红外与激光工程
2023, 52(11): 20230158
1 中国科学院西安光学精密机械研究所光子制造系统与应用研究中心,陕西 西安 710119
2 中国科学院大学,北京 100049
为研究飞秒激光加工硬脆透明材料时存在的“微裂纹”与“诱导条纹”等共性工艺问题,利用飞秒时间分辨泵浦探测阴影成像技术,对飞秒激光多脉冲烧蚀石英玻璃过程中的电子动力学过程进行成像,分析了激光脉冲电离材料初期(700 fs之前)等离子体丝的演化情况。多脉冲诱导微结构的存在使成丝区域分布在微结构的两侧与光脉冲传播的轴线方向,前者主要是由微结构侧壁对光脉冲的折射造成的,而后者则是由微结构底面与侧壁形貌不同导致的光程差引起的。实验结果揭示了多脉冲加工过程中脉冲串诱导微结构对后续光场的重塑效应,该效应影响了等离子体成丝区域与能量沉积的分布,这是共性工艺问题产生的核心机制。
激光技术 飞秒激光微加工 泵浦探测阴影成像 多脉冲烧蚀 等离子体 中国激光
2023, 50(24): 2402101
光子学报
2023, 52(10): 1052419
1 北京理工大学光电学院,北京 100081
2 信息光子技术工业和信息化部重点实验室,北京 100081
3 包头师范学院物理科学与技术学院,内蒙古 包头 014030
提出了一种高温大量程的蓝宝石法布里-珀罗(F-P)干涉仪压力传感器。传感器由三层蓝宝石晶片直接键合而成,包括蓝宝石衬底、带通孔的蓝宝石晶片和感压蓝宝石晶片。飞秒激光用于在蓝宝石晶片的中心刻蚀通孔,并粗糙化感压蓝宝石晶片的外表面。利用蓝宝石晶片抛光面作为F-P腔的反射面,有助于降低解调出的光学腔长波动,提高压力分辨率。提出的传感器在室温、0~30 MPa的高压力范围内光学腔长随压力线性变化,压力灵敏度为0.1253 μm/MPa,相对分辨率达到0.04% FS(full scale,全量程),且能在700 ℃下稳定工作。
光纤光学 光纤压力传感器 非本征法布里-珀罗干涉仪 蓝宝石晶片 飞秒激光微加工 大压力量程 光学学报
2023, 43(15): 1506001
1 安徽建筑大学工程机械智能制造重点实验室,安徽 合肥 230601
2 安徽春谷3D打印智能装备产业技术研究院,安徽 芜湖 241000
Finally, the limitations of laser processing at present are summarized, and the application and development of laser micromachining technology in the field of medical equipment in the future are prospected. Although laser microprocessing technology can micro-process a new generation of implantable medical devices with extremely fine structure, making the commercial use of the next generation of implantable medical devices feasible, the development of laser micro-processing technology in the biomedical field is not mature enough, the production efficiency is low, and the work stability needs to be improved. For the laser micromachining process, a complete set of theories has not yet been formed to explain the physical nature of the interaction between the laser and material under the extreme conditions of ultra-fast, ultra-short, and ultra-strong, nor can the impact of laser micromachining on the material structure and physical and chemical properties be well evaluated. The next work still needs a lot of basic and regular research. At the same time, according to the characteristics of laser micromachining and the properties of the processed materials, it is also necessary to develop simulation analysis software to simulate the micromachining process and optimize the parameters of the laser micromachining process.
激光微细加工 血管支架 骨支架 生物材料 抗菌性 laser micromachining vascular stent bone stent biological materials antibacterial
Author Affiliations
Abstract
1 Huazhong University of Science and Technology, Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Wuhan, China
2 Optics Valley Laboratory, Wuhan, China
The Mathieu beam is a typical nondiffracting beam characterized by its propagation invariance and self-reconstruction. These extraordinary properties have given rise to potentialities for applications such as optical communications, optical trapping, and material processing. However, the experimental generation of Mathieu–Gauss beams possessing high quality and compactness is still challenging. In this work, even and helical Mathieu phase plates with different orders m and ellipticity parameters q are fabricated by femtosecond laser two-photon polymerization. The experimentally generated nondiffracting beams are propagation-invariant in several hundred millimeters, which agree with numerical simulations. This work may promote the miniaturization of the application of nondiffracting beams in micronanooptics.
