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High performance visible generation of Ho^(3+)-doped all-fiber lasers

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Photonics Research 2023年第12期11卷 2121-2127页

作者： SHUAIHAO JI XUEXIAN LIN BO XIAO ZHONGYU WANG XIUJI LIN zhiping cai Department of Electronic Engineering School of Electronic Science and Engineering(National Model Microelectronics College)XiamenUniversityXiamen 361005China

Direct generation of visible frequency from a compact all-fiber laser while preserving high output characteristics has been a subject of research in laser *** investigated the high output performance of all-fiber lasers based on Ho^(3+)-doped ZBLAN fluoride glass fiber especially operating in the deep-red band by pumping at 640 ***,we achieved a maximum continuous-wave output power of 271 m W at 750 nm with a slope efficiency of 45.1%,which represents,to our knowledge,the highest direct output power recorded in an all-fiber laser with a core diameter of less than 10μm in the deep-red ***,we successfully developed a 1.2μm all-fiber laser pumped by a 640 nm *** extensively investigated the correlation between these two-laser generation processes and their performances at 750 nm and 1.2μm *** increasing the pumping rate,we observed an efficient recycling of population through a highly excited state absorption process,which effectively returned the population to the upper laser level of the deep-red ***,we determined the optimized conditions for such lasers,identified the processes responsible for populating the excited state energy levels,and established the corresponding spectroscopic parameters.

关键词： fiber pumping lasers

应用人体解剖学软件进行线上实验教学的效果观察

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继续医学教育 2024年第2期38卷 69-72页

作者：蔡志平丛薇张柏峰王晓露王向前郝广煜包头医学院基础医学与法医学院内蒙古包头014040 内蒙古医科大学人体解剖学实验室内蒙古呼和浩特010107 郑州国之正生物科技有限公司技术部河南郑州450001 包头医学院计算机科学与技术学院内蒙古包头014040

目的研究在线教学中应用人体解剖学教学软件的教学效果及体会。方法选取2021年9月至2022年12月包头医学院2020级和2021级医学法学、医学信息管理、医学英语、医学公共事业管理、医学营销专业的学生进行人体解剖学理论与实验课教学。202... 详细信息

目的研究在线教学中应用人体解剖学教学软件的教学效果及体会。方法选取2021年9月至2022年12月包头医学院2020级和2021级医学法学、医学信息管理、医学英语、医学公共事业管理、医学营销专业的学生进行人体解剖学理论与实验课教学。2020级全体学生在教学过程中采用传统实验和理论讲授的教学方法作为对照组,2021级全体学生在教学过程中采用郑州国希望云解剖三维实物教学软件作为观察组;对2组学生的入学成绩、学生期末总成绩以及期末考试中运动系统、神经系统得分情况进行统计和比较,对实验课学习效果设计评分问卷,在学生实验课后发放问卷、收集问卷和反馈结果,对问卷结果进行整理分析。结果观察组实验课学习效果评价为优、良和尚可、差的学生和对照组相比,差异无统计学意义(P>0.05)。2组学生的期末考试成绩,对照组学生得分为(61.77±9.56)分、观察组得分为(85.08±11.05)分,观察组学生的成绩高于对照组,差异有统计学意义(P<0.001);观察组学生的运动系统得分为(18.48±2.47)分,普遍低于对照组学生的(23.79±3.66)分,差异有统计学意义(P<0.001);观察组学生的神经系统得分为(23.45±3.54)分,对照组学生的神经系统得分为(19.79±3.63)分,观察组学生得分高于对照组,差异有统计学意义(P<0.05)。结论采用线上教学软件,学生期末总成绩优于传统的实验教学,人体解剖学中神经系统的教学效果要优于传统的线下教学模式。

关键词：人体解剖学教学计算机软件线上教学传统教学效果

Direct generation of an ultrafast vortex beam in a CVD-graphene-based passively mode-locked Pr:LiYF4 visible laser

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Photonics Research 2019年第11期7卷 1209-1213页

作者： Nan Li Junjie Huang Bin Xu Yaqi cai Jie Lu Linjie Zhan Zhengqian Luo Huiying Xu zhiping cai Weiwei cai Department of Electronic Engineering Xiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518057China Department of Physics State Key Laboratory of Physical Chemistry of Solid SurfacesXiamen UniversityXiamen 361005China

We report on the direct generation of passively mode-locked vortex lasers in the visible spectral region, for the first time to the best of our knowledge, using a Pr :Li YF4(Pr:YLF) crystal as the gain medium. A stable mode-locked TEM00 mode has been achieved with a maximum average output power of 75 m W using a graphene saturable absorber mirror. The mode-locked pulse width is measured to be as short as about 73.4 ps at a repetition rate of about 140 MHz, and the laser wavelength is at about 721 nm with spectral width of about 0.5 nm. By slightly misaligning the laser resonator, a first-order Laguerre-Gaussian mode(LG0,1) has also been obtained with output power reduced to about 22 m W. The achieved LG0,1 mode has been verified via a home made improved Fizeau interferometer. This work provides a simple and universal method for direct generation of an ultrafast vortex laser,which can be readily extended to other spectral regions by using different laser gain mediums.

