肖虎 1,2潘志勇 1,2陈子伦 1,2马鹏飞 1,2[ ... ]陈金宝 1,2,*
作者单位
摘要
1 国防科学技术大学 前沿交叉学科学院,长沙 410073
2 国防科技大学 南湖之光实验室,长沙 410073
锥形光纤能够有效兼顾非线性效应抑制和模式控制,具备实现高功率、高光束质量光纤激光的潜力。近期国防科技大学研制了锥形掺镱光纤,采用1018 nm光纤激光后向级联泵浦实现了20.2 kW 激光输出,光束质量β因子平均值优于2,拉曼抑制比为33 dB。研究结果展示了锥形光纤在实现万瓦级高光束质量激光方面的优势。
光纤激光器 级联泵浦 锥形光纤 光束质量 fiber laser tandem pump tapered fiber beam quality 
强激光与粒子束
2024, 36(1): 011001
Hengtian Zhu 1†Junxian Luo 2†Qing Dai 3†Shugeng Zhu 1[ ... ]Fei Xu 1,*
Author Affiliations
Abstract
1 College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China
2 School of Physics, Nanjing University, Nanjing 210023, China
3 Department of Cardiology, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
Systemic blood circulation is one of life activity’s most important physiological functions. Continuous noninvasive hemodynamic monitoring is essential for the management of cardiovascular status. However, it is difficult to achieve systemic hemodynamic monitoring with the daily use of current devices due to the lack of multichannel and time-synchronized operation capability over the whole body. Here, we utilize a soft microfiber Bragg grating group to monitor spatiotemporal hemodynamics by taking advantage of the high sensitivity, electromagnetic immunity, and great temporal synchronization between multiple remote sensor nodes. A continuous systemic hemodynamic measurement technique is developed using all-mechanical physiological signals, such as ballistocardiogram signals and pulse waves, to illustrate the actual mechanical process of blood circulation. Multiple hemodynamic parameters, such as systemic pulse transit time, heart rate, blood pressure, and peripheral resistance, are monitored using skin-like microfiber Bragg grating patches conformally attached at different body locations. Relying on the soft microfiber Bragg grating group, the spatiotemporal hemodynamic monitoring technique opens up new possibilities in clinical medical diagnosis and daily health management.
spatiotemporal hemodynamic monitor skin-like photonic devices microfiber Bragg grating 
Opto-Electronic Advances
2023, 6(11): 230018
肖虎 1,2李瑞显 1,2吴函烁 1,2黄良金 1,2[ ... ]陈金宝 1,2,***
作者单位
摘要
1 国防科技大学前沿交叉学科学院,湖南 长沙 410073
2 国防科技大学南湖之光实验室,湖南 长沙 410073
级联泵浦方案具有泵浦光亮度高、量子亏损小、光纤热负荷低、模式不稳定阈值高等优势,是获得高功率光纤激光的主要技术方案。目前,万瓦级高光束质量光纤激光的实现在非线性效应抑制和模式控制等方面遇到困难。本文介绍了国防科技大学近年来在高光束质量级联泵浦光纤激光器方面的研究进展,并对功率和光束质量进一步提升的可行途径进行了分析。
高功率光纤激光器 级联泵浦 受激拉曼散射 光束质量 
光学学报
2023, 43(17): 1714009
作者单位
摘要
1 深圳技术大学中德智能制造学院,广东 深圳 518118
2 温州大学机电工程学院,浙江 温州 325200
3 浙江大学机械工程学院,流体动力与机电系统国家重点实验室,浙江 杭州 310027
