2024
2024
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Record 457 of
Title:Design of Function-based Frozen Water Cylinder Twin Photonic Hook Generator
Author Full Names:Dong, Xueli(1); Han, Guoxia(1); Tian, Yihan(1); Hu, Ke(1); Yu, Xianghua(2); Zhan, Kaiyun(1)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Photonic nanojet is a kind of highly focused subwavelength locally electromagnetic beam that is formed by the scattering of dielectric micro-particle on light field,when the symmetry of system that is composed of light field and micro-particle is broken,a kind of subwavelength locally curved beam is formed,photonic hook. It is featured by a sub-diffraction limit of half-height width and a much smaller radius of curvature than wavelength. Due to these excellent performance parameters,the photonic hook has broad application prospects in the field of optical imaging,optical manipulation and trapping. Since the concept of photonic hook was proposed,researchers have been exploring the factors influencing the effective length and bending angle of photonic hooks,such as the parameters related to the properties of the medium particles(e.g.,size,structure,material)and the characteristics of the light field. Among them, most studies focus on the exploration of the structure of the micro-particle,and many different structures have been developed,but the material of the micro-particle is a dielectric or an artificial material. The state of water cylinder is changed at freezing,so frozen water cylinder can be a phase change material. Using frozen water droplet as phase change materials and the ice-water interface as plane,the generation of time-domain self-bending photonic hook has attracted much attention. However,the generated photonic hook has a relatively small effective length and a small curvature. During the freezing process of water cylinder, the shape at the state transition does not have a quantitative model for description. This paper sets the functions as boundaries for the state transition of materials and introduces the idea of functions from mathematics into the device design of photonic hooks. A twin photonic hook generator is designed using frozen water cylinder as phase change materials and function surfaces as the ice-water boundary interface. The software COMSOL is used for simulation,and effective control of the characteristic parameters of the photonic hooks was achieved by altering the structure of the frozen water cylinder and the coefficients of the functions. The variation patterns of characteristic parameters such as effective length,bending angle,and the bending number of the photonic hooks were analyzed. The results show that the coefficients A,B,and C are respectively related to the opening angle,rotation direction,and depth of concavity of the function. The opening of the ice-water boundary obtains a twin photonic hook when there is symmetry with respect to the direction of illumination. As the asymmetry increases,the twin photonic hook gradually transforms into a single photonic hook. When the ice-water boundary opening increases under symmetric incidence, the effective length shows an initial growth followed by a decrease trend. Meanwhile,the bending angle also shows an initial increase followed by a decrease trend. Moreover,during the gradual enlargement of the opening,the phenomenon of multiple bending of the photonic hook becomes more pronounced. When the concave depth continues to increase, the effective length initially decreases and then shows a lengthening trend,while the overall bending angle shows an initial increase followed by a decrease trend. Among them,the maximum bending angle of the photonic hook can reach up to 44°(A=14.79,B=0, C= - 9,D=0),the maximum effective length can reach up to 17.43λ(A=177.51,B=0,C= - 12, D=0),and the number of bending cycles can reach up to 4. Compared to traditional methods,this design introduces functions to achieve research on more complex structures of photonic hooks and further enables the modulation of characteristic parameters of photonic hooks. This provides new insights for the design and research of photonic hooks,while also offering references for their applications in areas such as optical manipulation and biomedicine. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) College of science, China University of Petroleum(East China), Qingdao; 266580, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, ChinaPublication Year:2024Volume:53Issue:11Article Number:1126002DOI Link:10.3788/gzxb20245311.1126002數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20245117562981 -
