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Efficient improvement of 2.7 μm luminescence of Er^(3+):oxyfluoride glass containing gallium by Yb^(3+) ions codoping

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Journal of Rare Earths 2019年第5期37卷 487-491页

作者： Yapei Peng Xinqiang Yuan Long Zhang Peiguang Yan Wenfei Zhang shuangchen ruan Shenzhen Key Laboratory of Laser Engineering College of Optoelectronic Engineering Shenzhen University Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Mid-infrared laser materials with low phonon energy have significant applications. However, the development of available glass systems for high-power laser gain medium have posed a great ***, we investigated the 2.7 μm spectroscopic properties of Er^(3+)/Yb^(3+) -codoped oxyfluoride glass containing gallium, which were prepared by typically melting and quenching methods. The 2.7 μm luminescence properties of the Er^(3+)/Yb^(3+)-codoped oxyfluoride glass containing gallium were recorded by a 980 nm laser diode. The Judde Ofelt parameters, decay curves, emission cross section, energy transfer efficiency and quantum efficiency were calculated. The maximum emission cross section of YbFGa-0.5 is 1.63 × 10^(-20) cm^2 by 980 nm excitation. The energy transfer efficiency is calculated to be77.8% for the YbFGa-0.5 glass around 2700 nm. The quantum efficiency at 1530 nm is 65.6%. The result reveals that the best doping concentration ratio of Er^(3+):Yb^(3+) ions is 1:0.5, and suggests an effective energy transfer from Yb^(3+) to Er^(3+) ions.

关键词： Optical materials Optical spectroscopy Rare-earth ions doped Mid-infrared Energy transfer

Anisotropic fluoride nanocrystals modulated by facet-specific passivation and their disordered surfaces

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National Science Review 2020年第5期7卷 841-848页

作者： Ziyu Yang Huihui Zhang Junjie Xu Renzhi Ma Takayoshi Sasaki Yu-Jia Zeng shuangchen ruan Yanglong Hou Beijing Key Laboratory for Magnetoelectric Materials and Device(BKLMMD) Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)Department of Materials Science and Engineering College of Engineering Peking University College of Physics and Optoelectronic Engineering Shenzhen University International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)

Rutile-type fluorides have been proven to be active components in the context of emerging antiferromagnetic devices. However, controlled synthesis of low-dimensional, in particular two-dimensional (2D),fluorides in a predictable and deterministic manner remains unrealized because of a lack of efficient anisotropic control, which impedes their further development in reduced dimensions. We report here that altered passivation of{110}growing facets can direct the synthesis of rutile-type fluoride nanocrystals into well-defined zero-dimensional (0D) particulates, one-dimensional (1D) rods and 2D sheets in a colloidal approach. The obtained nanocrystals show positive exchange bias and enhanced magnetic transition temperature from the coexistence of long-range antiferromagnetic order and disordered surface spins,making them strong alternatives for flexible magnetic devices and sensors.

关键词： solution synthesis fluorides nanostructures magnetic properties exchange anisotropy surface effect

Scaling all-fiber mid-infrared supercontinuum up to 10 W-level based on thermal-spliced silica fiber and ZBLAN fiber

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Photonics Research 2016年第4期4卷 135-139页

作者： Zhijian Zheng Deqin Ouyang Junqing Zhao Minqiu Liu shuangchen ruan Peiguang Yan Jinzhang Wang Shenzhen Key Laboratory of Laser Engineering Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes College of Optoelectronic Engineering Shenzhen University

We demonstrate an integrated all-fiber mid-infrared(mid-IR)supercontinuum(SC)source generated by a 1.95μm master oscillator power amplifier system and a single-mode ZBLAN(ZrF_4–BaF_2–LaF_3–AlF_3–NaF)*** maximum average output power is 10.67 W with spectral bandwidth covering from～1.9 to 4.1μ*** single-mode ZBLAN fiber and silica fiber are thermal-spliced to enhance the robustness and practicability of the *** is,to the best of our knowledge,the first high-power integrated compacted all-fiber mid-IR SC source based on thermal-spliced silica fiber and ZBLAN fiber.