Overview: Surface-enhanced Raman scattering (SERS) affords a rapid, highly sensitive, and nondestructive approach for label-free and fingerprint diagnosis of a wide range of chemicals. This technique has been applied in explosives detection, pre-cancer diagnosis, food safety, and forensic analysis, where a small number of hazardous substances can seriously affect health of human beings. Thus, it is of great significance to prepare high-performance SERS sensors. In general, the signal intensity of SERS is determined by the following three factors: 1) The enhancement effect of surface nanostructure on local electric fields; 2) The number of molecules to be detected in hot spots; 3) Performance of the Raman spectrometer. Therefore, in order to achieve high-performance SERS detection of trace molecules, current research focuses on how to increase the density of hot spots and the number of analyte molecules in the detection area. An ultrafast laser has an ultra-short pulse width and ultra-high peak power, so it can interact with the majority of materials with high processing accuracy and excellent controllability. Meanwhile, it can rapidly construct a variety of large-area micro/nano-structures on material surfaces based on facile digital programming strategies. In addition, combined with multi-beam parallel fast scanning technology, low-cost and high-efficiency machining can be realized without a special requirement for the machining environment. Based on the above advantages, the ultrafast laser has become one of the important means for the fabrication of micro/nano-structures. This is important for the commercial preparation of high-performance SERS sensors. In this paper, we focus on two aspects to introduce the ultrafast laser preparation of high-performance SERS sensors, including how to increase the density of hot spots and the number of analyte molecules in the detection region. Ultrafast lasers can prepare micro/nano-structures with local field enhancement effects by both "bottom-up" and "top-down" processing strategies. The first is based on the "bottom-up" principle, where the reduction, deposition or polymerization of atoms, molecules or other nanoparticles is controlled by ultrafast lasers to achieve additive manufacturing of micro/nano-structures. The other is based on the "top-down" principle, where materials are removed by the ultrafast laser ablation to rapidly achieve hierarchical micro/nanostructures. These structures provide abundant active hot spots for SERS detection. In particular, the superhydrophobic surfaces prepared by the ultrafast laser are one of the most effective methods to achieve the enrichment of analyte molecules. Raman scattering can be excited more effectively by enriched molecules, which is conducive to obtaining higher detection limits and realizing ultra-trace detection. Finally, a prospect for the development of laser-prepared SERS substrates is provided.
超快激光加工 拉曼光谱 表面增强拉曼散射 微纳结构 ultrafast laser fabrication Raman spectroscopy surface-enhanced Raman scattering micro/nano-structures 
光电工程
2023, 50(3): 220333
周凯 1,2杨灿 1,2杨焕 1,2郑俊健 2[ ... ]李春波 1,2,*
作者单位
摘要
1 深圳技术大学先进光学精密制造技术广东普通高校重点实验室,广东 深圳 518118
2 深圳技术大学中德智能制造学院,广东 深圳 518118
研究了激光工艺参数的波动对钛合金表面着色稳定性的影响,以及不同激光工艺参数下钛合金表面色块的微观形貌和元素组分。在钛合金表面制备了橙、金、蓝、绿、紫等5种颜色的色块,通过重复实验获得各种成色稳定的色块对应的扫描速度、功率和线间距,实现了在20 J/cm2左右的较低激光能量密度下,在钛合金上获得欧几里得距离?Eab*<7的稳定颜色。分析了激光工艺参数在等量或等比变化下的成色稳定性,结果表明,在间隔为1 μm的线间距扰动下,?Eab*值的波动最大,不利于稳定成色。从样本的微观形貌、结构、元素组分等方面分析了不同色块的微观结构和元素组分差异,结果表明,激光作用后,样本表面分别形成了裂纹状、团块状有明显差异的两种微结构,且氧、碳元素含量区别明显。激光诱导钛合金表面着色是激光作用于材料表面形成的热效应导致的材料升温与表面钛氧化物形成共同作用的结果。