Record 458 of
Title:Fabrication and Mid-Infrared Laser Transmission Performance of Ultra-Low Loss Chalcogenide Glass Fibers
Author Full Names:Xu, Yantao(1); Guo, Haitao(1); Xiao, Xusheng(1); Li, Man(2); Yan, Mengmeng(2)Source Title:Guangxue Xuebao/Acta Optica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Objective With the continuous development of infrared optics, the demand for infrared laser transmission in such fields as national defense and security, biomedicine, and advanced manufacturing is becoming increasingly urgent, and therefore infrared energy transmission fibers are receiving increasing attention. The chalcogenide glass, as an excellent infrared material, features a wide transmission range, stable physic-chemical properties, and easy fiber formation, which makes it an ideal material for infrared energy transmission fibers. The high optical loss of domestically produced chalcogenide glass fibers currently limits their widespread applications. The origin of the optical loss for chalcogenide glass fibers mainly includes the absorption loss of C, H, O, and other impurities; scattering loss caused by heterogeneous particle impurities and striae; scattering loss caused by the interface defects between the core and cladding. For suppressing the absorption loss and scattering loss in chalcogenide glasses and obtaining ultra-low loss fibers, gas (chlorine gas)-gas (glass vapor) and solid (aluminum)-liquid (glass melt) chemical reactions are employed to reduce the absorption loss of fibers. A three-dimensional laser microscopic imaging system is established and adopted to detect micron- and submicron-sized defects inside the glass and fiber, and the preparation process is correspondingly optimized to reduce the scattering loss of fibers. The laser energy transmission experiments of fiber laser (wavelength is 2.0 μm) and dual wavelength optical parameter oscillator (OPO) laser (wavelength is 3.8 μm and 4.7 μm) are also carried out. Methods High purity S and As elements are utilized to prepare rod (As40S60) and tube (As39S61). S distilled at 200 ℃ and As sublimed at 350 ℃ are encapsulated in the ampoule and then melted at 750 ℃ for 12 h to obtain preform glasses. Further, hydrogen impurities with the high purity Cl2 are eliminated. Cl2 is introduced into the molten glass and the quantity of flow is 5 ml/min for 300?600 s. The glass is melted again to allow a reaction between the Cl2 and hydrogen ions. Then the melted product is distilled under a dynamic vacuum to eliminate any gaseous byproducts from the reaction with Cl2. The third step is to eliminate oxygen impurities with elemental aluminum. Al foils with a mass fraction of 0.3% are introduced into the glass and melted at 600 ℃. Oxygen impurities react with Al foils to form Al2O3 which is left on the surface of Al foils, thus obtaining high-purity glasses. The optical fiber is prepared by the rod-in-tube method. The core and cladding diameters are 200 μm/250 μm for multi-mode fiber and 9 μm/140 μm for single-mode fiber, respectively. The single-mode fiber can maintain single-mode transmission in the 3?5 μm band. The fiber is drawn at about 320 ℃ in a nitrogen-protected environment. The optical fiber loss is measured by the cutback technique and the scattering intensity of the chalcogenide glasses and fibers are examined by a highly sensitive InGaAs detector from the direction perpendicular to the light path (Fig. 4). Results and Discussions The additive amounts of Cl2 are 300, 480, and 600 s, and the samples are recorded as C1, C2, and C3, respectively. The absorption spectra of C1, C2, and C3 samples show that with the increasing Cl2, the absorption intensity at 4.1 μm decreases significantly while the absorption intensity rises gradually at 7.6 μm (Fig. 5). Hydrogen impurities are effectively removed when Cl2 is employed to purify the chalcogenide glasses for reducing the H—S absorption at 4.1 μm. However, more oxygen impurities are also introduced into the glass due to the hydrophility of Cl2, which enhances the absorption intensity of As—O impurities at 7.6 μm. For further elimination of oxygen impurities, aluminum is introduced into the