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Passive mode-locked Er-doped fiber laser pulse generation based on titanium disulfide saturable absorber Research Articles

Xinxin Shang, Linguang Guo, Huanian Zhang, Dengwang Li, Qingyang Yue,huanian_zhang@163.com,qingyangyue@sdnu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5,   Pages 615-766 doi: 10.1631/FITEE.2000341

Abstract: In this study, (TiS) polyvinyl alcohol (PVA) film-type (SA) is synthesized with a modulation depth of 5.08% and a saturable intensity of 10.62 MW/cm by liquid-phase exfoliation and spin-coating methods. Since TiS-based SA has a strong nonlinear saturable absorption property, two types of optical soliton were observed in a mode-locked Er-doped . When the pump power was raised to 67.3 mW, a conventional mode-locked pulse train with a repetition rate of 1.716 MHz and a pulse width of 6.57 ps was generated, and the output spectrum centered at 1556.98 nm and 0.466 nm spectral width with obvious Kelly sidebands was obtained. Another type of mode-locked pulse train with the maximum output power of 3.92 mW and pulse energy of 2.28 nJ at the pump power of 517.2 mW was achieved when the polarization controllers were adjusted. Since TiS-based SA has excellent nonlinear saturable absorption characteristics, broad applications in ultrafast photonic are expected.

Keywords： 光纤激光器；被动锁模；可饱和吸收体；二硫化钛    

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Traditional soliton erbium-doped fiber laser with InSe as saturable absorber Research

Xiaojuan Liu, Guomei Wang, Mingxiao Zhu, Kezhen Han, Wenfei Zhang, Huanian Zhang,zhangwenfei@sdut.edu.cn,huanian_zhang@163.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000387

Abstract: Indium selenide (InSe) is a typical layered metal-chalcogenide semiconductor that has potential for developing ultrafast optoelectronic devices. In this work, InSe-polyvinyl alcohol (InSe-PVA) film is employed as saturable absorber and prepared by mixing InSe solution and polyvinyl alcohol solution. The nonlinear absorption properties of the InSe saturable absorber (InSe-SA) are investigated, showing that the nonsaturable absorption and modulation depth are 37.5% and 9.55%, respectively. lasers are generated in erbium-doped fiber (EDF) laser-employed InSe as a mode-locker. The central wavelength and pulse duration of the pulse are 1568.73 nm and 2.06 ps, respectively, under a repetition rate of 1.731 MHz. The maximum average output power is 16.4 mW at the pump power of 413 mW. To the best of our knowledge, this is the first demonstration of a pulse with InSe as a mode-locker. The experimental results further demonstrate that InSe is an outstanding nonlinear absorption material in ultrafast .

Keywords： 光纤激光器；纳米片；传统孤子    

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Generation of noise-like pulses and soliton rains in a graphene mode-locked erbium-doped fiber ring laser Research

Pinghua Tang, Mulin Luo, Ting Zhao, Yuliang Mao,pinghuatang@xtu.edu.cn,1011773923@qq.com,zthaza@126.com,ylmao@xtu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000372

Abstract: We demonstrate the generation of noise-like pulses (NLPs) and soliton rains in a saturable absorber mode-locked erbium-doped fiber laser. Typical NLPs are obtained at a proper pump power and in a cavity polarization state. The soliton rain operation with multiple solitons can be achieved by finely adjusting the cavity polarization state. In addition, distinctive multi-soliton interactions are observed and investigated, including the fundamental mode-locking and multiple pulses. The experimental results can help further understand nonlinear pulse dynamics in ultrafast optics.

Keywords： 掺铒光纤激光器；石墨烯；可饱和吸收体；被动锁模    

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Preparation of ultrathin ReS2 nanosheets and their application to Q-switched Er-doped fiber lasers Research

Junshan He, Guohua Zeng, Shaoxian Liu, Haiming Lu, Ruixian Xie, Jingjing Qi, Lili Tao, Bo Zhou,taoll@gdut.edu.cn,zhoubo@scut.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000339

Abstract: We study the exfoliation of ultrathin ReS nanosheets from the prepared ReS powder and their application to Q-switched Er-doped fiber laser. XRD, Raman, and XPS spectra confirm the successful preparation of the layered ReS. SEM images show that the obtained ReS sheets have lateral size below 200 nm. The thickness of the ReS nanosheets is smaller than 5 nm according to the AFM results. ReS/PVA film is applied as a in an Er-doped , and a minimum pulse duration of 2.4 μs and an output power of 1.25 mW are obtained, indicating the potential application to Q-switched lasers.

