1 江苏师范大学江苏省先进激光材料与器件重点实验室，江苏 徐州 221116
2 山东大学光学高等研究中心，山东 青岛 266237
3 同济大学高等研究院物理科学与工程学院，上海 200092
4 江苏省先进激光材料与器件国际合作联合实验室，江苏 徐州 221116
单晶光纤（SCF）具有长径比高、比表面积大、散热好等优势，近年来成为高功率激光振荡器及放大器的选择材料之一。采用光线追迹法，模拟分析了泵浦光在Tm∶YAG SCF中的传播模式及强度分布情况。采用1.7 μm激光二极管（LD）作为泵浦源进行共振泵浦，将模式匹配和泵浦光导波传输结构相结合，实现了Tm∶YAG SCF连续激光运转，在~2.02 μm处获得了7.85 W的功率输出，对应入射泵浦功率的斜效率为46.3%。
激光器 固体激光器 共振泵浦 Tm∶YAG单晶光纤 泵浦导波
1 燕山大学理学院，亚稳材料制备技术与科学国家重点实验室，河北省微结构材料物理重点实验室，河北 秦皇岛 066004
2 中国科学院西安光学精密机械研究所，瞬态光学与光子技术国家重点实验室，陕西 西安 710119
提出并研究了一种以硫系玻璃为基底材料的红外负曲率反谐振光纤，该光纤在4 μm附近可低损耗、单模单偏振传输光信号。利用有限元法对其性能进行数值仿真，结果表明：该光纤在3.99~4.00 μm波长范围内具有良好的单模单偏振特性，特别是在4 μm波长处，偏振消光比和高阶模式消光比分别达到491和649，表明其保偏性能具有很好的稳定性；该光纤具有低损耗传输特性，在3.92~4.01 μm波长范围内，偏振基模均可维持在平坦且损耗很低的反谐振区域内，尤其在4 μm波长处，偏振基模的损耗仅为1.8×10-4 dB/m；该光纤具有良好的抗弯曲能力，在单模单偏振传输下，弯曲损耗始终小于10-3 dB/m。该红外负曲率反谐振光纤不仅在中红外波段的通信和医疗系领域具有良好的应用前景，也为工作在4 μm波段的量子级联探测器提供了纯净光源。
光纤光学 负曲率空芯光纤 空芯反谐振光纤 单模 单偏振 有限元法 光学学报
2023, 43(19): 1906003
Author Affiliations
Abstract
1 School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao, China
2 Key Laboratory of Laser & Infrared System (Shandong University), Ministry of Education, Qingdao, China
3 Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, Jinan, China
4 Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services, SCCE, University of Science and Technology Beijing, Beijing, China
We firstly report a 2-μm all-fiber nonlinear pulse compressor based on two pieces of normal dispersion fiber (NDF), which enables a high-power scaling ability of watt-level and a high pulse compression ratio of 13.7. With the NDF-based all-fiber nonlinear pulse compressor, the 450-fs laser pulses with a repetition rate of 101.4 MHz are compressed to 35.1 fs, corresponding to a 5.2 optical oscillation cycle at the 2-μm wavelength region. The output average power reaches 1.28 W, which is believed to be the highest value never achieved from the previous 2-μm all-fiber nonlinear pulse compressors with a high pulse repetition rate above 100 MHz. The dynamic evolution of the ultrafast pulse inside the all-fiber nonlinear pulse compressor is numerically analyzed, matching well with the experimental results.
