Meng Wang

National University of Defense Technology

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Baoquan Yao

Harbin Institute of Technology

Jun Zhong

Soochow University

Jian Zhang

University of Electronic Science and Technology of China

Senquan Hou

Beijing Jiaotong University

Liang Li

Chinese Academy of Sciences

Zefeng Wang

Wuhan University

Lihong Chen

Hubei University of Technology

Liangliang Min

Soochow University

Baiyi Wu

National University of Defense Technology

Zhilin Deng

Beijing Jiaotong University

Cooperative Institutions

Harbin Institute of Technology

Soochow University

Shandong University

Chinese Academy of Sciences

State Key Laboratory of Crystal Materials

Beijing Jiaotong University

Shenzhen University

University of Chinese Academy of Sciences

Shenzhen Technology University

National University of Defense Technology

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A modified soil water content measurement technique using actively heated fiber optic sensor

Journal of Rock Mechanics and Geotechnical Engineering (2020)

Meng Wang Li Xu Lihong Chen Senquan Hou Guiyan Wu

Soil water content measurement is critical in practical engineering. The actively heated fiber Bragg grating optic sensor (FBGS) has great potential of multi-point measurement for soil water content measurement in field. In this study, the effect of heating time on the measurement accuracy is discussed, and modifications are made for actively heated fiber optic (AHFO) sensors. The results demonstrate that if an integration data analysis method is used, the accuracy and reliability of soil water content measurement with AHFO sensors will be improved. Both a short fiber length and a short-term heating pattern are effective and can help to reduce soil disturbance. With the proposed integration method, a short heating time is guaranteed for measuring the soil water content. Such improvements will reduce the thermal disturbance to soil sample and improve the reliability of measurement.

Fiber Bragg Grating

10.1016/j.jrmge.2019.11.003

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Citations (24)

Vertical Bridgman growth and characterization of large ZnGeP2 single crystals

Journal of Crystal Growth (2010)

Shixing Xia Meng Wang Chunhui Yang Zuotao Lei Guoli Zhu

Stoichiometry

Crystal (programming language)

10.1016/j.jcrysgro.2010.11.062

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Citations (15)

Visible to near-infrared supercontinuum generation in yttrium orthosilicate bulk crystal and ion implanted planar waveguide

Scientific Reports (2016)

Bingxi Xiang Xikui Ren Shuangchen Ruan Lei Wang Peiguang Yan

Abstract This paper reports on the supercontinuum generation in yttrium orthosilicate bulk crystal and 6-mm-long ion implanted planar waveguide. The waveguide is fabricated by 6 MeV oxygen ions implantation with fluence of 5 × 10 14 ions/cm 2 at room temperature. The yttrium orthosilicate bulk crystal and waveguide are pumped using a mode-locked Ti:Sapphire laser with a center wavelength of 800 nm. The generated broadest supercontinuum spans 720 nm (at −30 dB points) from 380 to 1100 nm in bulk crystal and 510 nm (at −30 dB points) from 490 to 1000 nm in ion implanted waveguide, respectively. Compared to the bulk crystal, the ion implanted waveguide requires almost three orders of magnitude lower pump power to achieve a similar level of broadening. The supercontinuum is generated in the normal dispersion regime and exhibits a relatively smooth spectral shape. Our research findings indicate that ion implantation is an efficient method to produce waveguide in yttrium orthosilicate crystal for low-threshold supercontinuum generation.

Supercontinuum

Crystal (programming language)

Waveguide

10.1038/srep31612

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The Growth and Spectroscopic Properties of Er, Nd: YSGG Single Crystal Fibers

Crystals (2023)

Baiyi Wu Tao Wang Meng Wang Jian Zhang Ning Jia

Single crystal fiber (SCF) is a novel solid gain medium and technique which combines the advantages of glass fiber and single crystal, showing great potential in the field of high-power lasers. In this paper, Er, Nd: YSGG single crystals with diameters of 2 mm and lengths of 80 mm were successfully grown using the micro-pulling-down method for the first time. Then, the measurements of Laue spots and Er3+ distribution indicated that the as-grown crystals were of a high quality. The effect of co-doped Nd3+ on the Er: YSGG was systematically discussed, which demonstrated that Nd3+ can decrease the fluorescence lifetime of Er: 4I13/2 that solve the self-termination bottleneck accordingly. These results demonstrate that Er, Nd: YSGG SCFs are promising materials for the further 3 μm laser generations.

Crystal (programming language)

10.3390/cryst13121646

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Frequency-selective perovskite photodetector for anti-interference optical communications

Nature Communications (2024)

Liangliang Min Haoxuan Sun Linqi Guo Meng Wang Fengren Cao

Abstract Free-space coupling, essential for various communication applications, often faces significant signal loss and interference from ambient light. Traditional methods rely on integrating complex optical and electronic systems, leading to bulkier and costlier communication equipment. Here, we show an asymmetric 2D–3D–2D perovskite structure device to achieve a frequency-selective photoresponse in a single device. By combining two electromotive forces of equal magnitude in the opposite directions, the device output is attenuated to zero under constant light illumination. Because these reverse photodiodes have different response speeds, the device only responds near a certain frequency, which can be tuned by manipulating the 2D perovskite components. The target device achieves an ultrafast response of 19.7/18.3 ns in the frequency-selective photoresponse range 0.8–9.7 MHz. This anti-interference photodetector can accurately transmit character and video data under strong light interference with a source intensity of up to 454 mW cm −2 .

Photodiode

SIGNAL (programming language)

10.1038/s41467-024-46468-5

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Citations (31)