Keywords： 二硫化铼；可饱和吸收体；二维材料；调Q光纤激光器    

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2.3 μm nanosecond passive Q-switching of an LD-pumped Tm:YLF laser using gold nanorods as a saturable absorber Research

Fu-yan Wu, Shi-qiang Wang, Hai-wei Chen, Hai-tao Huang,wfyjsnu@126.com,wsq274412@126.com,haiwei0819@163.com,hht840211@163.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 312-317 doi: 10.1631/FITEE.2000110

Abstract: Developing new saturable absorbers for use in the mid-infrared region has practical significance for short-pulsed lasers and related scientific and industrial applications. The performance of (GNRs) as saturable absorbers at novel mid-infrared wavelengths needs to be evaluated even though these benefit from ultrafast nonlinear responses and broadband saturable absorption. of an LD-pumped Tm:YLF laser using GNRs was successfully realized in this study. Pulses with an 843 ns pulse width and a 6.67 kHz repetition rate were achieved using this Q-switched laser. Results showed that GNRs provide promising passive Q-switches for Tm-doped lasers.

Keywords： Gold nanorods     Passive Q-switching     2.3 μm     Tm-doped laser materials    

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The Consolidation of Highly Saturated Soils and Saturation Degree's Influence

Jin Zhigao

Strategic Study of CAE 2004, Volume 6, Issue 9,   Pages 73-76

Abstract:

Based on Terzaghi's consolidation theories and Biot's consolidation theories, the consolidating mechanism and consolidating process of highly saturated soil are discussed according to the variety of saturation degree. The influence of saturation degree changing on porous fluid compressibility as well as the whole consolidation process are studied deeply in this paper.

Keywords： consolidation     saturated degree     elasticity modulus     compressing    

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The Principle of Interaction Between Plastic Volumetric and Shear Strains for Unsaturated Soils

Wang Jingtao

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 11-15

Abstract:

In this paper,  the principle of interaction between plastic volumetric and shear strains for rock and soil has been extended to the field of unsaturated soils.  Two new interactions of suction-plastic volumetric strain and pore air pressure-plastic volumetric strain appear in the unsaturated state of a soil besides the interaction between plastic volumetric and shear strains.  The suction possesses a dual property. Thereby the effect of the suction on plastic volumetric strain includes two opposite aspects.  By means of this property of suction,  the physical significance of effective stress parameter,  effects of suction on volume change and preconsolidation pressure,  and the mechanism of collapse upon wetting all can be explained.  In addition,  it is theoretically proved by application of this principle of interaction that the critical state line for unsaturated soils exists,  and is unique and independent of the stress history.

Keywords： the principle of interaction between plastic volumetric and shear strains     unsaturated soil     matric suction     the principle of effective stress    

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Pattern reconfigurable antenna array for 5.8 GHz WBAN applications

杨凌升,王斌,李雅洁

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 9,   Pages 1357-1365 doi: 10.1631/FITEE.2200542

Abstract: 本文提出一种适用于5.8 GHz WBAN应用的方向图可重构天线阵列。天线阵列由辐射组件和控制网络组件组成。辐射组件包括4个平面F型天线，它们位于上层的4个角上，彼此逆时针旋转90°。控制网络组件位于底层，包括一个4端口可控网络。通过控制集成在可控网络中的PIN二极管，可以获得与人体表面相切的全向辐射图和与人体表面垂直的定向辐射图。我们测量了阵列安装在人体或前臂假体上时的阻抗带宽、辐射模式和增益，实验结果与仿真结果一致。同时仿真了两种辐射模式下的电磁波吸收比值（SAR）和波束切换能力，以确保该阵列的实用性。

Keywords： 无线体域网     方向图可重构     PIN二极管     控制网络     比吸收率    

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The Analysis of Dangerous Volumetric Water Content of Unsaturated Soil Slope

Zhang Shilin,Wang Dongmei,Li Genhua

Strategic Study of CAE 2004, Volume 6, Issue 5,   Pages 71-75

Abstract:

This article mainly formulates that rainfall seeping makes the volumetric water of unsaturated soil changing, and the water content relates closely to soil suction. That means soil suction changes with the stability of whole unsaturated soil slope, that is, the safety coefficient has some relationship with volumetric water. So the “dangerous” volumetric water condition cna be determined under which, the unsaturated soil slope also is danger. By monitoring the volumetric water condition changing of unsaturated soil slope, some information of unsaturated soil slope stability can be obtained.