关键词： IR SC mode Scaling all-fiber mid-infrared supercontinuum up to 10 W-level based on thermal-spliced silica fiber and ZBLAN fiber high MFA LMA TDF

MXenes and MXene-based composites for energy conversion and storage applications

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Journal of Materiomics 2023年第6期9卷 1067-1112页

作者： Zhuohao Xiao Xiaodong Xiao Ling Bing Kong Hongbo Dong Xiuying Li Xinyuan Sun Bin He shuangchen ruan Jianpang Zhai School of Mechanical and Vehicle Engineering Linyi UniversityLinyi276000ShandongChina School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen333403JiangxiChina College of New Materials and New Energies Shenzhen Technology UniversityShenzhen518118GuangdongChina Department of Physics Jinggangshan UniversityJi'an343009JiangxiChina

MXenes have received extensive attention from scholars due to their unique layered structure,significant electrical conductivity,and excellent mechanical *** addition to their pristine forms,they could also be incorporated with other components for attaining hybrids and nanocomposites,accompanying with amplified *** has been widely used in lithium batteries,supercapacitors,electromagnetic shielding,tumor therapy,biosensors,photocatalysis,and other fields,and has shown great application potential in energy conversion and *** purpose of this article is to encyclopaedically overview the latest progress in synthesis and characterization of MXenes,while their potential applications in energy conversation such as water splitting and solar cells,as well as in energy storage such as Li-ion batteries,supercapacitors,and hydrogen energy will be comprehensively *** opportunities and challenges are summarized.

关键词： MXenes 2D materials Materials characterization Energy converstion Energy storage

Preparation of MXene-based hybrids and their application in neuromorphic devices

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International Journal of Extreme Manufacturing 2024年第2期6卷 164-188页

作者： Zhuohao Xiao Xiaodong Xiao Ling Bing Kong Hongbo Dong Xiuying Li Bin He shuangchen ruan Jianpang Zhai Kun Zhou Qin Huang Liang Chu School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403JiangxiPeople’s Republic of China School of Mechanical and Vehicle Engineering Linyi UniversityLinyi 276000ShandongPeople’s Republic of China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118GuangdongPeople’s Republic of China School of Mechanical&Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Ningbo Institute of Materials Engineering and Technology Chinese Academy of ScienceNingbo 315201ZhejiangPeople’s Republic of China Institute of Carbon Neutrality and New Energy&School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018ZhejiangPeople’s Republic of China

The traditional von Neumann computing architecture has relatively-low information processing speed and high power consumption,making it difficult to meet the computing needs of artificial intelligence(AI).Neuromorphic computing systems,with massively parallel computing capability and low power consumption,have been considered as an ideal option for data storage and AI computing in the ***,as the fourth basic electronic component besides resistance,capacitance and inductance,is one of the most competitive candidates for neuromorphic computing systems benefiting from the simple structure,continuously adjustable conductivity state,ultra-low power consumption,high switching speed and compatibility with existing CMOS *** memristors with applying MXene-based hybrids have attracted significant attention in recent ***,we introduce the latest progress in the synthesis of MXene-based hybrids and summarize their potential applications in memristor devices and neuromorphological *** explore the development trend of memristors constructed by combining MXenes with other functional materials and emphatically discuss the potential mechanism of MXenes-based memristor ***,the future prospects and directions of MXene-based memristors are briefly described.

关键词： MXene etching fabrication memristor neuromorphic

A 61-mJ,1-kHz cryogenic Yb:YAG laser amplifier

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Chinese Physics B 2021年第12期30卷 437-440页

作者： Huijun He Jun Yu Wentao Zhu Qingdian Lin Xiaoyang Guo Cangtao Zhou shuangchen ruan Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology University(SZTU)Shenzhen 518118China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

We report a diode-pumped rod-type Yb:YAG laser amplifier operating at 1 *** cooling method was adopted to make the Yb:YAG crystal work with four-level behavior.A single-frequency fiber laser acts as the seed in an actively Q-switched Yb:YAG *** resonator delivers 5.75-mJ pulses at 1 kHz with a pulse duration of approximately 40 *** pulses were amplified to 61 mJ in a four-pass rod-type Yb:YAG amplifier with optical-to-optical efficiency of 24%in the main *** M^(2)parameter of the output laser is<1.4.