关键词： passive interferometer resonator

Diode-pumped high-power continuous-wave intracavity frequency-doubled Pr^(3+):YLF ultraviolet lasers around 349 nm

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High Power Laser Science and Engineering 2023年第1期11卷 44-51页

作者： Xiuji Lin Zheng Zhang Shuaihao Ji Run Fang Bo Xiao Huiying Xu zhiping cai Department of Electronic Engineering Xiamen UniversityXiamenChina

High-power continuous-wave ultraviolet lasers are useful for many *** ultraviolet laser sources,the wavelength switching capability and compact structure are very important to extend the applicability and improve the flexibility in practical *** this work,we present two simple and relatively compact schemes by laser diode pumping to obtain a watt-level single-wavelength 348.7-nm laser and discrete wavelength tunable ultraviolet lasers around 349 nm(from 334.7 to 364.5 nm)by intracavity frequency doubling based on Pr^(3+):YLF andβ-BBO *** maximum output power of the single-wavelength 348.7-nm laser is 1.033 *** output powers of the discrete wavelength tunable lasers are at the level of tens of milliwatts,except for two peaks at 348.7 and 360.3 nm with output powers of approximately 500 *** addition,simulations are carried out to explain the experimental results and clarify the tuning mechanisms.

关键词： high-power ultraviolet laser Pr^(3+):YLF tunable ultraviolet laser

Mid‐infrared all‐fiber gain‐switched pulsed laser at 3μm

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Opto-Electronic Advances 2020年第5期3卷 1-10页

作者： Xiaojin Zhang Weiwei Li Jin Li Huiying Xu zhiping cai Zhengqian Luo Department of Electronic Engineering Xiamen UniversityXiamen 361005China

Mid-infrared(MIR)fiber pulsed lasers are of tremendous application interest in eye-safe LIDAR,spectroscopy,chemical detection and *** far,these MIR lasers largely required bulk optical elements,complex free-space light alignment and large footprint,precluding compact all-fiber ***,we proposed and demonstrated an all-fiberized structured gain-switched Ho3+-doped ZBLAN fiber laser operating around 2.9μm.A home-made 1146 nm Raman fiber pulsed laser was utilized to pump highly concentrated single-cladding Ho3+-doped ZBLAN fiber with different lengths of 2 m or 0.25 m.A home-made MIR fiber mirror and a perpendicular-polished ZBLAN fiber end construct the all-fiberized MIR *** gain-switched multiple states with a sub-pulse number tuned from 1 to 8 were *** effects of gain fiber length,pump power,pump repetition rate and output coupling ratio on performance of gain-switched pulses were further investigated in *** shortest pulse duration of 283 ns was attained with 10 kHz repetition *** pulsed laser,centered at 2.92μm,had a maximum average output power of 54.2 mW and a slope efficiency of 10.12%.It is,to the best of our knowledge,the first time to demonstrate a mid-infrared gain-switched Ho3+:ZBLAN fiber laser with compact all-fiber structure.

关键词： fiber laser mid-infrared gain-switching

Passively Q-switched green laser operation using CdTe/CdS quantum dots

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Chinese Optics Letters 2018年第2期16卷 47-51页

作者： Xigun Yan Saiyu Luo Bin Xu Huiying Xu zhiping cai Zingzhou Li Hongxing Dong Long Zhang Zhengqian Luo Department of Electronic Engineering Xiamen UniversityXiamen 361005China Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of ScienceShanghai 201800China Shenzhen Research Institute of Xiamen University Shenzhen 518057China

The direct generation of passively Q-switched lasers at a green wavelength has rarely been investigated in the *** this Letter,we demonstrate a passively Q-switched praseodymium-doped yttrium lithium fluoride green laser at 522 nm using CdTe/CdS quantum dots as a saturable absorber.A maximum average output power of 33.6 m W is achieved with the shortest pulse width of 840 *** corresponding pulse energy and peak power reached 0.18μJ and 0.21 W,*** the best of our knowledge,this is the first demonstration in regard to a quantum dots saturable absorber operating in the green spectral region.

