了薄膜晶体管图形设计对实做图形的影响，得到了不同沟道长设计、补偿设计对半色调掩膜光刻后沟道区域光刻胶图形拖尾、内缩、膜厚的影响趋势。实验测量结果表明，沟道长设计值L在3 μm~10 μm时，L越大，光刻胶内缩量越大，拖尾量越小，沟道内光刻胶膜厚越小；L＞10 μm时，光刻胶内缩量、拖尾量、膜厚趋于平稳。基于以上趋势，通过对沟道长设计优化和图形补偿设计，可有效改善光刻胶内缩和拖尾对实做沟道长宽比的影响，同时获得合适的沟道光刻胶膜厚。

文章提出了一种3-μm中红外波段偏振无关且CMOS兼容的石墨烯调制器，器件主要包括两部分：模式转换结构及石墨烯调制器。该调制器不仅满足于CMOS兼容的要求，而且能够实现基膜的偏振无关调制。仿真结果表明该调制器在2.95 μm到3.05 μm的中红外波段能够实现高于20 dB的消光比，TE和TM模式的插入损耗都低于1.3 dB，其偏振相关损耗低于1.09 dB。通过计算，当器件长度为420 μm，能够获得高达9.47 GHz的3 dB带宽。

提出了一种主动锁模光电振荡器（OEO）方案，可以实现高阶谐波锁模，从而产生具有高重复频率的微波脉冲信号。在所提方案中，通过在OEO腔内的电光强度调制器直流偏置端口引入一个正弦驱动信号，当该正弦信号的频率 ${f_{bias}}$为OEO环腔自由光谱范围的整数倍 $N$时，实现基频（ $N = 1$）或谐波（ $N \geqslant 2$）锁模，输出重复频率为 ${f_{bias}}$的微波脉冲信号。实验中分别实现了10阶、50阶和100阶谐波锁模，输出微波脉冲信号的重复频率分别为360 kHz、1.8 MHz和3.6 MHz。该方案为脉冲多普勒雷达等系统应用提供了一种全新的、具备低相噪潜力的微波脉冲信号产生的技术途径。

为了提高光电探测设备目标探测与识别的能力，设计了一套可见/中波双波段共口径光学系统。根据实际工程经验总结了一套分段设计、组合优化的光学设计方法，通过合理地分配光焦度，分段选择合适的初始结构，再现了双波段共口径光学系统初始结构的设计过程；结合CodeV和TracePro软件量化了制冷型中波红外探测系统的冷反射现象，并且通过外场试验成像验证了分析结论的正确性。双波段共口径光学系统最大视场达到1.25°，畸变小于0.1%，可以在环境温度?30 ℃～50 ℃下工作，中波红外探测系统实现了100%冷光阑匹配，可见光探测系统可以实现大、小视场的切换，双波段成像系统具有调焦、调光功能。该系统成像质量良好、可加工性好、装配难度小、工程可实施性强。