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Broadband Ultrafast Ultraviolet laser Output by Using Β-Bab2o4 Crystal

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SSRN 2023年

作者： Ning, Hui Wang, Lirong Tang, Guangxin Zhang, Ling Li, Xingxing Joint Lab of Digital Optical Chip Wuyi University Jiangmen529020 China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Key Lab of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

In this paper, a broadband ultrafast ultraviolet (UV) laser was generated through sum-frequency method with β-BaB2O4 (BBO) crystal by using a femtosecond (fs) Ti:sapphire laser as the fundamental laser source. We studied the relationship between laser wavelengths and the optimum phase matching angles of BBO crystal, the influence of the power ratio between the fundamental frequency and second harmonic laser beams on output power and conversion efficiency of UV laser, and accurately compensated the phase mismatch between fundamental frequency and second harmonic laser beams in BBO crystal during the sum-frequency generation (SFG). The UV laser beam generated by BBO crystal has a tuning range from 226.7 nm to 360 nm with high conversion efficiency, the maximum output power at 270 nm was 556 mW. © 2023, The Authors. All rights reserved.

关键词： Ultraviolet lasers

Design and Exploratory Synthesis of Infrared Nonlinear Optical Metal Chalcogenides: Recent Advances and Future Perspectives

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Chinese Journal of Structural Chemistry 2020年第9期39卷 1559-1563,1553页

作者： LI Zhuang YAO Ji-Yong WU Yi-Cheng Beijing Center for Crystal Research and Development Key Lab of Functional Crystals and Laser TechnologyTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Institute of Functional Crystal Materials Tianjin University of TechnologyTianjin 300384China

Design and exploratory synthesis of novel infrared nonlinear optical chalcogenides have drawn extensive concerns owing to their excellent overall performance and important role in laser *** the past decades,a large number of infrared nonlinear optical chalcogenides have been developed and many effective design strategies have been summarized,which illuminates the path of future *** this perspective,we discuss the feasibility and effectiveness of the representative design ***,we point out some topics to be investigated and discuss the future research directions.

关键词： metal chalcogenide design exploratory synthesis nonlinear optical

The crystal structures, magnetic interactions and cryogenic magnetocaloric effects for NaGdXO4 (X=Si, Ti) compounds

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Journal of Alloys and Compounds 2025年 1010卷

作者： Chen, Zuhua Zhang, Guochun Wang, Changkun Gao, Jiahao Zhang, Yicai Yu, Shilin Zhao, Yanan Li, Zhenxing Shen, Jun Tu, Heng Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Centre for Micro/Nanomaterials and Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China

The development of ultra-low temperature magnetic refrigeration technologies demands magnetic refrigeration materials with excellent properties. Hence, improving performances of magnetic refrigerants has always been a significant scientific issue in magnetic refrigeration field. In this article, the relationship of crystal structures, magnetic interactions and magnetocaloric effect (MCE) for NaGdSiO4 and NaGdTiO4 has been investigated. NaGdSiO4 and NaGdTiO4 both crystallizes orthogonal structure, but the significant difference of unit cell parameters and symmetries results in different arrangement of Gd atoms. The distorted crystal structure and weaker magnetic between Gd3+ ions make NaGdSiO4 exhibit larger MCE with the maximum magnetic entropy change (-∆SM) of 49.0 J·kg−1·K−1 at 2.8 K. Comparably speaking, NaGdTiO4, which is a quasi-triangular antiferromagnet, possesses a stronger magnetic interaction between Gd3+ ions with the maximum -∆SM of 31.9 J·kg−1·K−1 at 2.6 K. These results confirm the importance of magnetic interactions for magnetic refrigeration materials, and, more broadly, they highlight the significance of crystal structures in that field. © 2024 Elsevier B.V.

关键词： Titanium compounds

Aeag7(Ps4)3 (Ae = Ba, Sr): The Homovalent Substitution of Lead by Alkaline Earth Metals Achieves the Separation of the Two Phases and Enlarges the Band Gap

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SSRN 2023年

作者： Tang, Jian Xing, Wenhao Tang, Chunlan Wu, Jieyun Xia, Mingjun Yin, Wenlong Kang, Bin Deng, Jianguo Institute of Chemical Materials China Academy of Engineering Physics Mianyang621900 China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Chengdu611731 China

