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Graphene-decorated microfiber knot as a broadband resonator for ultrahigh-repetition-rate pulse fiber lasers

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Photonics Research 2018年第10期6卷 I0003-I0009页

作者： MENG Liu RUI TANG AI-PING Luo wen-cheng xu ZHI-CHAO LUO Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices & Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications South China Normal University Guangzhou 510006 China Guangdong Provincial Engineenng Technology Research Center for Microstructured Functional Fibers and Devices South China Normal University Guangzhou 510006 China

Searching for an ultrahigh-repetition-rate pulse on the order of hundreds of gigahertz(GHz) is still a challenging task in the ultrafast laser community. Recently, high-quality silicon/silica-based resonators were exploited to generate a high-repetition-rate pulse based on the filter-driven four-wave mixing effect in fiber lasers. However,despite their great performance, the silicon/silica-based resonators still have some drawbacks, such as single waveband operation and low coupling efficiency between the fiber and resonators. To overcome these drawbacks,herein we proposed an all-fiber broadband resonator fabricated by depositing the graphene onto a microfiber knot. As a proof-of-concept experiment, the graphene-deposited broadband microfiber knot resonator(MKR)was applied to Er-and Yb-doped fiber lasers operating at two different wavebands, respectively, to efficiently generate hundreds-of-GHz-repetition-rate pulses. Such a graphene-deposited broadband MKR could open some new applications in ultrafast laser technology, broadband optical frequency comb generation, and other related fields of photonics.

关键词：重复频率脉冲激光技术发展现状通讯技术

Q-switched mode-locked multimode fiber laser based on a graphene-deposited multimode microfiber

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Chinese Optics Letters 2021年第12期19卷 32-38页

作者： Jia-wen Wu Yu-Xin Gao xu-Bin Lin Jin-Gan Long Hu Cui Zhi-Chao Luo wen-cheng xu Ai-Ping Luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou 510006China Department of Mechanical and Electrical Engineering Shandong Polytechnic CollegeJining 272067China

We report Q-switched mode-locked(QML)pulses generation in an Yb-doped multimode fiber(MMF)laser by using a graphene-deposited multimode microfiber(GMM)for the first time,to the best of our *** single-wavelength QML operation with the central wavelength tunable from 1028.81 nm to 1039.20 nm and the dual-wavelength QML operation with the wavelength spacing tunable from 0.93 nm to 5.79 nm are achieved due to the multimode interference filtering effect induced by the few-mode fiber and MMF structure and the GMM in the ***,in the single-wavelength QML operation,the fifth harmonic is also realized owing to the high nonlinear effect of the *** obtained results indicate that the QML pulses can be generated in the MMF laser,and such a flexible tunable laser has promising applications in optical sensing,measuring,and laser processing.

关键词： Q-switched mode-locked pulse graphene-deposited multimode microfiber multimode fiber laser

Generation and manipulation of bright spatial bound-soliton pairs under the diffusion effect in photovoltaic photorefractive crystals

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Chinese Physics B 2020年第10期29卷 282-288页

作者： Ze-Xian Zhang Xiao-Yang Zhao Ye Li Hu Cui Zhi-Chao Luo wen-cheng xu Ai-Ping Luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices&Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications South China Normal UniversityGuangzhou 510006China

The generation and propagation characteristics of bright spatial bound-soliton pairs (BSPs) are investigated under the diffusion effect in photovoltaic photorefractive crystals by numerical simulation. The results show that two coherent solitons, one as the signal light and the other as the control light, can form a BSP when the peak intensity of the control light is appropriately selected. Moreover, under the diffusion effect, the BSP experiences a self-bending process during propagating and the center of the BSP moves on a parabolic trajectory. Furthermore, the lateral shift of the BSP at the output face of the crystal can be manipulated by adjusting the peak intensity of the control light. The research results provide a method for the design of all-optical switching and routing based on the manipulation of the lateral position of BSPs.

关键词： solitons photovoltaic photorefractive diffusion effect

“Periodic”soliton explosions in a dual-wavelength mode-locked Yb-doped fiber laser

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Photonics Research 2020年第3期8卷 246-251页

作者： MENG LIU TI-JIAN LI AI-PING LUO wen-cheng xu ZHI-CHAO LUO Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications&Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South ChinaNormal UniversityGuangzhou 510006China

We report the"periodic"soliton explosions induced by intracavity soliton collisions in a dual-wavelength modelocked Yb-doped fiber *** to the different group velocities of the two wavelengths,the mode-locked solitons centered at different wavelengths would periodically collide with each *** using the dispersive Fourier transformation technique,it was found that each collision would induce soliton explosions,but none of them would be ***,this phenomenon was termed as"periodic"soliton *** addition,the dissipative rogue waves were detected in the dual-wavelength mode-locked *** experimental results would be fruitful to the communities interested in soliton dynamics and dual-comb lasers.