关键词： ytterbium laser system Yb:YAG laser amplifier cryogenic laser amplification high energy laser amplification

Radiation-pressure-induced photoluminescence enhancement of all-inorganic perovskite CsPbBr3 quantum dots

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Photonics Research 2019年第8期7卷 837-846页

作者： YING ZHANG HAIOU ZHU TAIWU HUANG ZONGPENG SONG shuangchen ruan Center for Advanced Material Diagnostic Technology College of Engineering PhysicsShenzhen Technology UniversityShenzhen518118China Guangdong Provincial Key Laboratory of Mico/Nano Optomechatronics Engineering College of Optoelectronic EngineeringShenzhen UniversityShenzhen518060China College of New Materials and New Energies Shenzhen University of TechnologyShenzhen518118China

Perovskite quantum dots(QDs) are of great interest due to their outstanding optoelectronic properties and tremendous application potential. Improving photoluminescence(PL) spectra in all-inorganic perovskite QDs is of great importance for performance enhancement. In this work, the PL quantum yield of the CsPbBr3 perovskite QDs is enhanced from 70% to 95% with increasing radiation pressure. Such enhancement is attributed to the increased binding energy of self-trapped excitons(STEs) upon radiation pressure, which is consistent with its blue-shifted PL and other characterization results. Furthermore, we study ultrafast absorption spectroscopy and find that the dynamics of relaxation from free excitons to STEs in radiation pressure CsPbBr3 QDs is ascribed to stronger electron–phonon coupling in the contracted octahedral structure. It is further demonstrated that radiation pressure can boost the PL efficiency and explore effectively the relationship between the structure and optical properties.

关键词： PL QDs Radiation-pressure-induced photoluminescence enhancement

Pulse control of frequency and width for a real-time independently adjustable laser source

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Frontiers of Information Technology & Electronic Engineering 2021年第10期22卷 1379-1389页

作者： Zhiwei YANG Xu WU Deqin OUYANG Encheng ZHANG Huibin SUN shuangchen ruan Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Physics Science and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Sino-German Intelligent Manufacturing Shenzhen Technology UniversityShenzhen 518118China

A set of semiconductor laser pulse seed sources based on an embedded chip is *** greatest feature is that the optical pulse frequency and width can be independently adjusted in real *** pulse seed sources can be switched independently and online from the gain-switched mode to the quasi-continuous wave mode to obtain optimal optical parameters for specific *** explore the physical mechanism of the semiconductor laser source,the rate equation that describes the carrier-photon transient change in a semiconductor laser cavity is numerically derived and ***,problems that need to be considered while designing the drive circuit are *** system evaluation indicates that the optical pulse frequency adjustment range is 250 Hz to 42 MHz,and the narrowest optical pulse output width is 80 *** pulse seed source can drive semiconductor lasers with different central wavelengths(1064,1550,and 1970 nm),and can also simultaneously drive two semiconductor lasers and output dual-band optical *** can be used as a seed source for general high-power optical systems,and exhibits good application value and extensive market prospects.

关键词： Electric variable control Electronic design automation and methodology Optical pulse generation Optical control

Two-micron all-fiberized passively mode-locked fiber lasers with high-energy nanosecond pulse

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High Power Laser Science and Engineering 2020年第2期8卷 32-39页

作者： Meng Wang Yijian Huang Zongpeng Song Jincheng Wei Jihong Pei shuangchen ruan Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology UniversityShenzhen 518118China College of Electronic Information Engineering Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Laser Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and System of Ministry of Education College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

We report on mode-locked thulium-doped fiber lasers with high-energy nanosecond pulses,relying on the transmission in a semiconductor saturable absorber(SESA)and a carbon nanotube(CNTs-PVA)film separately.A section of an SMF-MMF-SMF structure multimode interferometer with a transmission peak wavelength of^2003 nm was used as a wavelength selector to fix the laser *** the SESA acted as a saturable absorber(SA),the mode-locked fiber laser had a maximum output power of^461 mW with a pulse energy of^0.14µJ and a pulse duration of^9.14 *** a CNT-film-based mode-locked fiber laser,stable mode-locked pulses with the maximum output power of^46 mW,pulse energy of^26.8 nJ and pulse duration of^9.3 ns were *** the best of our knowledge,our experiments demonstrated the first 2µm region‘real’SA-based dissipative soliton resonance with the highest mode-locked pulse energy from a‘real’SA-based all-fiberized resonator.

关键词： high pulse energy mode-locking nanosecond pulse Tm-doped fiber laser