C3 glass, with the sample signed as C3A. The absorption intensity at 7.6 μm decreases significantly and the mass fraction of oxygen impurities reduces from 1.55% to 0.22% (Fig. 6). There is a linear relationship between the mass fraction of oxygen and absorption coefficient at 7.6 μm in chalcogenide glasses (Fig. 7). The striae of the glass is compared for three samples quenched from three different temperatures of 400, 450, and 500 ℃, and the results show that the sample quenched at 450 ℃ has the best uniformity (Fig. 8). The scattering intensity of these three samples also confirms the above conclusions. The gray values of the scattering image for samples quenched at 450 ℃ are more concentrated in the low grade region, which means that the background scattering intensity at 450 ℃ is the lowest (Fig. 9). The fiber attenuation is 0.150 dB/m, 0.087 dB/m at 4.778 μm for C3 and C3A samples respectively (Fig. 11). A laser power output of 6.10 W is obtained in a single-mode fiber when the input power is 12.30 W at 2.0 μm wavelength. The transmission efficiency is about 50%. The output power of 6.12 W is obtained in a multi-mode fiber when the input power is 10.20 W at 3.8 μm and 4.7 μm wavelength. The transmission efficiency is about 59% (Fig. 13). Conclusions The purification technique of chalcogenide glasses is studied. Cl2 is introduced in chalcogenide glasses to eliminate the hydrogen impurities, and the absorption caused by hydrogen impurities decreases with the Cl2 input volume. However, the As—O absorption intensity rises gradually at 7.6 μm, and the absorption coefficient is linearly proportional to the mass fraction of oxygen. The mass fraction of oxygen impurity in the glass is reduced from 1.55% to 0.22% by introducing the reducing agent aluminum. A detection system is set up for examining the defects in the glass using the scattering technique. The glass quenched at 450 ℃ has the least defects. The glass fiber with a loss of 0.087 dB/m (@4.778 μm) is prepared. The output power of 6.10 W is obtained when the input power is 12.30 W at 2.0 μm wavelength for single-mode fiber, and the transmission efficiency is about 50%. Meanwhile, the transmission efficiency is about 59% for multi-mode fiber at 3.8 μm and 4.7 μm wavelength. The laser damage of the end face is mainly caused by the position deviation generated by thermal expansion, which restricts the transmission power of optical fibers. The transmission power of optical fibers is expected to be further improved by adding a fiber cooling system and reducing energy penetration. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (2) National Key Laboratory of Electromagnetic Space Security, Tianjin; 300308, ChinaPublication Year:2024Volume:44Issue:7Article Number:0716001DOI Link:10.3788/AOS232009數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20241815997418 -
Record 459 of
Title:Research of Induction Delay Line Anode Photon Counting Detector
Author Full Names:Zhang, Rui-Li(1); Liu, Yong-An(1); Zhang, Ya-Long(1,2); Yang, Xiang-Hui(1); Liu, Zhe(1); Su, Tong(1); Zhao, Bao-Sheng(1); Sheng, Li-Zhi(1)Source Title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral AnalysisLanguage:ChineseDocument Type:Journal article (JA)Abstract:In this paper, we developed a photo-counting imaging detector based on the delay-line anode with induction readout, which has the advantages of high sensitivity and large detective area features. This novel detector is expected to be used in space astronomy, bioluminescence and spectral measurement applications. This detector consists of a microchannel plate (MCP) , position-sensitive anode and readout. Among these key parameters, the performance of position-sensitive anode decides the performances of detectors to a large extent. As a charge induction readout delay line anode, the delay line anode decodes the position information of the incident photon by measuring the time delay between two ends of a propagation line. The detector with the anode can obtain high detection sensitivity and a large imaging area. Image charge pickup anode is placed outside the sealed vacuum tube, which not only simplifies the process difficulty of anode production but also improves the detector's reliability. Firstly, An inductive readout delay line anode was designed. We analyzed the influence of different thicknesses and mediums material of the detector on the induction