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SSRN 2022年

作者： Hu, Ping Mao, Jiajia Zhou, Xue Feng, Tianli Nie, Hongkun Wang, Ruihua Zhang, Baitao Li, Tao He, Jingliang Yang, Kejian Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan250100 China China Key Laboratory of Laser & Infrared System Ministry of Education Shandong Provincial Key Laboratory of Laser Technology and Application School of Information Science and Engineering Shandong University Qingdao266237 China School of Shenzhen Research Institute Shandong University Shenzhen518057 China School of State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Taiyuan030006 China School of Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan250358 China

A passively Ho-doped fiber laser at 2 μm with soliton rain and noise-like pulse (NLP) operation regime has been realized by using nonlinear polarization rotation (NPR) technology. By adjusting the polarization state, the evolution phenomenon of soliton rain pulse and the NLP are obtained. The typical NLP mode-locking operation regime is achieved by finely adjusting pump power and polarization state, which delivers a corresponding pulse energy of 8.93 nJ with pulse width of 1.31 ps. The soliton rain operation regime with multiple solitons is achieved by finely adjusting pump power, which delivers a corresponding pulse energy of 22.98 nJ with pulse width of 1.21 ps. In addition, a NLP mode-locking operation regime is obtained again under a proper pump power and polarization state with a corresponding pulse energy of 34.14 nJ and pulse width of 1.208 ps. The experimental results well demonstrate the evolution of ultrashort pulse regime with the pump power and polarization state in passively mode-locked Ho-doped fiber lasers at 2 μm. © 2022, The Authors. All rights reserved.

关键词： Fiber lasers

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Mid-infrared dark pulse microcomb generation using the dual-pump scheme

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Optics Communications 2025年

作者： Zerong Jia Lei Shi Gaoyou Liu Zhigang Zhao Zhaojun Liu Leiran Wang Wenfu Zhang School of Information Science and Engineering and Key Laboratory of Laser & Infrared System (Shandong University) Ministry of Education Shandong University Qingdao 266237 China Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Qingdao 266237 China State Key Laboratory of Ultrafast Optical Science and Technology Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an 710119 China University of Chinese Academy of Sciences Beijing 100049 China

A dual-pump dark pulse generation mechanism based on normal-dispersion Si microresonators compatible with commercial quantum cascade lasers (QCLs) is numerically investigated. It is found that there exists a constant threshold of ∼75 mW for the total power, together with a same minimum power of ∼12 mW each for the primary and auxiliary laser to support the dark pulse microcomb. Further investigation reveals that the strong thermo-optic effect of Si can contribute to the mode-locking region expanding by 1.5 times along with the increase of pump power. Therefore, such dual-pump approach in the normal-dispersion microresonators, which allows flexible configuration of pump lasers and reduces the requirement for high power and frequency tuning, can provide a solution towards compact MIR microcombs.

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Mid-infrared Q-switch performance of ZrC

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Photonics Research 2020年第12期8卷 1857-1861页

作者： YANGYANG LIANG TAO LI WENCHAO QIAO TIANLI FENG SHENGZHI ZHAO YUEFENG ZHAO YUZHI SONG CHRISTIAN KRÄNKEL China Key Laboratory of Laser&Infrared System(Shandong University) Ministry of EducationQingdao 266237China School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and ApplicationShandong UniversityQingdao 266237China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China School of Physics and Electronics Shandong Normal UniversityJinan 250358China Leibniz-lnstitut fur Kristallzuchtung 12489 BerlinGermany

Zirconium carbide(ZrC)with layered structure and nanoparticle morphology was prepared by sonication in an ethyl alcohol *** morphology and saturable absorption properties of the ZrC were systematically *** using ZrC nanoparticle coated substrates as saturable absorbers,stable Q-switched 3μm Er:Lu_(2)O_(3) lasers were *** durations of 50 ns with pulse energies of 20μJ and peak power of 0.4 kW are the shortest obtained with novel-material-based Q-switched lasers in the 3μm wavelength range.

关键词： switched absorber shortest

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SH type guided wave transducer based on Ca2Al2SiO7 piezoelectric crystal for high-temperature structure health monitoring

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Applied Physics Letters 2022年第11期120卷

作者： Chao Jiang Yong Long Fapeng Yu Xiufeng Cheng Xian Zhao 1Key Laboratory of Laser & Infrared System Ministry of Education State Key Laboratory of Crystal Materials Shandong University Qingdao China 226th Institute of China Electronics Technology Group Corporation Chongqing China

The development of high-temperature guided wave transducers for high-temperature structure health monitoring is of great interest in many aspects of industrial engineering. In this work, the zero-order shear horizontal (SH0) guided wave transducer was designed and analyzed based on the X-plate from Ca2Al2SiO7 (CAS) crystals. Furthermore, the excitation and reception performances were evaluated. It is determined from the finite element simulation that the CAS-based guided wave transducer can excite pure SH0 waves in a specific direction. Experimental results confirmed that pure SH0 waves could be achieved and received by the designed CAS-based transducer, which is in good agreement with the theoretical study. Strong SH0 wave signals were chosen at elevated temperatures, and a moderate signal-to-noise ratio >12 dB was realized at the high temperature of 600 °C, showing the advantages of a CAS-based transducer for high-temperature sensing application.