Keywords： unsaturated soil     stability analysis     rainfall seeping     volumetric water     soil suction    

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The progress of membrane adsorption and absorption

Lin Ligang,Ye Hui,Zhao Lizhi,Ding Xiaoli,Zhang Yuzhong

Strategic Study of CAE 2014, Volume 16, Issue 12,   Pages 59-66

Abstract:

During recent years， membrane integration process has attracted wide attentions. The study on combination of the traditional separation technology and membrane process is conducive to the advantages such as high efficiency， easy online， etc. It is significant for the large-scale application of membrane integration process with low cost. Membrane adsorption and membrane absorption processes， which combined the advantages of membranes with adsorption， gained wide?applications for numerous occasions such as purification and separation. The research advances and development tendency of membrane adsorption and absorption will be introduced in this article， which can provide some suggestions for the researchers of related fields.

Keywords： membrane     membrane adsorption     membrane absorption    

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Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film Article

Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan

Engineering 2023, Volume 29, Issue 10,   Pages 198-206 doi: 10.1016/j.eng.2022.10.005

Abstract:

Transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal, although having a fixed absorption performance limits their applicability. Here, a simple, transparent, and thermally tunable microwave absorber is proposed, based on a patterned vanadium dioxide (VO2) film. Numerical calculations and experiments demonstrate that the proposed VO2 absorber has a high optical transmittance of 84.9% at 620 nm; its reflection loss at 15.06 GHz can be thermally tuned from –4.257 to –60.179 dB, and near-unity absorption is achieved at 523.75 K. Adjusting only the patterned VO2 film duty cycle can change the temperature of near-unity absorption. Our VO2 absorber has a simple composition, a high optical transmittance, a thermally tunable microwave absorption performance, a large modulation depth, and an adjustable temperature tuning range, making it promising for application in tunable sensors, thermal emitters, modulators, thermal imaging, bolometers, and photovoltaic devices.

Keywords： Tunable microwave absorber     VO2 film     Optical transparent     Near unity absorption     Large modulation depth    

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cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma

Tan Xinjian,Ouyang Xiaoping,Wang Qunshu

Strategic Study of CAE 2009, Volume 11, Issue 8,   Pages 48-51

Abstract:

This paper proposes a new method of diagnosing 16.7 MeV high-energy pulsed gamma, named "scattering-absorbing method" . The ratio of the sensitivity of HEG to that of the LEG can reach 106 to 108 by this new method. The sensitivity of 16.7 MeV high-energy gamma ranges from 10-21 to 10-16 C·cm2. It's better than the traditional method which bases on the magnetic analyzer and Cherenkov detector on some aspects.

Keywords： high-energy gamma     Cherenkov detector     scattering absorption method    

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Graphene-metasurface for wide-incident-angle terahertz absorption Research

Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3,   Pages 287-436 doi: 10.1631/FITEE.2000079

Abstract: We demonstrate a structure for tunable wide-incident-angle terahertz wave absorption, which involves depositing planar arrays of on a silicon dioxide substrate. We also discuss how the graphene Fermi-level layer and various substrates affect the absorption characteristics. The absorption of the proposed is above 80% at an incident angle of 0°–60° in frequencies ranging from 0.82 to 2.0 THz. Our results will be very beneficial in the application of terahertz wave communications and biomedical imaging/sensing systems.

Keywords： 石墨烯超表面；太赫兹吸收器；欧米伽形石墨烯图案    

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A Novel Hierarchically Lightweight Porous Carbon Derived from Egg White for Strong Microwave Absorption Article

Zonglin Liu, Xu Zhao, Liangliang Xu, Qingyu Peng, Xiaodong He

Engineering 2022, Volume 18, Issue 11,   Pages 161-172 doi: 10.1016/j.eng.2022.04.026

Abstract:

Egg custard is a common dish on the dining table and exhibits a uniform porous structure after freeze-drying. The protein within egg custard is a rich source of carbon and nitrogen, and the custard's unique microstructure and adjustable electrical properties make it a potential porous carbon precursor. Herein, nitrogen in situ doped porous carbons (NPCs) and potassium-carbonate-modified NPCs (PNPCs) are obtained through a simple gelation and carbonization process using egg white as the raw material. The unique morphologies of the porous carbon are inherited from the protein and include fibrous clusters, honeycomb holes, and a grooved skeleton. Their excellent impedance matching and effective internal loss make the obtained porous carbons good candidates for lightweight electromagnetic (EM) wave absorbers without the need to dope with metal elements. As a representative porous carbon, PNPC10-700 has multiple structures, including fibrous clusters, honeycomb holes, and a porous skeleton. Moreover, it achieves a maximum reflection loss value of −66.15 dB (with a thickness of 3.77 mm) and a broad effective absorption bandwidth of 5.82 GHz (from 12.18 to 18.00 GHz, with a thickness of 2.5 mm), which surpasses the reported values in most of the literature. Thus, gelation combined with the further carbonization of egg white (protein) is a new method for designing the morphology and EM properties of porous carbon absorbers.

