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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

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

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

“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

1.7-μm dissipative soliton Tm-doped fiber laser

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Photonics Research 2021年第5期9卷 873-878页

作者： JI-XIANG CHEN XIANG-YUE LI TI-JIAN LI ZE-YU ZHAN MENG LIU CAN LI ai-ping luo PU ZHOU KENNETH K-YWONG 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 UniversityGuangzhou 510006China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina

We report on the dissipative soliton generation in a 1.7-μm net-normal dispersion Tm-doped fiber laser by nonlinear polarization rotation technique. An intra-cavity bandpass filter was employed to suppress the longwavelength emission, while the cavity dispersion was compensated by a segment of ultrahigh numerical aperture(UHNA4) fiber. The dissipative soliton with a central wavelength of 1746 nm was obtained, covering a spectral range from 1737 nm to 1754 nm. The de-chirped duration and energy of the dissipative soliton were 370 fs and 0.2 nJ, respectively. In addition, the dynamics of multiple dissipative solitons were also investigated. Through optimization of the cavity dispersion, the 50 nm broadband dissipative soliton with de-chirped pulse duration of 230 fs could be achieved. The development of dissipative soliton seed laser represents the first step in achieving the chirped pulse amplification system at the 1.7-μm wave band, which would find potential applications in fields such as biomedical imaging and material processing.

关键词： technique. soliton dissipative

The interaction between KIF21A and KANK1 regulates dendritic morphology and synapse plasticity in neurons

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Neural Regeneration Research 2025年第1期20卷 209-223页

作者： Shi-Yan Sun Lingyun Nie Jing Zhang Xue Fang Hongmei luo Chuanhai Fu Zhiyi Wei ai-Hui Tang Hefei National Research Center for Physical Sciences at the Microscale CAS Key Laboratory of Brain Function and DiseaseMinistry of Education Key Laboratory for Membrane-less Organelles and Cellular DynamicsDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui ProvinceChina Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefeiAnhui ProvinceChina CAS Center for Excellence in Molecular Cell Sciences Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui ProvinceChina Department of Neurobiology School of Life SciencesSouthern University of Science and TechnologyShenzhenGuangdong ProvinceChina Brain Research Center Southern University of Science and TechnologyShenzhenGuangdong ProvinceChina

Morphological alterations in dendritic spines have been linked to changes in functional communication between neurons that affect learning and ***-4 KIF21A helps organize the microtubule-actin network at the cell cortex by interacting with KANK1;however,whether KIF21A modulates dendritic structure and function in neurons remains *** this study,we found that KIF21A was distributed in a subset of dendritic spines,and that these KIF21A-positive spines were larger and more structurally plastic than KIF21A-negative ***,the interaction between KIF21A and KANK1 was found to be critical for dendritic spine morphogenesis and synaptic *** of either KIF21A or KANK1 inhibited dendritic spine morphogenesis and dendritic branching,and these deficits were fully rescued by coexpressing full-length KIF21A or KANK1,but not by proteins with mutations disrupting direct binding between KIF21A and KANK1 or binding between KANK1 and *** down KIF21A in the hippocampus of rats inhibited the amplitudes of long-term potentiation induced by high-frequency stimulation and negatively impacted the animals’cognitive *** together,our findings demonstrate the function of KIF21A in modulating spine morphology and provide insight into its role in synaptic function.

关键词： actin cytoskeleton dendrite KANK1 KIF21A microtubule spine morphology spine synaptic plasticity talin1

Turbo编码DS/CDMA系统中的迭代多用户接收器

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通信学报 2002年第10期23卷 59-65页

作者：张爱萍罗汉文王豪行上海交通大学电子工程系上海200030

本文提出了一种用于Turbo编码DS/CDMA系统的迭代多用户接收器。该接收器由一个软输入/软输出(SISO)的多用户检测器和一组单用户SISO信道译码器组成。每次迭代过程中,多用户检测器和信道译码器都输出外信息作为下一次迭代的先验信息。仿... 详细信息

本文提出了一种用于Turbo编码DS/CDMA系统的迭代多用户接收器。该接收器由一个软输入/软输出(SISO)的多用户检测器和一组单用户SISO信道译码器组成。每次迭代过程中,多用户检测器和信道译码器都输出外信息作为下一次迭代的先验信息。仿真结果表明,这种接收器的比特误码性能接近Turbo编码系统的单用户限。

关键词： Turbo编码 DS/CDMA 迭代多用户接收器直接序列码分多址多用户检测迭代处理

微小单孔VATS治疗原发自发性气胸患者的效果及优势分析

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临床肺科杂志 2017年第6期22卷 1029-1032页

作者：朱爱萍罗斌罗卫民十堰市太和医院湖北十堰442000

目的探讨原发自发性气胸患者采用微小单孔电视辅助胸腔镜治疗的效果及临床优势。方法选取2014年1月-2015年6月在本院选择手术治疗的94例原发自发性气胸进行回顾性分析,其中44例患者采用微小单孔VATS手术治疗(单孔组)、50例患者采用传统V... 详细信息

目的探讨原发自发性气胸患者采用微小单孔电视辅助胸腔镜治疗的效果及临床优势。方法选取2014年1月-2015年6月在本院选择手术治疗的94例原发自发性气胸进行回顾性分析,其中44例患者采用微小单孔VATS手术治疗(单孔组)、50例患者采用传统VATS手术方法治疗(传统组),对比两组患者的手术指标、术后血清相关指标。结果单孔组引流管留置时间、手术出血量、手术后引流量及患者的住院时间均低于传统组(P0.05);单孔组患者的术后疼痛程度显著的低于传统组,差异具有统计学意义(P0.05);术后24h,单孔组血清TNF-α、IL-1、α1-AT水平低于传统组,差异具有统计学意义(P<0.05)。结论微小单孔VATS手术治疗原发自发性气胸手术效果可靠,同时具有术后恢复快、创伤程度小的优势。

关键词：微小单孔电视辅助胸腔镜自发性气胸