激光技术 激光着色 钛合金 工艺参数 纳秒激光 着色机理 
中国激光
2023, 50(8): 0802208
奚小明 1,2杨保来 1,2张汉伟 1,2潘志勇 1,2[ ... ]许晓军 1,2
作者单位
摘要
1 国防科技大学 前沿交叉学科学院,长沙 410073
2 国防科技大学 南湖之光实验室,长沙 410073
高功率光纤激光器具有高效率、小体积、低成本、抗回光能力强等突出优点,在工业加工等应用领域中具有明显的竞争优势。近期,国防科技大学基于光纤耦合半导体激光器(LD)直接泵浦的主振荡功率放大器(MOPA)实现了单纤20.27 kW的功率输出。放大器采用纯后向泵浦方案,中心波长1080 nm,光光效率达到84.8%,拉曼散射抑制比大于50 dB。通过优化光纤和器件的设计,可进一步提升激光器的功率和光束质量。
光纤激光器 光纤放大器 半导体激光器 后向泵浦 fiber laser fiber amplifier laser diode backward pumping 
强激光与粒子束
2023, 35(2): 021001
Author Affiliations
Abstract
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
In this work, a confined-doped fiber with the core/inner-cladding diameter of 40/250 μm and a relative doping ratio of 0.75 is fabricated through a modified chemical vapor deposition method combined with the chelate gas deposition technique, and subsequently applied in a tandem-pumped fiber amplifier for high-power operation and transverse mode instability (TMI) mitigation. Notably, the impacts of the seed laser power and mode purity are preliminarily investigated through comparative experiments. It is found that the TMI threshold could be significantly affected by the seed laser mode purity. The possible mechanism behind this phenomenon is proposed and revealed through comprehensive comparative experiments and theoretical analysis. Finally, a maximum output power of 7.49 kW is obtained with the beam quality factor of approximately 1.83, which is the highest output power ever reported in a forward tandem-pumped confined-doped fiber amplifier. This work could provide a good reference and practical solution to improve the TMI threshold and realize high-power high-brightness fiber lasers.
confined-doped fiber fiber laser good beam quality high power transverse mode instability mitigation 
High Power Laser Science and Engineering
2022, 10(6): 06000e44
杨保来 1,2,3杨欢 1,2,3王鹏 1,2,3黄良金 1,2,3[ ... ]陈金宝 1,2,3
作者单位
摘要
1 国防科技大学前沿交叉学科学院,湖南 长沙 410073
2 国防科技大学南湖之光实验室,湖南 长沙 410073
3 脉冲功率激光技术国家重点实验室,湖南 长沙 410073
中国激光
2022, 49(20): 2016001
作者单位
摘要
国防科技大学 前沿交叉学科学院,长沙 410073
当前光纤激光功率提升受限于模式不稳定效应及非线性效应,为了克服上述功率提升限制因素,自主设计并研制了大模场部分掺杂光纤。最终,采用自研部分掺杂光纤及后向级联泵浦方案,成功实现了10.1 kW的光纤激光输出,对应的光束质量因子(M2)为2.16。
高功率 光纤激光 部分掺杂光纤 高光束质量 high power fiber laser confined-doped fiber good beam quality 
强激光与粒子束
2022, 34(11): 111002
作者单位
摘要
国防科技大学 前沿交叉学科学院,脉冲功率激光技术国家重点实验室,高能激光技术湖南省重点实验室,长沙 410073
高功率高光束质量光纤激光器在工业加工等领域有着广泛的应用,然而光纤中的非线性效应和模式不稳定效应限制着高光束质量光纤激光器的功率提升,采用新型结构大模场增益光纤在同时抑制非线性效应和模式不稳定效应方面具有较大潜力。报道了基于单位自研的纺锤形渐变掺镱光纤激光成功实现6 kW功率、高光束质量激光输出。激光器采用主振荡功率放大结构,放大级采用双向981 nm泵浦纺锤形渐变掺镱光纤,在总泵浦功率为7.68 kW时,输出功率达到6.02 kW,光束质量M2因子约为1.9。通过进一步优化纺锤形掺镱光纤制作工艺及结构参数,有望实现更高功率、近单模光束质量的光纤激光输出。
光纤放大器 高功率 锥形光纤 纺锤形渐变光纤 fiber amplifier high power tapered fiber gradually varying spindle-shaped fiber 
强激光与粒子束
2022, 34(8): 081001

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!