femtosecond laser micromachining two-photon polymerization nondiffracting beams Mathieu–Gauss beams Advanced Photonics Nexus
2023, 2(1): 016011
1 深圳大学 物理与光电工程学院 光电子器件与系统教育部重点实验室,广东 深圳 518060
2 深圳大学 广东省光纤传感技术粤港联合研究中心,广东 深圳 518060
在高速飞行器、航空发动机、核反应堆等**安全和国民经济的重要领域,需要实现1800 ℃以上的高温原位测量。常规石英光纤传感器受限于材料特性,无法在1000 ℃以上高温环境中长期稳定使用。单晶蓝宝石光纤具有极高的熔点(2053 ℃)和较低的传输损耗,是一种良好的高温传感材料。在单晶蓝宝石光纤内部刻写布拉格光栅,可以研制出蓝宝石光纤光栅传感器,具有耐温性能好、测量精度高、便于多点测量等优点,是当前最具发展前景的新型高温传感器件。首先介绍了蓝宝石光纤光栅高温传感器的工作原理和理论模型,接着介绍了利用飞秒激光制备蓝宝石光纤光栅的三种主流技术,包括相位掩模板扫描法、双光束干涉法、直写法,并从制备效率、光谱质量等方面比较了三种技术的优劣,指出飞秒激光直写法是制备蓝宝石光纤光栅高温传感器的最佳手段;然后介绍了蓝宝石光纤光栅的光谱优化方法,包括如何减小光栅光谱带宽和如何降低光谱噪声;进一步介绍了蓝宝石光纤光栅的高温传感特性、封装工艺及高温温度、应变传感应用;最后展望了蓝宝石光纤光栅传感器的未来发展趋势。蓝宝石光纤光栅高温传感器的快速发展和大规模推广应用,必将有助于解决当前我国航空航天、核电等领域重大装备结构健康监测的卡脖子难题。
高温传感器 蓝宝石光纤光栅 飞秒激光微加工 high-temperature sensor sapphire fiber Bragg grating femtosecond laser micromachining 红外与激光工程
2022, 51(10): 20220700
中北大学机械工程学院, 先进制造技术山西省重点实验室, 山西 太原 030051
为优化激光制备表面微坑织构工艺参数, 提高缸套-活塞环摩擦副的摩擦学性能, 使用纳秒脉冲激光器在镀铬活塞环表面制备椭圆形微坑织构, 探究激光功率、加工次数、扫描速度与填充线间距对微坑形貌及尺寸的影响。结果表明:增大激光功率与重复加工次数、降低扫描速度与填充线间距可有效提高微坑深度; 微坑长径长度随激光功率增大而减小, 随加工次数的增加先增加后减小, 扫描速度与填充线间距对其影响较小。当加工参数为激光功率9 W、重复扫描3次、扫描速度200 mm/s、填充线间距1 μm、激光重复频率30 kHz时, 可以在镀铬活塞环表面加工出长半径200 μm、短半径150 μm、深度为38 μm的目标微坑。研究结果为激光在活塞环表面制备微坑织构及改善摩擦副摩擦学性能的实际应用提供指导。
激光微加工 表面微坑 织构 工艺参数 laser micromachining surface pit texture process parameter
Author Affiliations
Abstract
1 Novosibirsk State University, Novosibirsk 630090, Russia
2 Institute of Automation and Electrometry of the SB RAS, Novosibirsk 630090, Russia
3 Department of Information, Electronics and Telecommunications Engineering, Sapienza University of Rome, Rome 00184, Italy
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In this article, we review recent advances in the technology of writing fiber Bragg gratings (FBGs) in selected cores of multicore fibers (MCFs) by using femtosecond laser pulses. The writing technology of such a key element as the FBG opens up wide opportunities for the creation of next generation fiber lasers and sensors based on MCFs. The advantages of the technology are shown by using the examples of 3D shape sensors, acoustic emission sensors with spatially multiplexed channels, as well as multicore fiber Raman lasers.
multicore fiber fiber Bragg grating femtosecond laser micromachining fiber laser fiber sensor Opto-Electronic Advances
2022, 5(4): 210055