关键词： fiber soliton mode

Few-layer MoS2-deposited microfiber as highly nonlinear photonic device for pulse shaping in a fiber laser [Invited]

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Photonics Research 2015年第2期3卷 69-78页

作者： Ai-Ping Luo Meng Liu xu-De Wang Qiu-Yi Ning wen-cheng xu Zhi-Chao Luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University

Two-dimensional（2D） materials have emerged as attractive mediums for fabricating versatile optoelectronic devices. Recently, few-layer molybdenum disulfide（MoS2）, as a shining 2D material, has been discovered to possess both the saturable absorption effect and large nonlinear refractive index. Herein, taking advantage of the unique nonlinear optical properties of MoS2, we fabricated a highly nonlinear saturable absorption photonic device by depositing the few-layer MoS2 onto the microfiber. With the proposed MoS2 photonic device, apart from the conventional soliton patterns, the mode-locked pulses could be shaped into some new soliton patterns, namely,multiple soliton molecules, localized chaotic multipulses, and double-scale soliton clusters. Our findings indicate that the few-layer MoS2-deposited microfiber could operate as a promising highlynonlinear photonic device for the related nonlinear optics applications.

关键词： high Mo mode Few-layer MoS2-deposited microfiber as highly nonlinear photonic device for pulse shaping in a fiber laser

新型聚能装药爆炸成型杆式射流数值模拟及试验研究

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北京理工大学学报 2017年第6期37卷 579-583,589页

作者：徐文龙王成徐斌胡平北京理工大学爆炸科学与技术国家重点实验室北京100081

为解决杆式射流炸药能量利用率低、速度小等缺点,提出了一种新型高速杆式聚能装药结构,基于Autodyn软件分析了高速杆式射流的形成过程,给出了药型罩及附加装置截顶高度对杆式射流成型的影响,优化出了射流速度高、速度梯度小的杆式聚能... 详细信息

为解决杆式射流炸药能量利用率低、速度小等缺点,提出了一种新型高速杆式聚能装药结构,基于Autodyn软件分析了高速杆式射流的形成过程,给出了药型罩及附加装置截顶高度对杆式射流成型的影响,优化出了射流速度高、速度梯度小的杆式聚能装药结构并进行了试验验证,试验结果与数值模拟结果基本一致,表明采用的计算方法、材料模型及相关参数是合理的,验证了数值模拟的正确性,对进一步优化高速杆式射流设计具有一定的借鉴意义.

关键词：杆式射流数值模拟成型侵彻力学

Tailoring Light–Matter Interactions in Overcoupled Resonator for Biomolecule Recognition and Detection

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Nano-Micro Letters 2025年第1期17卷 262-280页

作者： Dongxiao Li Hong Zhou Zhihao Ren cheng xu chengkuo Lee Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Center for Intelligent Sensors and MEMS(CISM) National University of SingaporeSingapore 117608Singapore

Plasmonic nanoantennas provide unique opportunities for precise control of light–matter coupling in surface-enhanced infrared absorption(SEIRA)spectroscopy,but most of the resonant systems realized so far suffer from the obstacles of low sensitivity,narrow bandwidth,and asymmetric Fano resonance ***,we demonstrated an overcoupled resonator with a high plasmon-molecule coupling coefficient(μ)(OC-Hμresonator)by precisely controlling the radiation loss channel,the resonator-oscillator coupling channel,and the frequency detuning *** observed a strong dependence of the sensing performance on the coupling state,and demonstrated that OC-Hμresonator has excellent sensing properties of ultra-sensitive(7.25%nm^(−1)),ultra-broadband(3–10μm),and immune asymmetric Fano *** characteristics represent a breakthrough in SEIRA technology and lay the foundation for specific recognition of biomolecules,trace detection,and protein secondary structure analysis using a single array(array size is 100×100μm^(2)).In addition,with the assistance of machine learning,mixture classification,concentration prediction and spectral reconstruction were achieved with the highest accuracy of 100%.Finally,we demonstrated the potential of OC-Hμresonator for SARS-CoV-2 *** findings will promote the wider application of SEIRA technology,while providing new ideas for other enhanced spectroscopy technologies,quantum photonics and studying light–matter interactions.