charge of the position-sensitive anode. Then, a method is used to tackle the induction charge of different layers unbalance issue. After that, we designed and fabricated a 40 mmX40 mm position-sensitive anode. The experiment results indicate that the transmission attenuation of the anode output is less than 10% , and the inter-pole crosstalk is less than 3%. Finally, we implemented aphoton-counting imaging experimental system based on this anode. This experimental system provides better than 150um spatial resolution and can promote the theoretical and practical development of large-area array and highly sensitive detector for space astronomical UV spectrum measurement. ? 2024 Science Press. All rights reserved.Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:44Issue:5Start Page:1291-1296DOI Link:10.3964/j.issn.1000-0593(2024)05-1291-06數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20242016104013 -
Record 460 of
Title:Silicon photonic integrated wideband radio frequency self-interference cancellation chip for over-the-air in-band full-duplex communication
Author Full Names:Su, Xinxin(1); Chao, Meng(1); Han, Xiuyou(1); Liang, Han(1); Zhang, Wenfu(2); Fu, Shuanglin(1); Wang, Weiheng(1); Zhao, Mingshan(1)Source Title:ChipLanguage:EnglishDocument Type:Journal article (JA)Abstract:Compared with the traditional frequency division duplex and time division duplex, the in-band full-duplex (IBFD) technology can double the spectrum utilization efficiency and information transmission rate. However, radio frequency (RF) self-interference remains a key issue to be resolved for the application of IBFD. The photonic RF self-interference cancellation (SIC) scheme is endowed with the advantages of wide bandwidth, high amplitude and time delay tuning precision, and immunity to electromagnetic interference. To meet the requirements of the new generation of mobile terminals and satellite payloads, the photonic RF SIC system is desired to be miniaturized, integrated, and low power consumption. In this study, the integrated photonic RF SIC scheme was proposed and demonstrated on a silicon-based platform. By utilizing the opposite bias points of the on-chip dual Mach-Zehnder modulators, the phase inversion relationship for SIC was realized over a broad frequency band. The time delay structure combining the optically switched waveguide and compact spiral waveguide enables continuous tuning of time over a wide bandwidth. The optical amplitude adjuster provides efficient amplitude control with a large dynamic range. After being packaged with optical, direct current, and RF design, the photonic RF SIC chip exhibits the interference cancellation capabilities across L, S, C, X, Ku, K, and Ka bands. In the S and C bands, a cancellation depth exceeding 20 dB was measured across a bandwidth of 4.8 GHz. An impressive cancellation depth of over 40 dB was achieved within a bandwidth of 80 MHz at a central frequency of 2 GHz. For the application of over-the-air IBFD communication at the newly promulgated center frequency of 6 GHz for 5G communication, the cancellation depth of 21.7 dB was demonstrated in the bandwidth of 100 MHz, and the low-power signals of interest were recovered successfully. ? 2024 The Author(s)Affiliations:(1) School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian; 116024, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, ChinaPublication Year:2024Volume:3Issue:4Article Number:100114DOI Link:10.1016/j.chip.2024.100114數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20245217595762 -
Record 461 of
Title:High-efficiency longwave 2085 nm laser output in low-loss Ho3+-doped fluorotellurite glass fiber by 1976 nm in-band pumping
Author Full Names:Feng, Shaohua(1,2); Shen, Yewei(3); Zhu, Jun(1,2); Liu, Chengzhen(1,2); Xu, Yantao(1,2); Xiao, Xusheng(1,2); Guo, Haitao(1,2,4)Source Title:Optics and Laser TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract:High-gain Ho3+-doped optical fibers are imperative exigency for > 2 μm single-mode fiber lasers. Here, we have successfully developed and fabricated a low-loss Ho3+-doped fluorotellurite glass fiber. The high-power laser irradiation tolerance of the fiber was verified, and the end face of Ho3+-doped fluorotellurite glass fiber remained undamaged under a ～ 70 W of 981 nm CW laser irradiation. An unsaturated maximum 6.35 W@2085 nm single-mode laser output with a slope efficiency of 90.4 % was achieved in a 25 cm short fiber by homemade 1976 nm laser in-band pumping. To the best of our knowledge, this is currently the highest slope efficiency reported for Ho3+ doped fluorotellurite fiber lasers to date in a space laser cavity. The effects of the fiber length on the laser threshold, slope efficiency, and output wavelength are further discussed. This work offers valuable insights into prospective candidate materials and scheme designs for the future development of high-efficiency, long-wavelength mid-infrared ～ 2.1 μm fiber lasers. ? 