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Breakup and Recovery of Topological Zero Modes in Finite Non-Hermitian Optical Lattices

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Physical Review Letters 2019年第16期123卷 165701-165701页

作者： Wange Song Wenzhao Sun Chen Chen Qinghai Song Shumin Xiao Shining Zhu Tao Li National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Integration Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China

The topological edge state (TES) in a one-dimensional optical lattice has exhibited robust field localization or waveguiding against the structural perturbations that would give rise to fault-tolerant photonic integrations. However, the zero mode as a kind of TES usually deviates from the exact zero-energy state in a finite Hermitian lattice due to the coupling between these edge states, which inevitably weaken the topological protection. Here, we first show such a breakup of zero modes in finite Su-Schriffer-Heeger optical lattices and then reveal their recovery by introducing non-Hermitian degeneracies with parity-time (PT) symmetry. We carry out experiments in a finite silicon waveguide lattice, where a passive-PT symmetry was implemented with carefully controlled lossy silicon waveguides. The experimental results are fully compatible with the theoretical prediction. Our results show that the topological property of an open system can be tuned by non-Hermitian lattice engineering, which offers a route to enhance the topological protection in a finite system.

关键词： Edge states Phase transitions by order Topological effects in photonic systems Waveguide arrays

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Gd 3 Ga 5 O 12 : a wide bandgap semiconductor electrolyte for ceramic fuel cells, effective at temperatures below 500 °C

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Journal of Rare Earths 2024年

作者： Junjiao Li Muhammad Yousaf Jahangeer Ahmed Bushra Bibi Asma Noor Norah Alhokbany Muhammad Sajid Atif Nazar M.A.K. Yousaf Shah Xiaofeng Guo Xiangqin Ding Naveed Mushtaq Yuzheng Lu Department of Electronic and Engineering Nanjing Vocational Institute of Mechatronic Technology Nanjing 211306 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 China Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh 11451 Saudi Arabia Energy Storage Joint Research Center School of Energy and Environment Southeast University Nanjing 210096 China Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Institute of Microscale Optoelectronics Optical Engineering Shenzhen University Shenzhen 518060 China School of Physics Electronics and Intelligent Manufacturing Huaihua University Huaihua 418000 China Jiangsu Key Laboratory of Zero-Carbon Energy Development and System Integration Nanjing Xiaozhuang University Nanjing 211171 China

Searching for compatible electrolytes with Ni 0.8 Co 0.15 Al 0.05 LiO 2 (NCAL) electrodes with high ionic conductivity at low operational temperatures (<550 °C) is essential for the research on ceramics fuel cells (CFCs). In this work, the experimental and theoretical analyses demonstrate that the highly stable single-phase Gd 3 Ga 5 O 12 (GGO) garnet structure, composed of Gd-O octahedrons and Ga-O tetrahedrons, provides more active sites for ion transport, resulting in enhanced peak power density (PPD) and stable open circuit voltage (OCV) at low operational temperature. The unique internal garnet structure effectively reduces the interfacial impedance of the prepared fuel cell device, provides many active sites at triple-phase boundaries and increases the electrochemical stability. As a result, the constructed cell can deliver a superior peak power density of 770 mW/cm 2 at 490 °C. In addition, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and theoretical calculations further demonstrate electrolyte effectiveness of GGO, enabling stable OCV even at a low temperature of 370 °C under a H 2 /air environment. This work can help in improving the understanding of the underlying mechanisms of a single-layer fuel cell device, which is essential to further develop this potential energy technology even at a very low temperature of 370 °C.

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Polymeric 32-channel arrayed waveguide grating multiplexer using fluorinated poly (ether ether ketone)

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Chinese Optics Letters 2004年第10期2卷 568-570页

作者：王菲孙伟李艾泽衣茂斌姜振华张大明 State Key Laboratory on Integrated Optoelectronics Jilin University Region Changchun 130023 Department of Chemistry Jilin University Changchun 130023 State Key Laboratory on Integrated Optoelectronics Jilin University Region Changchun 130023n wavelength division multiplexing (WDM) systems an arrayed waveguide grating (AWG) multiplexer is a key component. A polymeric AWG multiplexer has recently attracted much attention due to its low cost processing and a potential of integration with other devices. Fluorinated poly (ether ether ketone) (FPEEK) is excellent material for fabrication of optical waveguides due to its low absorption loss at 1.55-μm wavelength and high thermal stability. A 32-channel AWG multiplexer has been designed based on the grating diffraction theory and fabricated using newly synthesized FPEEK. During the fabrication process of the Polymer/Si AWG device spin coating vaporizing photolithographic patterning and reactive ion etching (RIE) are used. The AWG multiplexer measurement system is based on a tunable semiconductor laser infrared camera and a Peltier-type heater. The device exhibits a wavelength channel spacing of 0.8 nm and a center wavelength of 1548 nm in the room temperature.

