Prof. Liqun Sun Profile

Prof. Liqun Sun

at Tsinghua Univ

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 13 March 2024 Presentation + Paper

Long-term in vivo visualization of cortical blood perfusion after photothrombotic stroke with needle-shaped beam optical coherence tomography angiography

Xiangyu Guo, Jingjing Zhao, Adam de la Zerda, Liqun Sun

Proceedings Volume 12830, 128300T (2024) https://doi.org/10.1117/12.2692776

KEYWORDS: Diffractive optical elements, Optical coherence tomography, Visualization, Brain, Blood, In vivo imaging, Gaussian beams, Angiography, Image processing

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Proceedings Article | 12 March 2024 Presentation + Paper

Wearable optical coherence tomography angiography probe for monitoring mouse brain in vivo

Xiangyu Guo, Xiaochen Li, Yong Huang, Jingjing Zhao, Liqun Sun

Proceedings Volume 12846, 1284606 (2024) https://doi.org/10.1117/12.3001185

KEYWORDS: Brain, Optical coherence tomography, Neuroimaging, Biological imaging, Imaging systems, Image resolution, Angiography, Optical sensing, Microelectromechanical systems, In vivo imaging

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Proceedings Article | 27 November 2023 Poster + Paper

Large depth-of-field and high-resolution optical coherence tomography angiography with a needle-shaped beam

Xiangyu Guo, Jingjing Zhao, Adam de la Zerda, Liqun Sun

Proceedings Volume 12770, 127701V (2023) https://doi.org/10.1117/12.2686500

KEYWORDS: Diffractive optical elements, Depth of field, Optical coherence tomography, Angiography, Brain, Imaging systems, Image resolution, Neuroimaging, Biological imaging, Airy beams

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Proceedings Article | 17 April 2020 Paper

Based on hyperspectral polarization to build the quantitative remote sensing model of jujube in Southern Xinjiang

Huaping Luo, liqun sun, Luying Yi, Ling Guo, Wei Li

Proceedings Volume 11455, 1145566 (2020) https://doi.org/10.1117/12.2565213

KEYWORDS: Polarization, Dielectric polarization, Remote sensing, Reflection, Calibration, Hyperspectral imaging, Image processing, Satellites, Specular reflections, Light sources and illumination

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Proceedings Article | 17 April 2020 Paper

Study on quality distribution characteristics of jujube canopy based on multi-angle hyperspectral polarization

Huaping Luo, liqun sun, Mingli Zou, Ling Guo, Wei Li

Proceedings Volume 11455, 114554G (2020) https://doi.org/10.1117/12.2564910

KEYWORDS: Polarization, Scattering, Refractive index, Light scattering, Remote sensing, Signal detection, Interference (communication), Hyperspectral simulation, Image enhancement, Principal component analysis

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Proceedings Article | 12 January 2018 Paper

Temporal coupled mode theory for all-dielectric perfect absorbers

Xianshun Ming, Willie J. Padilla, Liqun Sun, Huaidong Yang

Proceedings Volume 10622, 1062205 (2018) https://doi.org/10.1117/12.2288506

KEYWORDS: Absorption, Resonators, Metamaterials, Terahertz radiation, Electromagnetism

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SPIE Journal Paper | 27 October 2017 Open Access

Multifocal spectral-domain optical coherence tomography based on Bessel beam for extended imaging depth

Luying Yi, Liqun Sun, Wuwen Ding

JBO, Vol. 22, Issue 10, 106016, (October 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.10.106016

KEYWORDS: Optical coherence tomography, Signal to noise ratio, Bessel beams, Axicons, Sun, Image resolution, Gaussian beams, Tissues, Biomedical optics, Imaging systems

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Proceedings Article | 23 August 2017 Paper

Frequency division multiplexing THz light field imaging

Xianshun Ming, Willie Padilla, Liqun Sun

Proceedings Volume 10383, 103830V (2017) https://doi.org/10.1117/12.2282078

KEYWORDS: Spatial light modulators, Terahertz radiation, Frequency division multiplexing, Imaging systems, Tunable metamaterials, Computational imaging, Metamaterials

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Proceedings Article | 3 February 2015 Paper

Radiative characteristics of high-power halogen tungsten lamp used in calibration of high-energy laser energy meter