2024 Elsevier LtdAffiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Shaanxi, Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of In-Fiber Integrated Optics, Ministry of Education of China, Harbin Engineering University, Harbin; 150001, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Shanxi, Taiyuan; 030006, ChinaPublication Year:2024Volume:177Article Number:111179DOI Link:10.1016/j.optlastec.2024.111179數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20242116111992 -
Record 462 of
Title:Speckle-correlation-based non-line-of-sight imaging under white-light illumination
Author Full Names:Zhou, Meiling(1); Zhang, Yang(1,2); Wang, Ping(1,4); Li, Runze(1); Peng, Tong(1); Min, Junwei(1); Yan, Shaohui(1); Yao, Baoli(1,2,3)Source Title:Optics and Laser TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract:Non-line-of-sight (NLOS) imaging is attracting extensive attention due to its ability to establish the objects hidden from the direct line-of-sight, which prompts potential applications in autonomous driving, robotic vision, biomedical imaging, and other domains. Various NLOS imaging techniques have been successively demonstrated. In this paper, we propose a speckle-correlation-based method to achieve NLOS imaging under white-light illumination. In the proposed method, we process the raw speckle pattern by incorporating the conventional speckle correlation imaging (SCI) with the Zernike polynomial fitting, named ZPF-SCI method, to enhance the performance of the calculated autocorrelation, a key step to achieve optimal image quality. Experimental results demonstrate that our method is effective even in the presence of ambient light, which circumvents the limitation of the conventional SCI that has to be performed in a darkroom. Furthermore, the proposed ZPF-SCI method is insensitive to the angle that the detector deviates from the vertical plane of the optical axis. The quality of the reconstructed image is still acceptable even if the deviation angle reaches 8 degrees. These superiorities facilitate the practical application of the method. ? 2023 Elsevier LtdAffiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Qingdao Marine Science and Technology Center, Qingdao; 266200, China; (4) Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an; 710049, ChinaPublication Year:2024Volume:170Article Number:110231DOI Link:10.1016/j.optlastec.2023.110231數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20234515010837 -
Record 463 of
Title:Large Field of View and Isotropic Light Sheet Microscopy with Aberration-Free Tunable Foci
Author Full Names:Wang, Yue(1,2); Gong, Jingrui(1,2); Xu, Ning(1,2); Yan, Shaohui(3); Dong, Dashan(1,2); Shi, Kebin(1,2,4,5)Source Title:Laser and Photonics ReviewsLanguage:EnglishDocument Type:Article in PressAbstract:Light-sheet microscopy stands out as a powerful tool in biological imaging due to its exceptional performance in fluorescence imaging. However, achieving both high sectioning performance and a vast field of view (FOV) poses a fundamental challenge in conventional light-sheet microscopy. The light-sheet thickness is typically constrained to 1?μm for a wide FOV, potentially compromising resolution. To address this limitation, an axial scanning light-sheet microscopy (ASLM) technique integrated with aberration-free tunable foci to enable high-NA excitation while maintaining a generous FOV, is introduced. The proposed scheme successfully achieves isotropic resolution of 280?nm in a 3D imaging system, encompassing a FOV of 80 × 80?μm and an impressive imaging speed of 80?ms per frame. These remarkable characteristics underscore the immense potential of ASLM for high- spatiotemporal resolution imaging. ? 2024 Wiley-VCH GmbH.Affiliations:(1) State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing; 100871, China; (2) National Biomedical Imaging Center, Peking University, Beijing; 100871, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences Xi'an, Xi'an; 710119, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (5) Peking University Yangtze Delta Institute of Optoelectronics, Jiangsu, Nantong; 226010, ChinaPublication Year:2024DOI Link:10.1002/lpor.202400214數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20244117178470 -