Two alkaline earth metal-containing thiophosphate compounds, BaAg7(PS4)3 and SrAg7(PS4)3, were synthesized via the homovalent substitution of Pb2+ in PbAg7(PS4)3 by Ba2+ and Sr2+, respectively. The space group of BaAg7(PS4)3 (P21/c) and SrAg7(PS4)3 (P63/m) is the same as the low- and high-temperature phases of PbAg7(PS4)3, respectively. The two compounds exhibit structural similarity and possess three-dimensional honeycomb-shaped architectures. These honeycomb structures are arranged in a layered fashion via hexagonal rings, which arise from the sharing of edges or vertices between [AgS4] and [PS4] tetrahedral, accommodating discrete entities of Ba2+ and Sr2+ cations. BaAg7(PS4)3 melts congruently with a melting point of 760 ℃ and a solidification point of 675 oC, while the melting behaviour of SrAg7(PS4)3 was incongruently and thermally stable up to 689 ℃ under vacuum of 1×10−3 Pa. Moreover, the band gaps of BaAg7(PS4)3 (2.69 eV) and SrAg7(PS4)3 (2.85 eV) have a significant enlargement compared to PbAg7(PS4)3 (2.09 eV). The combination of d10 cation Ag+ with second-order Jahn-Teller distortion and alkaline earth metals cation enriches the system of new metal thiophosphates and provides ideas for exploring other functional materials. © 2023, The Authors. All rights reserved.

关键词： Silver compounds

Ba4cd2ge2te9: A Promising Infrared functional Crystal with Large Birefringent And Photoluminescent Properties

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SSRN 2023年

作者： Sun, Mengran Su, Haojian Liu, Wenhao Yao, Jiyong Beijing Center for Crystal Research and Development Key Lab of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Beijing100190 China

Herein, a new Cd-based telluride Ba4Cd2Ge2Te9 has been successfully obtained and fully characterized, which is the first compound identified in the Ba-Cd-Ge-Te system. It crystallizes in the Pbcm space group and its structure features infinite [Cd2Ge2Te9]8- chains, with Ba2+ filling in the interstitial to balance the charge. The fluorescence spectrum demonstrates that the title compound can generate purple-emission with central wavelength of 415-459 nm under 300 nm excitation light. In particular, the luminescence lifetime of the 436 nm peak is about 1.18 ns. Moreover, the birefringence of Ba4Cd2Ge2Te9 is as large as 0.298@2090 nm and derives from the superposition of the polarizabilities of the terminal Te atom and Ge2Te6 unit, on the basis of the first-principles calculations. Thermoelectricity measurements demonstrate that title compound possess large Seebeck coefficient (655 μV K−1 @300 K) and low thermal conductivity (0.87 W m-1 K-1 @300 K). © 2023, The Authors. All rights reserved.

关键词： Germanium alloys

Microstructuring Conductive Electrospun Mats for Enhanced Electro‑active Biofilm Growth and High‑Performance Bioelectrocatalysis

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Advanced Fiber Materials 2023年第5期5卷 1699-1711页

作者： Min Li Hao Lu Jiadong Hu Xuemei Xiang Yanling Zheng Wenhu Gao Wei Sun Wei Wang Zhisong Lu Yan Qiao Institute for Clean Energy and Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Sino‑Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Experimental Center for Virtual Simulation of Sports and Health Southwest UniversityChongqing 400715People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University TechnologyWuhan 430070People’s Republic of China Hubei Longzhong Lab Xiangyang 441000People’s Republic of China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158People’s Republic of China Singapore Institute of Manufacturing Technology Singapore 138669Singapore

Electrospun materials have attracted considerable attention in microbial fuel cells(MFC)owing to their porous structures,which facilitate the growth of electro-active biofilms(EABs).However,the impact of fiber diameter-controlled porous architectures on EAB growth and MFC performance has not been extensively ***,a highly conductive polypyrrole-modified electrospun polyacrylonitrile(PAN)mat was prepared as an electrode material for Shewanella putrefaciens CN32-based *** dominant pore size of the corresponding mat increases from 1 to around 20μm as the fiber diameter increases from 720 to 3770 *** variation affects the adhesion and growth behaviors of electrochemically active bacteria on the mat-based *** electrodes with poresranging from 2 to 10μm allow bacterial penetration into the interior,leading to significant biofilm loading and effective ***,the tight lamination of the electrospun fibers restricts bacterial growth in the deep interior *** developed a friction-induced triboelectric expanding approach to rendering the mats with layered structures to overcome this *** inter-layer spaces of the expanded conductive mat can facilitate bacterial loading from both sides of each layer and serve as channels to accelerate the catalysis of organic ***,the expanded conductive mat with appropriate pore sizes delivers superior bioelectrocatalytic performance in MFCs and dye *** on the findings,a mechanism for the porous structure-controlled EAB formation and bioelectrocatalytic performance was *** work may provide helpful guidance and insights for designing microfiber-based electrodes for microbial fuel cells.

