Prof. Lijun Wang Profile

Prof. Lijun Wang

at Changchun Univ of Science and Technology

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (73)

Proceedings Article | 9 October 2021 Paper

Development of spectral filter element for terahertz nondestructive testing system

Ye Wang, Xiuhua Fu, Lijun Wang, Yongyi Chen, Zhongyao Zhu, Li Qin, Jinlong Zhang

Proceedings Volume 11906, 1190609 (2021) https://doi.org/10.1117/12.2604008

KEYWORDS: Optical filters, Nondestructive evaluation, Terahertz radiation, Transmittance, Thin films, Terahertz technology, Refractive index, Reflectivity, Annealing, Absorption

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Terahertz nondestructive testing technology is a technology widely used in samples evaluation with the merit of on-site and surface-damage free. Terahertz waves have low quantum energy and are transparent to most non-polar substances, thus, terahertz nondestructive testing has gradually become a research hotspot over the years. However when a femtosecond laser in used as a terahertz excitation source, the excess pump light in the system may cause radiation damage to the measured object. In order to eliminate the impact of residual pump light in the system on the measured object, we designed the spectral filter elements of reflect and terahertz band transmission in the wave bands of 0.80 μm and 1.56 μm, by using Nb₂O₅ and SiO₂ as high and low refractive index materials, respectively. Then we prepared the filter membrane system electron beam evaporation through an ion beam assisted deposition. The influence of annealing process on the growth structure of the films was analyzed according to the AFM test results of Nb₂O₅ monolayer films under different process conditions, and the annealing process parameters were optimized to reduce the influence of surface roughness on the film spectrum. Based on the KIM vibration model (Lorentz extension model), the optical constant dispersion distributions of NB2O5 thin flims prepared under different processing conditions were accurately fitted. The influence of temperature on the refractive index and absorption of Nb₂O₅thin films were analyzed. The deposition temperature was optimized to reduce the absorption of the filter in the wave bands of 0.8 μm and 1.560 μm. By using PE Lambda 1050, the reflectivity of the prepared filter in the wave bands of 0.8 μm and 1.560 μm were tested. The prepared filter was scanned by focusing point by point using a built-up transmission terahertz time domain spectral system. The transmittance of the quartz coated sample relative to the reference signal was calculated by analyzing signals in the frequency domain. The average reflectivity of the prepared spectral filter was 99.9% in both the band of 0.9 μm and 1.560 μm. The transmittance of terahertz frequency 2 THz was 68%, which was almost consistent with the theoretical design values, and could meet the requirements for the terahertz nondestructive testing system's application.

Proceedings Article | 18 December 2019 Paper

Noise and linewidth characterizations of DBR laser based on surface etched high-order Bragg gratings

Chao Chen, Peng Jia, Li Qin, Yong-Yi Chen, Hong Chen, Yong-Qiang Ning, Li-Jun Wang

Proceedings Volume 11334, 113341C (2019) https://doi.org/10.1117/12.2548066

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Proceedings Article | 6 November 2018 Paper

High-power 910 nm vertical-cavity surface-emitting laser arrays for light detection and ranging

Jianwei Zhang, Yongqiang Ning, Kefu Liu, Jian Qiu, Xing Zhang, Yingying Yan, Zhiwen Chen, Hao Wu, Hongbo Zhu, Werner Hofmann, Li Qin, Lijun Wang

Proceedings Volume 10812, 1081219 (2018) https://doi.org/10.1117/12.2502184

KEYWORDS: Vertical cavity surface emitting lasers, LIDAR, Integrated circuits, High power lasers, Resistance, Inductance, Capacitance, Integrated circuit design, Absorption, Sensors

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Proceedings Article | 20 February 2018 Paper

Silicon macroporous arrays with high aspect ratio prepared by ICP etching

Guozheng Wang, Bingchen Yang, Ji Wang, Jikai Yang, Qingduo Duanmu

Proceedings Volume 10697, 106970Y (2018) https://doi.org/10.1117/12.2309909

KEYWORDS: Etching, Silicon, Reactive ion etching, Ions, Plasma, Shape memory alloys, Polymers, Semiconducting wafers, Plasma etching, Oxygen

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Proceedings Article | 19 October 2016 Paper

High efficiency Tm3+-doped fiber seed source of optimum fiber length

Miao Yu, Guang-yong Jin, Ji Wang, Xu Li

Proceedings Volume 10152, 1015205 (2016) https://doi.org/10.1117/12.2243774

KEYWORDS: Fiber lasers, Doping

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Proceedings Article | 4 May 2015 Paper