In wavelength division multiplexing (WDM) systems, arrayed waveguide grating (AWG) multiplexer is a key component. Polymeric AWG multiplexer has recently attracted much attention due to its low cost processing and a potential of integration with other devices. Fluorinated polyether ether ketone (FPEEK) is excellent material for fabrication of optical waveguides due to its low absorption loss at 1.55-μm wavelength and high thermal stability. A 32-channel AWG multiplexer has been designed based on the grating diffraction theory and fabricated using newly synthesized FPEEK. During the fabrication process of the polymer/Si AWG device, spin coating, vaporizing, photolithographic patterning and reactive ion etching (RIE) are used. The AWG multiplexer measurement system is based on a tunable semiconductor laser, an infrared camera and a Peltier-type heater. The device exhibits a wavelength channel spacing of 0.8 nm and a center wavelength of 1548 nm at room temperature.

关键词： Diffraction gratings Fluorine compounds Optical waveguides Polyether ether ketones Reactive ion etching Thermodynamic stability

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AN AIRBORNE PASSIVE ACTIVE ELECTROOPTIC SENSOR system FOR THEATER BALLISTIC-MISSILE DEFENSE

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 192-207页

作者： DAVIDSON, SA GRIMM, JG BLUMENAU, PM SCHULTZ, KI KACHELMYER, AL SULLIVAN, LJ KEICHER, WE HESS, M PRINCE, A MARTIN, M Steven A. Davidson:is a staff member in the Air Defense Systems Group at MIT Lincoln Laboratory where he has worked for the past six years on a variety of active and passive electro-optic sensors and sensor technology. Dr. Davidson received his BA degree in physics from Williams College and his MS and Ph.D in physics from the University of Colorado Boulder. His doctoral thesis was on theoretical and experimental research he performed at the National Bureau of Standards on the far-infrared rotational spectra and structure of diatomic molecules. After joining the staff of the Laser Radar Measurements Group at MIT Lincoln Laboratory in December 1987 he became involved in many aspects of laser radar including: E-O modulators for laser radar transmitters and receivers subsystem integration of the Firepond imaging laser radar and an analysis of the IR laser radar images from the Firefly I experiment. He served as the scientific advisor to NASA Wallops Flight Facility for the Firefly II experiment. Dr. Davidson was the project engineer for the Brilliant Eyes Proof-of-Principle (BE PoP) Active Tracking Receiver a sensor which included a laser radar that used single photo-electron events (“photon counting”) and a high bandwidth agile passive angle tracking system. The BE PoP sensor made precision range and angle measurements(˜1 meter and ? μrad respectively) of an unenhanced (“skin track”) sub-orbital spacecraft at a range of 725 km. as part of the Firebird IB experiment. Dr. Davidson was also the project engineer for the follow-on Brilliant Eyes Transportable Testbed Phase I and one of the principle architects of the Gatekeeper sensor (the subject of this paper). LCdr. Mary E. Martin: USN received her BA and MS in physics from New York University. She entered naval service in 1978 and is currently assigned to the space and naval warfare systems command directed energy division SpaWar 332 Strategic FO Sensor Systems. Her previous assignments include service as the electrical repair officer aboardHolland(AS-3

An airborne passive/active surveillance aircraft-based, electro-optic sensor system, named Gatekeeper, is being developed for the US Navy Theater Ballistic Missile Defense Program. The sensor is designed to detect theater ballistic missiles (TBMs), either in boost or post-boost phase, and make precision three-dimensional measurements of the TBM's post-boost, ballistic trajectory with sufficient state-vector accuracy for handover to naval, air and land based missile defense systems. The sensor includes a dual-band IRST for acquisition, a precision angle tracker (MWIR focal-plane array and high-bandwidth mirror), and a short-pulse, direct detection laser radar. The sensor subsystems are coupled and controlled by a sophisticated multiprocessor computer control system. The system has a highly compressed engagement timeline resulting in a substantial target handling capacity. This paper describes the sensor, its specifications, and performance in terms of the accuracy of the state-vector, and its target handling capability in a realistic engagement scenario.

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