Record 464 of
Title:Stress-Induced Polarization-Maintaining Large-Mode-Area Photonic Crystal Fibers With Deviation of the Single-Mode Transmission Band and Delocalization of Higher-Order Modes
Author Full Names:Ma, Yuan(1,2); Wan, Rui(1,3); Yang, Huanhuan(2); Li, Yanfu(2); Chen, Chao(1,3); Wang, Pengfei(1)Source Title:IEEE Photonics JournalLanguage:EnglishDocument Type:Journal article (JA)Abstract:The nonlinear effects and laser-induced optical and thermal damage in optical fibers, together with the limitations of beam quality and mode-field area, restrict the power scaling-up of single-mode output for developing high-power fiber lasers in the kilowatt and above range. The design of photonic crystal fibers (PCFs) with large mode areas is an effective way to address this problem. In this paper, the demands and challenges of designing very large-mode-area (VLMA-) PCFs are discussed, including the overall fiber structure design and property simulation, especially the precise definition of single-mode operating conditions of VLMA-PCFs. Finally, an advanced stress-induced polarization-maintaining, Yb-doped, PCF structure with a large mode area realized by introducing both leakage channels and higher order mode-filtering units is proposed and analyzed theoretically, for which a maximum core diameter of 101 μ m and single-mode field diameter of 76.33 μ m at 1064 nm and a birefringence value > 10-4 orders of magnitude are achieved. ? 2009-2012 IEEE.Affiliations:(1) Chinese Academy of Sciences (CAS), State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Xi'an; 710119, China; (2) Air Force Engineering University, Information and Navigation College, Xi'an; 710077, China; (3) University of Chinese Academy of Sciences, Center of Materials Science and Optoelectronics Engineering, Beijing; 100049, ChinaPublication Year:2024Volume:16Issue:3Start Page:1-11Article Number:7101111DOI Link:10.1109/JPHOT.2024.3395776數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20241916047122 -
Record 465 of
Title:Modeling of 1.7-μm and 2.4-μm Dual-Wavelength Pumped 4.3-μm Dysprosium-Doped Chalcogenide Fiber Lasers
Author Full Names:Xiao, Yang(1,2); Cui, Jian(1,2); Xiao, Xusheng(1,2); Xu, Yantao(1,2); Guo, Haitao(1,2)Source Title:IEEE Journal of Quantum ElectronicsLanguage:EnglishDocument Type:Journal article (JA)Abstract:A novel 1.7 μm and 2.4 μm dual-wavelength pumping scheme for a 4.3 μm dysprosium (Dy3+)-doped chalcogenide fiber laser was theoretically demonstrated. It was attributed to the 2.4 μm excited stated absorption (ESA, 6H13/2 ? 6H9/2,6F11/2 transition). Theoretically, when the two pumps were 5 W and 2 W, respectively, a laser power of 1.5 W with an remarkable efficiency of 30.2% was obtained from the homemade Dy3+:Ga0.8As34.2Sb5S60 glass fiber with a loss coefficient of 3 dB/m and a Dy3+ concentration of 3.67 × 1025 ions/m3. Results indicated that the dual-wavelength pumping scheme based on the gain fiber provides a potential way to 4.3 μm dysprosium-doped chalcogenide fiber lasers. ? 1965-2012 IEEE.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics (XIOM), Chinese Academy of Sciences, State Key Laboratory of Transient Optics and Photonics, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Center for Materials Science and Optoelectronics Engineering, Beijing; 100049, ChinaPublication Year:2024Volume:60Issue:2Start Page:1-6Article Number:1600106DOI Link:10.1109/JQE.2024.3350688數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20240315387038 -
Record 466 of
Title:Fundamental and dipole gap solitons and their dynamics in the cubic–quintic fractional nonlinear Schr?dinger model with a PT-symmetric lattice