关键词： Plasmonic nanoantennas Light-matter interaction Surface-enhanced infrared absorption Overcoupled Biosensing

Clinical experience of airway management and tracheal intubation under general anesthesia in patients with scar contracture of the neck

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Chinese Medical Journal 2008年第11期121卷 989-997页

作者： xuE Fu-shan LIAO xu LI cheng-wen xu Ya-chao YANG Quan-yong LIU Yi LIU Jian-hua LUO Mao-ping ZHANG Yan-ming Department of Anesthesiology Plastic Surgery Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing i00041 China

Background Because patients with scar contracture of the neck are at a high risk of loss of the airway control after anesthesia induction, awake intubation is usually recommended. This retrospective clinical study was designed to evaluate the possibility, safety and efficacy of airway management and tracheal intubation under general anesthesia in such patients. Methods This retrospective study included 1683 patients from January 1994 to December 2006 with scar contracture of the neck, aged 1.5--67.0 years, who were scheduled for elective plastic surgery under general anesthesia in Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College. Based on the results of the preoperative airway assessment, the patients were classified into group 1 （including 1375 patients with the atlanto-occipital extension of 〉20° and the Mallampatti＇s grade I or II） and group 2 （containing 308 patients with the atlanto-occipital extension of 〈20° and the Mallampatti＇s grade III or IV. In group 1, the intravenous induction and maintenance of anesthesia and succinylcholine for muscle relaxation were used. The intubation was done using a modified Macintosh technique. In group 2, the total intravenous anesthesia （TIVA） or the sevoflurane inhalation anesthesia was chosen and the spontaneous breathing was reserved during anesthesia. The intubation was performed by a fiberoptic stylet laryngoscope （FOSL）. The number of intubation attempts, intubation time and relative complications were observed and recorded in all patients. Results In group 1, the intubation was accomplished during the first attempt in 1279 cases （93%） and the intubation time was 〈3 minutes in 1304 cases （95%）. In group 2, the intubation was completed by the first attempt in 114 patients （37%） and 123 patients had an intubation time of 〈3 minutes （40%）. Tracheal intubation was successful by the second or third attempt in 96 patients in group 1 and 156 patients in group 2. Thirty-eight pa

关键词： scar contracture of the neck limitation of head extension difficult intubation airway management general anesthesia

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电致发光衰减测量系统的搭建及应用

光谱学与光谱分析 2017年第7期37卷 1993-1996页

作者：陈毅翔赵谡玲徐征张成文徐叙北京交通大学发光与光信息技术教育部重点实验室光电子技术研究所北京100044

发光衰减是发光的重要过程,测量发光寿命对研究发光机理十分重要,但传统研究在概念和方法上存在两个差错:(1)概念上认为衰减等同于激发态数目的减少,而忽视了衰减是发光强度的下降,两者是不同的概念;(2)方法上基于激发态规律推导,假设... 详细信息

发光衰减是发光的重要过程,测量发光寿命对研究发光机理十分重要,但传统研究在概念和方法上存在两个差错:(1)概念上认为衰减等同于激发态数目的减少,而忽视了衰减是发光强度的下降,两者是不同的概念;(2)方法上基于激发态规律推导,假设的边界条件不符合实际,没有实验的支持。同时,传统方法对设备的要求很高,且只限于光致发光。为了纠正差错,降低成本,搭建了一套全新的电致发光衰减测量系统,可用于所有可以周期激发的发光类型。从能量转换原理出发,采用周期激发,用脉冲间隔时间作为时间尺度来度量发光衰减持续的时间,通过脉冲间隔时间与发光寿命的对比,相应地发光强度有不同的变化,根据该现象简便地测量出发光寿命。基于该原理搭建的发光衰减测量系统,实验结果表明了发光强度随着激发频率,先保持不变然后逐渐下降,通过测量下折点即能够推算出发光衰减寿命,而且还发现发光衰减寿命与初始发光强度呈正相关的关系。认为发光寿命是发光强度的变化,是区别于传统研究以激发态数目为研究对象的一大创新,同时通过实验证明了发光寿命与初始亮度相关,也拓展了对发光寿命的新认识。

关键词：发光衰减发光寿命电致发光