Edge-emitting diode lasers with narrow circular beam output

Lijie Wang, Cunzhu Tong, Yugang Zeng, Yongqiang Ning, Lijun Wang

Proceedings Volume 9543, 95431D (2015) https://doi.org/10.1117/12.2182314

KEYWORDS: Semiconductor lasers, Waveguides, Quantum wells, Near field optics, Continuous wave operation, Refractive index, High power lasers, Photonic crystals, Resistance, Scanning electron microscopy

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Proceedings Article | 19 September 2013 Paper

850nm vertical cavity surface emitting lasers utilizing the self-planar mesa structure

Jianwei Zhang, Yongqiang Ning, Xing Zhang, Jian Zhang, Lijun Wang

Proceedings Volume 8905, 89050E (2013) https://doi.org/10.1117/12.2032237

KEYWORDS: Vertical cavity surface emitting lasers, Oxides, Resistance, Heat flux, Internal quantum efficiency, Thermal effects, Temperature metrology, Thermal analysis, Quantum wells, Oxidation

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Proceedings Article | 17 September 2013 Paper

Power scaling and beam divergence compression of bottom-emitting vertical-cavity surface-emitting lasers

Xing Zhang, Yongqiang Ning, Jianwei Zhang, Jian Zhang, Jinsheng Zhang, Peng Jia, Xiushan Li, Jingjing Shi, Li Qin, Yun Liu, Cunzhu Tong, Lijun Wang

Proceedings Volume 8904, 89040D (2013) https://doi.org/10.1117/12.2032046

KEYWORDS: Vertical cavity surface emitting lasers, Reflectivity, Oxides, Quantum wells, Continuous wave operation, Thermal effects, Finite element methods, Absorption, Semiconducting wafers

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Proceedings Article | 17 September 2013 Paper

High temperature operating (>80oC) 795-nm VCSEL based on InAlGaAs MQWs active region

Jian Zhang, Yongqiang Ning, Jianwei Zhang, Xing Zhang, Lijun Wang

Proceedings Volume 8904, 89041Q (2013) https://doi.org/10.1117/12.2032212

KEYWORDS: Vertical cavity surface emitting lasers, Quantum wells, 3D modeling, Indium, Temperature metrology, Aluminum, Reflectivity, Atomic clocks, Semiconductors, Finite element methods

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Proceedings Article | 16 May 2013 Paper

High power semiconductor laser beam combining technology and its applications

Lijun Wang, Cunzhu Tong, Hangyu Peng, Jun Zhang

Proceedings Volume 8796, 87961N (2013) https://doi.org/10.1117/12.2012332

KEYWORDS: Semiconductor lasers, Laser applications, Continuous wave operation, High power lasers, Fiber lasers, Laser development, Laser sources, Multiplexing, Fiber couplers

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Proceedings Article | 29 November 2012 Paper

High-power narrow far-field broad-stripe semiconductor lasers with second-order metal grating feedback

Yong Yi Chen, Li Qin, Peng Jia, Yong Qiang Ning, Yun Liu, Li Jun Wang, Jin Long Zhang

Proceedings Volume 8552, 85520E (2012) https://doi.org/10.1117/12.999392

KEYWORDS: Metals, Semiconductor lasers, High power lasers, Diffraction, Diffraction gratings, Continuous wave operation, Holography, Optical lithography, Wet etching, Cladding

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SPIE Journal Paper | 1 March 2011 Open Access

Closure of skin incisions by laser-welding with a combination of two near-infrared diode lasers: preliminary study for determination of optimal parameters

Liming Hu, Biao Wang, Junsheng Cao, Zhenhua Tian, Zhijian Gao, Li Qin, Yun Liu, Lijun Wang, Zhihua Lu, Xiaobo Ma, Xiaodong Wu

JBO, Vol. 16, Issue 03, 038001, (March 2011) https://doi.org/10.1117/12.10.1117/1.3552648

KEYWORDS: Laser welding, Skin, Semiconductor lasers, Laser tissue interaction, Tissues, Laser applications, Wound healing, Continuous wave operation, Biomedical optics, Pulsed laser operation

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Proceedings Article | 13 November 2010 Paper

Theoretical analysis of emission characteristics of second-order distributed feedback semiconductor lasers

Li Qin, Shujuan Ye, Yongsheng Hu, Nan Zhang, Yongqiang Ning, Yun Liu, Lijun Wang

Proceedings Volume 7844, 78440L (2010) https://doi.org/10.1117/12.869078

KEYWORDS: External quantum efficiency, Quantum efficiency, Semiconductor lasers, Numerical simulations, Combustion, Laser damage threshold, Electron beam lithography, Lithium, Mechanics, Physics

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