Ji Feng Wei, Yan Chang, Li Qun Sun, Kai Zhang, Xiao Yang Hu, Zi Jie Sha

Proceedings Volume 9255, 92554S (2015) https://doi.org/10.1117/12.2065119

KEYWORDS: Lamps, Tungsten, Halogens, Calibration, Laser energy, Energy efficiency, High power lasers, Sensors, Absorption, Laser applications

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Proceedings Article | 22 June 2013 Paper

An on-line monitoring technique for trace gases in atmosphere based on differential optical absorption spectroscopy

L. Sun, K. Cheng, H. Yang, Q. He

Proceedings Volume 8769, 87692Z (2013) https://doi.org/10.1117/12.2021110

KEYWORDS: Absorption, Gases, Atmospheric optics, Atmospheric monitoring, Absorption spectroscopy, Lamps, Spectroscopic atmospheric monitoring techniques, Spectroscopy, NOx, Light sources

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Proceedings Article | 5 September 2006 Paper

CCD on-chip imaging for smart micro-object and fluorescence imaging system

Hongyun Qiu, Yang Liu, Liqun Sun, Enyao Zhang, Qian Tian

Proceedings Volume 6289, 628913 (2006) https://doi.org/10.1117/12.679977

KEYWORDS: Charge-coupled devices, Imaging systems, CCD image sensors, Luminescence, Microscopes, Sensors, Image resolution, Geometrical optics, Objectives, Beam propagation method

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SPIE Journal Paper | 1 May 2006

End-pumped continuous-wave passively mode-locked Nd:YVO₄ laser with low pump power

Yang Liu, Liqun Sun, Yonggang Wang, Hongyun Qiu, Qian Tian, Xiaoyu Ma

OE, Vol. 45, Issue 05, 054201, (May 2006) https://doi.org/10.1117/12.10.1117/1.2202645

KEYWORDS: Mode locking, Continuous wave operation, Laser crystals, Crystals, Solid state lasers, Mirrors, Semiconductor lasers, Q switched lasers, Modes of laser operation, Laser applications

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Proceedings Article | 5 December 2005 Paper

Rotation sensitivity self-modulation in bi-directional CW Nd:YVO4 ring laser

Hongyun Qiu, Yang Liu, Liqun Sun, Qian Tian

Proceedings Volume 6020, 60202P (2005) https://doi.org/10.1117/12.635743

KEYWORDS: Modulation, Continuous wave operation, Neodymium lasers, Gyroscopes, Mirrors, Semiconductor lasers, Sensors, Crystals, Diodes, Laser systems engineering

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Proceedings Article | 3 June 2005 Paper

Research on multiple-integrated-optic-chip of re-entrant fiber optic gyro

Xianhui Mao, Qian Tian, Enyao Zhang, Liqun Sun, Yunhe Teng, Jinjiang Liu

Proceedings Volume 5826, (2005) https://doi.org/10.1117/12.605020

KEYWORDS: Fiber optic gyroscopes, Modulation, Light, Phase shift keying, Electrodes, Light sources, Mach-Zehnder interferometers, Optical components, Signal processing, Modulators

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Proceedings Article | 14 February 2005 Paper

Research on signal detection of re-entrant fiber optic gyroscope

Xianhui Mao, Qian Tian, Liqun Sun, Yanshen Zhang, Xiaoming Wu, Jinjiang Liu

Proceedings Volume 5634, (2005) https://doi.org/10.1117/12.573536

KEYWORDS: Signal detection, Fiber optic gyroscopes, Signal processing, Modulation, Gyroscopes, Light, Light sources, Demodulation, Interferometry, Optical components

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Proceedings Article | 26 January 2005 Paper

Study on simultaneous passive Q-switching and mode-locking at low-pump power in a LD-pumped Nd3+:YVO4-Cr4+:YAG laser

Yang Liu, Hongyun Qiu, Liqun Sun, Qian Tian

Proceedings Volume 5627, (2005) https://doi.org/10.1117/12.573704

KEYWORDS: Q switching, Mode locking, YAG lasers, Chromium, Q switches, Neodymium, Laser crystals, Mirrors, Modulation, Crystals

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Proceedings Article | 9 September 2004 Paper

Near-field optical virtual probe based on SIL for optical data storage

Jia Wang, Tao Hong, Liqun Sun, Dacheng Li

Proceedings Volume 5380, (2004) https://doi.org/10.1117/12.552924

KEYWORDS: Near field, Near field optics, Optical storage, Diffraction, Interfaces, Data storage, Solids, Data modeling, Near field scanning optical microscopy, 3D modeling