关键词： Green lasers Laser operation Laser sources Q switched lasers Quantum dots Saturable absorbers

Visible Raman and Brillouin lasers from a microresonator/ZBLAN-fiber hybrid system

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Photonics Research 2019年第5期7卷 566-572页

作者： SHUISEN JIANG CHANGLEI GUO KAIJUN CHE ZHENGQIAN LUO TUANJIE DU HONGYAN FU HUIYING XU zhiping cai Department of Electronic Engineering Xiamen University

Raman and Brillouin lasers based on a high-quality(high-Q) whispering gallery mode microresonator(WGMR)are usually achieved by employing a tunable single-frequency laser as a pump source. Here, we experimentally demonstrate visible Raman and Brillouin lasers using a compact microresonator/ZrF4-BaF2-LaF3-AlF3-NaF(ZBLAN)-fiber hybrid system by incorporating a WGMR with a fiber-compatible distributed Bragg reflector/fiber Bragg grating to form a Fabry–Perot(F-P) fiber cavity and using a piece of Pr:ZBLAN fiber as gain *** high-Q silica-microsphere not only offers a Rayleigh-scattering-induced backreflection to form the ~635 nm red laser oscillation in the F-P fiber cavity, but also provides a nonlinear gain in the WGMR itself to generate either stimulated Raman scattering or stimulated Brillouin scattering. Up to six-order cascaded Raman lasers at0.65 μm, 0.67 μm, 0.69 μm, 0.71 μm, 0.73 μm, and 0.76 μm are achieved, respectively. Moreover, a Brillouin laser at 635.54 nm is clearly observed. This is, to the best of our knowledge, the first demonstration of visible microresonator-based lasers created by combining a Pr:ZBLAN fiber. This structure can effectively extend the laser wavelength in the WGMR to the visible waveband and may find potential applications in underwater communication, biomedical diagnosis, microwave generation, and spectroscopy.

关键词： Visible Raman Brillouin lasers ZBLAN-fiber hybrid system

A Survey on Security Threats and Solutions of Bitcoin

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Journal of Cyber Security 2021年第1期3卷 29-44页

作者： Le Lai Tongqing Zhou zhiping cai Zhiyao Liang Hao Bai National University of Defense Technology Changsha410073China Macao University of Science and Technology 999078Macao

Bitcoin is known as the first decentralized digital currency around the *** uses blockchain technology to store transaction data in a distributed public ledger,is a distributed ledger that removes third-party trust *** its invention,bitcoin has achieved great success,has a market value of about$200 ***,while bitcoin has brought a wide and far-reaching impact in the financial field,it has also exposed some security problems,such as selfish mining attacks,Sybil attack,eclipse attacks,routing attacks,EREBUS attacks,and so *** paper gives a comprehensive overview of various attack scenarios that the bitcoin network may be subjected to,and the methods used to implement the attacks,and reviews the solutions and countermeasures proposed against these ***,we summarized other security challenges and proposed further optimizations for the security of the bitcoin network.

关键词： Bitcoin blockchain security attack P2P network

Diode-pumped wavelength-switchable visible Pr^(3+):YLF laser and vortex laser around 670 nm

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Opto-Electronic Advances 2021年第4期4卷 27-34页

作者： Xiuji Lin Qichen Feng Yao Zhu Shuaihao Ji Bo Xiao Huiying Xu Wensong Li zhiping cai Department of Electronic Engineering School of Electronic Science and Engineering(National Model Microelectronics College)Xiamen UniversityXiamen 361005China

Here we developed a novel wavelength-switchable visible continuous-wave(CW)Pr^(3+):YLF laser around 670 *** single-wavelength laser operations,the maximum output powers of 2.60 W,1.26 W,and 0.21 W,the maximum slope efficiencies of 34.7%,27.3%,and 12.3%were achieved with good beam qualities(M^(2)<1.6)at 670.4 nm,674.2 nm,and 678.9 nm,***-high output power(2.6 W)and record-high slope efficiency(34.7%)were achieved for the Pr^(3+):YLF laser operation at 670.4 *** is also the first demonstration of longer-wavelength peaks beyond 670 nm in the^(3)P_(1)→^(3)F_(3)transition of Pr^(3+):*** multi-wavelength laser operations,the dual-wavelength lasings,including 670.1/674.8 nm,670.1/679.1 nm,and 675.0/679.4 nm,were obtained by fine adjustment of one/two etalons within the ***,the triple-wavelength lasings,e.g.672.2/674.2/678.6 nm and 670.4/674.8/679.4 nm,were successfully ***,both the first-order vortex lasers(LG_(0)^(+1)and LG_(0)^(-1)modes)at 670.4 nm were obtained by off-axis pumping.

关键词： high-power laser visible laser switchable laser deep-red laser