few-optical-cycle pulses high pulse repetition rate nonlinear pulse compression High Power Laser Science and Engineering
2023, 11(1): 01000e14
山东大学光学高等研究中心，山东 青岛 266237
为得到不添加额外吸收剂的透明聚碳酸酯（PC）焊接试样，使用波长1710 nm和1910 nm的激光对PC进行了透射焊接研究，通过观察焊缝外观和测试焊缝强度以确定焊接试样的质量。试验结果表明：1710 nm和1910 nm的激光可以得到强度接近、焊接效果较好的PC试样；使用1710 nm的激光，在功率为20 W、焊接速度为6.5 mm/s、离焦量为-6 mm时，得到了最大拉断力为1334.4 N、焊接外观效果较好的PC试样，试样的强度达到了PC本体的60.9%。
激光技术 透明塑料 激光焊接 聚碳酸酯 激光与光电子学进展
2023, 60(1): 0114003
Author Affiliations
Abstract
1 Laboratory of Optical Fibers and Micro-nano Photonics, School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei 230009, China
2 Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education, School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, China
3 State Key Laboratory of Environmental Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621000, China
4 School of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang 277160, China
There are many kinds of materials or methods used to make optical microcavities, and they have many different geometric structures. And electrospinning technique has become a very convenient and easy one to prepare polymer fiber. Based on this situation, PM597-doped polymer solution was prepared into high-performance fibers with different diameters by electrospinning technology in our work. In order to better study the temperature sensing of polymer fiber whispering gallery mode, we have placed it on two different substrates with gold and aluminum. A 532 nm pulsed laser beam was used to excite a single fiber in the radial direction, then the whispering gallery mode (WGM) laser was observed and the distribution of WGM was determined by theoretical calculations. The threshold of samples on aluminum substrate is 0.4 μJ. In addition, it is found that the samples on aluminum substrate performed better in temperature sensing, and the value is 0.13 nm/℃. As a result, WGM polymer fiber microcavities on aluminum substrate made by electrospinning technology have very broad development prospects in biosensing, optical pump lasers and other applications.
Whispering gallery mode gold substrate electrospinning Photonic Sensors
2022, 12(3): 220307
山东大学光学高等研究中心， 山东 青岛 266237
使用1 710 nm半导体激光器，对同种透明聚对苯二甲酸乙二醇酯（PET）塑料进行激光透射焊接，由于透明PET塑料对1.7 μm的激光具有较高吸收率，因此焊接过程无需添加激光吸收剂。通过调整激光功率和焊接速度，探讨了线能量对焊接强度的影响。在激光功率为10 W，焊接速度为7.5 mm/s时，得到了美观牢固的焊接试件，此时的线能量为1.33 J/mm。保持此线能量不变，在激光功率为5~30 W的范围内设计了对比试验。结果表明，激光功率在5~30 W、焊接速度在3.75~22.50 mm/s内改变对焊接试件的焊缝强度影响较小。
聚对苯二甲酸乙二醇酯 透明塑料 激光透射焊接 吸收剂 polyethylene glycol terephthalate（PET） transparent plastic laser transmission welding absorbent
红外与激光工程
2021, 50(3): 20200257
1 焦作师范高等专科学校理工学院, 河南 焦作 454000
2 河南师范大学物理学院, 河南 新乡 453007
3 华北水利水电大学电力学院, 河南 郑州 450045
4 西北工业大学电子信息学院, 陕西 西安 710129
理论研究了一种手性双层等离激元超表面的圆二向色性光谱传感效应。 通过分析其电磁场的空间分布发现,这种由人工结构增强的手性响应的产生归因于等离激元超表面狭缝的局域 等离激元与两层超表面之间的耦合作用,且这种结构的圆二向色性透射光谱与圆共偏振透射光谱的变化对生化 层折射率的变化具有不同的响应。在合适的结构参数下,圆共偏振透射光谱以及圆二向色性透射光谱传感灵敏 度最大分别能够达到109 nm/RIU、111 nm/RIU。该人工手性结构具备共偏振光谱和圆二向色性光谱传感功能, 在新型生化传感器件领域具有潜在的应用价值。
光谱学 传感 有限元方法 手性 圆二向色性光谱 太赫兹波 spectroscopy sensing finite element method chirality circular dichroism spectroscopy terahertz wave