Author Full Names:Wang, Li(1,2,3); Zeng, Jianhua(3,4,5); Zhu, Yi(1,2)Source Title:Physica D: Nonlinear PhenomenaLanguage:EnglishDocument Type:Journal article (JA)Abstract:The interplay of two linear controlled terms – fractional diffraction and parity-time (PT) symmetric lattice – gives rise to unique and interesting linear Bloch gap structures within where the nonlinear localized gap modes may exist. In this study, we explore the formation and dynamics of one-dimensional gap solitons in the cubic–quintic physical model combining the fractional diffraction and PT symmetric lattice. Two classes of gap solitons, which we name the fundamental gap solitons and dipole ones, are constructed and their stability regions within the first finite gap of the associated linear Bloch spectrum are identified by means of linear-stability analysis and direct perturbed numerical simulations. We stress that the gap solitons are always unstable under the condition of PT symmetry breaking (the imaginary part of which is above 0.5). The excitations of the stable two classes of gap solitons are also investigated by using the adiabatic variation of the system's parameters. The results predicted here shed some light on soliton physics in physical systems with combined fractional diffraction and PT symmetric lattice and the competing nonlinearities. ? 2024Affiliations:(1) Beijing Institute of Mathematical Sciences and Applications, Beijing; 101408, China; (2) Yau Mathematical Sciences Center and Department of Mathematics, Tsinghua University, Beijing; 100084, China; (3) Center for Attosecond Science and Technology, State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, China; (5) Collaborative lnnovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi; 030006, ChinaPublication Year:2024Volume:465Article Number:134144DOI Link:10.1016/j.physd.2024.134144數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20242116134534 -
Record 467 of
Title:Fourier ptychographic microscopy and its applications in whole slide imaging system via feature-domain computational framework
Author Full Names:Pan, An(1,3); Zhang, Shuhe(1,2); Wang, Aiye(1,3)Source Title:Frontiers in Optics, FiO 2024 in Proceedings Frontiers in Optics + Laser Science 2024 (FiO, LS) - Part of Frontiers in Optics + Laser Science 2024Language:EnglishDocument Type:Conference article (CA)Conference Title:2024 Frontiers in Optics, FiO 2024Conference Date:September 23, 2024 - September 26, 2024Conference Location:Denver, CO, United statesAbstract:A feature-domain framework is reported for Fourier ptychographic microscopy, termed FD-FPM, to realize full-FOV reconstruction and reduce the accuracy requirement, achieving data acquisition of 4s/slide at 336nm spatial resolution with the FOV of 4.7mm diameter. ? Optica Publishing Group 2024, ? 2024 The Author(s)Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Department of Precision Instruments, Tsinghua University, Beijing; 100084, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20250417769462 -
Record 468 of
Title:Spectroscopic properties and numerical analysis of novel erbium doped multi-component tellurite glasses
Author Full Names:Wan, Rui(1,2); Guo, Chen(1,2); Li, Xianda(1,2); Wang, Pengfei(1,2)Source Title:Ceramics InternationalLanguage:EnglishDocument Type:Journal article (JA)Abstract:In this paper, Er3+ doped TeO2-ZnF2-BaF2-KF-Ta2O5 tellurite glasses with low hydroxyl content (～0.03 × 10?19 cm?3) were investigated employing both glass composition and glass melting process optimization. The Raman spectra and physical properties were characterized to analyze the structure of the glasses. Under the pumping of 980 nm LD laser, intense up-conversion fluorescence at 1.5 and 2.7 μm of samples and their lifetimes were detected and analyzed, and the related transition mechanisms with gradient-varying Er3+ doping concentrations were discussed. The maximum absorption and emission cross section at 2.7 μm was calculated to be 6.4 × 10?21 cm2 and 6.8 × 10?21 cm2, correspondingly, which were higher than those of traditional tellurite glasses. Using the calculated and measured spectroscopic parameters of bulk tellurite glass, a dual-wavelength pumping model was established to verify the feasibility of mid-infrared laser output in similar tellurite glass fiber. Experimental results support the assertion that the Er3+ doped tellurite glasses hold promise as a candidate laser gain medium for mid-infrared fiber laser systems. ? 2023 Elsevier Ltd and Techna Group S.r.l.Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Shaanxi, Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:50Issue:4Start Page:7168-7176DOI Link:10.1016/j.ceramint.2023.12.085數(shù)據(jù)庫(kù)ID（收錄號(hào)）:20235215291178