电子科技大学光电科学与工程学院电子薄膜与集成器件国家重点实验室,四川 成都 610054
报道了一种基于交叉偏置磁场的单光束单调制三轴原子磁力仪。基于Bloch方程研究了单光束泵浦探测结构实现三轴磁场检测的理论,提出使用交叉偏置磁场来旋转原子自旋极化方向实现三轴磁场探测的方案,并通过实验进行了验证。仅采用单一调制磁场,在抑制低频噪声的前提下避免了磁场串扰问题。实验结果表明:在零磁场环境下,系统对X轴方向待测磁场的响应带宽为90 Hz,系统灵敏度为21 fT/(Hz1/2);在Z轴方向施加34 nT的偏置磁场时,系统对Y轴方向待测磁场的响应带宽为130 Hz,系统灵敏度为26 fT/(Hz1/2);在Y轴方向施加38 nT的偏置磁场时,系统对Z轴方向待测磁场的响应带宽为128 Hz,系统灵敏度为29 fT/(Hz1/2)。该三轴原子磁力仪体积小、结构简单且制作成本低,有望应用于生物医疗等领域。
原子磁力仪 三轴磁场 灵敏度 无自旋交换弛豫 弱磁检测 激光与光电子学进展
2024, 61(5): 0512005
Author Affiliations
Abstract
1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
2 School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
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%.
thin-film lithium niobate electric field sensor QAM signal Chinese Optics Letters
2023, 21(12): 120041
Author Affiliations
Abstract
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
In this Letter, we report on widely tunable pulse generation from a red-diode-clad-pumped mid-infrared (mid-IR) codoped fiber laser, for the first time, to the best of our knowledge. Using a 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.
Q switching continuous tunability Fe2+:ZnSe InAs ZrF4 fiber Chinese Optics Letters
2023, 21(4): 041402
1 中国科学院光电技术研究所 光束控制重点实验室, 成都 610209
2 电子科技大学 光电科学与工程学院, 成都 610054
3 中国科学院大学, 北京 100049
4 中国民用航空飞行学院, 四川 广汉 618307
基于压缩感知和单像素成像的基本原理, 设计了一种用于图像超分辨率重建的新型深度卷积神经网络架构。这种单像素超分辨率成像算法成功地将深度学习图像超分辨率重建技术与压缩感知单像素成像技术相结合, 从而发展出一种全新的深度学习单像素成像优化方法。与传统的常规压缩感知图像重构算法相比, 该算法有效提升了图像超分辨率重建精度和单像素成像质量。通过图像重建的仿真实验和单像素相机的成像实验验证, 结果表明这种基于深度学习的新型单像素相机成像方式具有良好的性能表现。
单像素成像 压缩感知 深度学习 超分辨率 图像重构 single pixel imaging compressed sensing deep learning super-resolution image reconstruction
电子科技大学 光电科学与工程学院, 成都 611731
利用COMSOL软件设计了一种基于S型Y分支SOI脊波导的石墨烯M-Z电光调制器, 并对Y分支波导曲率半径、相位臂长度、芯层间距和输入输出直波导长度等结构参数对调制器的影响进行了分析。在此基础上对电光调制器的性能指标进行了计算和优化, 最终设计出了3dB带宽为143GHz、消光比为15.05dB的硅基石墨烯M-Z电光调制器。
石墨烯 M-Z电光调制器 S型Y分支波导 绝缘体上硅脊形波导 graphene M-Z electro-optical modulator S-Y branch waveguide silicon-on-insulator ridge waveguide
电子科技大学光电科学与工程学院, 四川 成都 611731
玻璃、透镜等透明物体在光学系统中有广泛的应用,表面质量优劣对系统性能有较大的影响。利用光的偏振特性,提出一种基于偏振透射结构光的表面缺陷检测方法。利用所搭建的透射系统产生偏振透射条纹结构光,该结构光投射到被测物体表面,经被测物体后发生变形;然后采集变形条纹,提取相位信息,解出调制度,得到被测物体的表面缺陷信息。实验结果表明:所提方法能够消除灰尘的影响,并可以有效提高系统信噪比,有望用于平板厚透镜、大曲率光学透镜等透明物体的缺陷检测。
测量 表面缺陷检测 透射光学元件 偏振透射结构光 条纹调制度 光学学报
2021, 41(18): 1812002
红外与激光工程
2021, 50(7): 20211053