Keywords： Microwave absorption     Porous carbon     Biomass     K2CO3    

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Stability analysis of uncertain fractional-order neutral-type delay systems with actuator saturation Research Articles

Zahra Sadat Aghayan, Alireza Alfi, J. A. Tenreiro Machado,a_alfi@shahroodut.ac.ir

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 10,   Pages 1402-1412 doi: 10.1631/FITEE.2000438

Abstract: This study analyzes the problem of of fractional-order delay systems of neutral type under actuator . A Lyapunov–Krasovskii (LK) function is constructed and conditions of the asymptotic of such systems are given, which are formulated by linear matrix inequalities (LMIs), using the Lyapunov direct method. An algorithm is introduced to compute the gain of the state feedback controller for extending the domain of attraction. The theoretical results are validated using some numerical examples.

Keywords： 分数阶系统；稳定性；中立时滞；鲁棒性；饱和性    

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Title Author Date Type Operation

Passive mode-locked Er-doped fiber laser pulse generation based on titanium disulfide saturable absorber

Xinxin Shang, Linguang Guo, Huanian Zhang, Dengwang Li, Qingyang Yue,huanian_zhang@163.com,qingyangyue@sdnu.edu.cn

Journal Article

Traditional soliton erbium-doped fiber laser with InSe as saturable absorber

Xiaojuan Liu, Guomei Wang, Mingxiao Zhu, Kezhen Han, Wenfei Zhang, Huanian Zhang,zhangwenfei@sdut.edu.cn,huanian_zhang@163.com

Journal Article

Generation of noise-like pulses and soliton rains in a graphene mode-locked erbium-doped fiber ring laser

Pinghua Tang, Mulin Luo, Ting Zhao, Yuliang Mao,pinghuatang@xtu.edu.cn,1011773923@qq.com,zthaza@126.com,ylmao@xtu.edu.cn

Journal Article

Preparation of ultrathin ReS2 nanosheets and their application to Q-switched Er-doped fiber lasers

Junshan He, Guohua Zeng, Shaoxian Liu, Haiming Lu, Ruixian Xie, Jingjing Qi, Lili Tao, Bo Zhou,taoll@gdut.edu.cn,zhoubo@scut.edu.cn

Journal Article

2.3 μm nanosecond passive Q-switching of an LD-pumped Tm:YLF laser using gold nanorods as a saturable absorber

Fu-yan Wu, Shi-qiang Wang, Hai-wei Chen, Hai-tao Huang,wfyjsnu@126.com,wsq274412@126.com,haiwei0819@163.com,hht840211@163.com

Journal Article

The Consolidation of Highly Saturated Soils and Saturation Degree's Influence

Jin Zhigao

Journal Article

The Principle of Interaction Between Plastic Volumetric and Shear Strains for Unsaturated Soils

Wang Jingtao

Journal Article

Pattern reconfigurable antenna array for 5.8 GHz WBAN applications

杨凌升,王斌,李雅洁

Journal Article

The Analysis of Dangerous Volumetric Water Content of Unsaturated Soil Slope

Zhang Shilin,Wang Dongmei,Li Genhua

Journal Article

The progress of membrane adsorption and absorption

Lin Ligang,Ye Hui,Zhao Lizhi,Ding Xiaoli,Zhang Yuzhong

Journal Article

Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film

Zhengang Lu, Yilei Zhang, Heyan Wang, Chao Xia, Yunfei Liu, Shuliang Dou, Yao Li, Jiubin Tan

Journal Article

cattering-absorbing method for the detection of 16.7 MeV high-energy pulsed gamma

Tan Xinjian,Ouyang Xiaoping,Wang Qunshu

Journal Article

Graphene-metasurface for wide-incident-angle terahertz absorption

Ri-hui Xiong, Xiao-qing Peng, Jiu-sheng Li,lijsh2008@126.com

Journal Article

A Novel Hierarchically Lightweight Porous Carbon Derived from Egg White for Strong Microwave Absorption

Zonglin Liu, Xu Zhao, Liangliang Xu, Qingyu Peng, Xiaodong He

Journal Article

Stability analysis of uncertain fractional-order neutral-type delay systems with actuator saturation

Zahra Sadat Aghayan, Alireza Alfi, J. A. Tenreiro Machado,a_alfi@shahroodut.ac.ir

Journal Article