Author Affiliations
Abstract
School of Physics Science and Information Engineering, Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng 252000, China
Wavelength-tunable dissipative solitons and amplifier similaritons have been obtained by inserting all-fiber Mach–Zehnder interferometer (MZI) filters with different free spectral ranges (FSRs) in a Yb-doped mode-locked fiber laser. The MZI filter is fabricated by splicing one segment of seven-core fiber (SCF) between two segments of single-mode fibers. The bandwidth of the filter depends on the FSR of the modulated interference curve and consequently depends on the tapered fiber diameter. Inserting MZI filters with bandwidths in a fiber laser and applying a tensile strain on the tapered SCF, both wavelength-tunable dissipative solitons and amplifier similaritons have been obtained.
mode-locked fiber laser dissipative soliton amplifier similaritons Mach–Zehnder interferometer Chinese Optics Letters
2023, 21(4): 041401
Author Affiliations
Abstract
Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, China
Laser writing is a fast and efficient technology that can produce graphene with a high surface area, whereas laser-induced graphene (LIG) has been widely used in both physics and chemical device application. It is necessary to update this important progress because it may provide a clue to consider the current challenges and possible future directions. In this review, the basic principles of LIG fabrication are first briefly described for a detailed understanding of the lasing process. Subsequently, we summarize the physical device applications of LIGs and describe their advantages, including flexible electronics and energy harvesting. Then, chemical device applications are categorized into chemical sensors, supercapacitors, batteries, and electrocatalysis, and a detailed interpretation is provided. Finally, we present our vision of future developments and challenges in this exciting research field.Laser writing is a fast and efficient technology that can produce graphene with a high surface area, whereas laser-induced graphene (LIG) has been widely used in both physics and chemical device application. It is necessary to update this important progress because it may provide a clue to consider the current challenges and possible future directions. In this review, the basic principles of LIG fabrication are first briefly described for a detailed understanding of the lasing process. Subsequently, we summarize the physical device applications of LIGs and describe their advantages, including flexible electronics and energy harvesting. Then, chemical device applications are categorized into chemical sensors, supercapacitors, batteries, and electrocatalysis, and a detailed interpretation is provided. Finally, we present our vision of future developments and challenges in this exciting research field.
laser-induced graphene flexible electronics energy harvesting chemical sensors supercapacitors electrocatalysis Journal of Semiconductors
2023, 44(3): 031701
1 江苏大学微纳米科学技术中心，镇江 212013
2 南京大学固体微结构物理国家重点实验室，南京 210093
基于金属包裹的多孔硅衬底具有制备成本低、检测能力强的优点。自20世纪表面增强拉曼散射(SERS)现象被发现以来，多孔硅-Au/Ag复合材料逐渐展现出作为SERS衬底的优势，被广泛应用于生物、化学、医疗等领域。本文综述了近些年来基于多孔硅复合Au/Ag纳米颗粒混合平台的研究，重点讨论了将贵金属Ag/Au复合于多孔硅衬底上的制备方法，介绍了它们在不同制备条件下枝晶结构的生长形貌和检测性能，并对多孔硅-Ag/Au枝晶复合结构作为SERS衬底的未来发展进行简要分析。
多孔硅 表面增强拉曼散射(SERS) 复合材料 枝晶结构 porous silicon surface-enhanced Raman scattering (SERS) AgNPs/AuNPs AgNPs/AuNPs complex meterial dendritic structure
聊城大学物理科学与信息工程学院，山东 聊城 252000
研究了锥型多芯光纤模间耦合所产生的干涉在温度传感中的应用。利用弱耦合多芯光纤拉锥后变成强耦合多芯光纤，从而产生超模干涉的特点，在单模光纤中熔接一段弱耦合七芯光纤。经氢气火焰匀速往返拉锥后，该光纤直径变小，芯间距减小到一定程度后产生超模干涉，从而得到了结构简单、灵敏度高、特异性强的温度传感器。研究发现，拉锥后的光纤直径越小、锥区长度越长，模间耦合越强。选取锥区长度为1.8 μm、锥区直径为31.36 μm的锥型多芯光纤，所设计制作的温度传感器的灵敏度可达840 pm/℃，比之前报道的高约52.7倍。