关键词： Electrospun mat Porous structure Bioelectrocatalysis Microbial fuel cells Polypyrrole

Picosecond laser output at 355 nm adopting sum-frequency method based on CsB3O5 crystal 2

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Picosecond laser output at 355 nm adopting sum-frequency met...

2nd International Conference on laser, Optics and Optoelectronic technology, LOPET 2022

作者： Wang, Lirong Tang, Guangxin Yan, Xin Luan, Zhihao Zhang, Guochun Zhu, Jiangfeng Li, Hongfeng Zhang, Ling Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing100190 China Key Lab of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China School of Optoelectronic Engineering Xidian University Xi’an710071 China School of Mechanical and Electrical Engineering Beijing Institute of Graphic Communication Beijing102600 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781510657588

Ultraviolet (UV) light source has very important applications due to its high single photon energy, short laser wavelength and low thermal effect during processing. A high-performance way to acquire UV light source at 355 nm is using sum-frequency method. CsB3O5 (CBO) crystal is a good UV nonlinear optical (NLO) crystal, it can be used to generate UV laser. We acquired high output power UV picosecond (ps) light source at 355 nm through sum-frequency method based on type II phase-matched CBO crystal. As the 1064 nm laser power was 84.8 W, a 30.3 W of 355 nm UV light source with a repetition rate of 600 kHz was achieved. The optical conversion efficiency from the infrared fundamental laser to the UV third-harmonic laser was up to 35.7%. We measured the power stability of the 355 nm UV laser at the maximum power of 30.3 W. The root mean square (RMS) value of the power instability was 0.386% for about thirty minutes. These findings reveal that CBO crystal has great potential in the application of ultrafast UV light source generation with high power. © 2022 SPIE.

关键词： Phase matching

Hierarchically Porous Zno Derived from Zeolitic Imidazolate Frameworks for High-Sensitive Mems No2 Sensor

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SSRN 2024年

作者： Zhang, Dan Luo, Na Xue, Zhenggang Bai, Yueling Xu, Jiaqiang NEST Lab Department of Physics College of Science Shanghai University Shanghai200444 China Hainan Engineering Research Center of Tropical Ocean Advanced Optoelectronic Functional Materials Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical Engineering Hainan Normal University Haikou571158 China

Three-dimensional (3D) porous metal oxide nanomaterials with controllable morphology and well-defined pore size have attracted extensive attention in the field of gas sensing. Herein, hierarchically porous ZnO-450 was obtained simply by annealing Zeolitic Imidazolate Frameworks (ZIF-90) microcrystals at an optimal temperature of 450°C, and the effect of annealing temperature on the formation of porous nanostructure was discussed. Then the as-obtained ZnO-450 was employed as sensing materials to construct a Micro-Electro-Mechanical System (MEMS) gas sensor for detecting NO2. The MEMS sensor based on ZnO-450 displays the excellent gas-sensing performances at a lower working temperature (190°C), such as high response value (242.18% @ 10 ppm), fast response/recovery time (9/26 s) and ultralow limit of detection (35 ppb). The ZnO-450 sensor shows better sensing performance for NO2 detection than ZnO-based composites materials or commercial ZnO nanoparticles (NPs), which are attributed to its unique hierarchically structures with high porosity and larger surface area. This ZIFs driven strategy can be expected to pave a new pathway for the design of high-performance NO2 sensors. © 2024, The Authors. All rights reserved.

关键词： II-VI semiconductors

Growth Characteristics of Li:Srb4o7 and Shg Properties Based on Random Quasi-Phase-Matching

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SSRN 2023年

作者： Wu, Yuhao Zhao, Ying Jiao, Zhiwei Hou, Zhengzheng Zhang, Fengfeng Zhang, Shenjin Sun, Xizhi Beijing100044 China Beijing Composite Materials Co. Ltd Beijing102101 China Key Laboratory of Functional Crystals and Laser Technology TIPC CAS Beijing100043 China Department of Mechanical and Aerospace Engineering Brunel University London UxbridgeUB8 3PH United Kingdom

In this paper, high quality SBO crystals with regular distribution of domain structure induced by Li+ doping are obtained. The crystal growth conditions, domain structure morphology and growth characteristics were investigated by thermal analysis, XRD, microstructure observation, etc. The results proved that the derivation of crystal domain structure depends on the growth direction of crystal, which makes the crystal to realized "Random Quasi-phase-matching (RQPM), and Li+-doping enhances this result. Further frequency-doubling effect tests show that the as-prepared crystal device can realize the frequency-doubling conversion of lasers from 532 nm to 266 nm, which provides the ideas and methods for the further development and application of NLO crystals. © 2023, The Authors. All rights reserved.

关键词： Doping (additives)