光纤光学 多芯光纤 超模干涉 温度 传感器 激光与光电子学进展
2021, 58(7): 0706007
1 东北大学信息科学与工程学院, 辽宁 沈阳 110819
2 河北交通职业技术学院电气与信息工程系, 河北 石家庄 050091
3 北京师范大学遥感科学国家重点实验室, 北京 100875
场景理解是信息科学里的重要研究内容,而三维(3D)数据相比于二维(2D)数据有着众多优势。目前点云的获取有多种方式,且不同获取方式的点云具有不同的特点,此外,基于点云的3D场景理解中的关键技术研究还没有完整、系统的综述。为此,总结了不同方式的点云获取方法,并对不同的点云数据及相关数据库进行对比分析。基于目前3D场景理解的研究进展,针对3D场景理解中的点云滤波、特征提取与点云分割和点云语义分割等技术进行了对比分析与总结。通过对近些年国内外文献的结论进行梳理,凝练出3D场景理解关键技术中存在的问题,并对3D场景理解问题的发展趋势做了展望。基于点云的3D场景理解因其数据的丰富性而被广泛应用在众多领域中,但是目前基于3D点云的场景理解效果,尤其是针对具有颜色信息的激光点云的场景理解,还有众多内容有待深入研究。
机器视觉 三维点云 场景理解 语义分割 激光与光电子学进展
2019, 56(4): 040002
1 上海工程技术大学机械与汽车工程学院, 上海 201620
2 上海拓璞数控科技股份有限公司, 上海 201111
提出了一种基于加速稳健特征(SURF)算法的精确定位的方法,通过识别地面铺设的二维(QR)码完成了定位预判与姿态矫正。对获取的QR图像进行预处理,并采用SURF算法提取图像中的特征点信息,匹配实时图像与目标图像的特征点,并利用最小二乘拟合获取图像间的转换矩阵,将转换矩阵与自动导引车(AGV)的视觉导引模型结合以实现AGV的精确定位。实验结果表明,在结构尺寸较大的重载AGV中,所提算法的定位稳健性较好,精度达到±1 mm。
测量 自动导引车 视觉导引 二维码 精确定位 激光与光电子学进展
2019, 56(10): 101203
1 上海大学 材料科学与工程学院,上海 200444
2 中国科学院苏州纳米技术与纳米仿生研究所,江苏 苏州215123
基于硅基半导体器件的功放模块, 由于器件本身物理结构特性引起的功放开关时间以及开关时上升沿、下降沿斜率的控制不当, 导致调制邻道功率(Modulation of Adjacent Channel Power, ACP)以及瞬态切换邻道功率(Adjacent channel transient power, ACTP)较差, 从而引起邻道干扰。针对硅基半导体器件功放模块在数字对讲机中的应用, 创造性地提出了一种新的方法, 对功放栅极偏置电路优化, 从理论上分析和推导出功放开关时间以及开关时上升沿、下降沿斜率对ACP以及ACTP的影响, 并在实际应用中通过适当调节对讲机功放模块栅极偏置电路电容以及串联电阻, 实现了功放开关的上升沿以及下降沿斜率调节。实验结果表明: 该方法在不影响功放输出功率以及效率的前提下, 当信道间隔为12.5 kHz时, ACP<-60 dBc,ACTP<-50 dBc, 有效改善了ACP、ACTP的性能, 具有一定的实际意义和应用价值。
硅基半导体器件 数字对讲机 调制邻道功率 瞬态切换邻道功率 偏置电路 silicon based semiconductor devices digital two-way radio modulation of adjacent channel power adjacent channel transient power bias circuit 红外与激光工程
2019, 48(5): 0521005
Author Affiliations
Abstract
A passively Q-switched tunable Yb-doped double-clad fiber laser is demonstrated with graphene epitaxially grown on SiC. The spectral tuning of the Q-switched fiber laser is implemented by rotating a quartz plate filter inside the cavity. The central wavelength of the fiber laser can be continuously tuned from 1038.54 to 1056.22 nm. The maximum pulse energy of 0.65 \mu J is obtained at the pump power of 4.08 W, and the corresponding pulse duration and average output power are 1.60 \mu s and 35 mW, respectively.
140.3540 Lasers, Q-switched 140.3510 Lasers, fiber 140.3600 Lasers, tunable 140.3538 Lasers, pulsed Chinese Optics Letters
2014, 12(2): 021405
1 山东大学信息科学与工程学院, 山东 济南 250100
2 济南山信光电科技有限公司, 山东 济南 250100
基于耦合的Ginzburg-Landau方程和各器件的琼斯矩阵，建立了全正色散锁模光纤激光器的数值模型，计算了腔内各点脉冲不同部分的偏振态。计算结果表明，当线性双折射较强时，光纤中脉冲的偏振态近似以拍长为周期变化，一个拍长内的演化过程为右旋椭圆偏振光线偏振光左旋椭圆偏振光线偏振光右旋椭圆偏振光。与一般的饱和吸收体不同，非线性偏振旋转等效饱和吸收体的调制深度随波片角度变化。计算了波片方位角改变时，调制深度的变化情况。相比于偏振分束器之前的1/2波片及1/4波片，偏振分束器之后的波片对调制深度的影响更大。
激光器 光纤激光器 锁模 非线性偏振旋转 全正色散
Author Affiliations
Abstract
The fluorescence spectrum and thermal properties of the mixed crystal Nd:Lu0.99La0.01VO4 are determined. The strongest emission peak located at 1065.6 nm had a full width at half maximum (FWHM) of 2.1 nm. Continuous-wave (CW) laser performance is demonstrated by a compact planar–planar cavity that is endpumped by a diode laser. The laser output characteristics are investigated by using output couplers with different transmissions. A maximum CW output power of 8.09 W was obtained at an incident pump power of 19.4 W, which corresponds to an optical-to-optical conversion efficiency of 41.7% and a slope efficiency of 54.6%. The dependence of optimum transmission on pump power is calculated theoretically and is found to be consistent with experimental results.
140.3380 Laser materials 350.6830 Thermal lensing 140.3480 Lasers, diode-pumped 140.3580 Lasers, solid-state Chinese Optics Letters
2013, 11(12): 121404