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Proceedings Article | 12 May 2004 Paper

Experimental research on the stability and the multilongitudinal mode interference of bidirectional outputs of LD-pumped solid state ring laser

Shunping Wan, Qian Tian, Liqun Sun, Minyan Yao, Xianhui Mao, Hongyun Qiu

Proceedings Volume 5280, (2004) https://doi.org/10.1117/12.520362

KEYWORDS: Solid state lasers, Laser stabilization, Semiconductor lasers, Mirrors, Transmission electron microscopy, Solid state electronics, Continuous wave operation, Sensors, Solid state physics

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Proceedings Article | 17 September 2002 Paper

Detection of optical field by near-field scanning optical microscopy

Tiejun Xu, Jiying Xu, Jia Wang, Dong Pan, Liqun Sun, Qian Tian

Proceedings Volume 4930, (2002) https://doi.org/10.1117/12.483336

KEYWORDS: Near field scanning optical microscopy, Near field optics, Near field, Optical storage, Optical resolution, Objectives, Nonlinear optics, Diffraction, Solids, Optical properties

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Proceedings Article | 5 September 2002 Paper

Aperture design and analysis of nano-aperture laser

Tiejun Xu, Jiying Xu, Jia Wang, Liqun Sun, Qian Tian

Proceedings Volume 4923, (2002) https://doi.org/10.1117/12.481709

KEYWORDS: Near field, Near field optics, Metals, Light sources, Optical storage, Finite-difference time-domain method, Semiconductor lasers, Polarization, Electromagnetism, Data storage

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Proceedings Article | 5 September 2002 Paper

Longitudinal-mode analysis and selection of the bidirectional LD-pumped solid ring laser

Zhili Zhang, Liqun Sun, Qian Tian

Proceedings Volume 4913, (2002) https://doi.org/10.1117/12.482203

KEYWORDS: Fabry–Perot interferometers, Crystals, Gyroscopes, Solids, Semiconductor lasers, Laser crystals, Solid state lasers, Laser resonators, Mirrors, Resonators

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Proceedings Article | 5 September 2002 Paper

Near-field optical virtual probe based on evanescence wave interference and nano-aperture

Tao Hong, Jia Wang, Liqun Sun, Dacheng Li

Proceedings Volume 4923, (2002) https://doi.org/10.1117/12.481724

KEYWORDS: Near field, Near field optics, Diffraction, Interfaces, Polarization, Optical storage, Finite-difference time-domain method, Near field scanning optical microscopy, Solids, Optical imaging

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Proceedings Article | 5 September 2002 Paper

Experimental research on the diode-pumped solid-state ring laser

Shunping Wan, Liqun Sun, Xianhui Mao, Qian Tian

Proceedings Volume 4913, (2002) https://doi.org/10.1117/12.482204

KEYWORDS: Gyroscopes, Semiconductor lasers, Mirrors, Solid state lasers, Crystals, Laser crystals, Neodymium lasers, Waveguides, Solid state physics, Solid state electronics

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Proceedings Article | 10 January 2002 Paper

Numerical simulation of electromagnetic propagation in super-resolution near-field structure

Liqun Sun, Tao Hong, Jia Wang, Qian Tian

Proceedings Volume 4342, (2002) https://doi.org/10.1117/12.453404

KEYWORDS: Near field, Near field optics, Radio propagation, Super resolution, Optical storage, Nonlinear optics, Numerical simulations, Diffraction, Computer simulations, Germanium antimony tellurium

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Proceedings Article | 4 November 1999 Paper

Absolute measurement of photodetector quantum efficiency based on spontaneous parametric down-conversion biphoton field

Liqun Sun, Yanpeng Zhang, Tiantong Tang, Zhaojin Yang, Xiqi Hou

Proceedings Volume 3898, (1999) https://doi.org/10.1117/12.368497

KEYWORDS: Photons, Sensors, Quantum efficiency, Photodetectors, Signal detection, Calibration, Crystals, Light sources, Silicon, Signal processing

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Proceedings Article | 11 August 1998 Paper

Performance of imaging photon-counting intensifiers

Liqun Sun, Tiantong Tang, Zhaojin Yang, Shiming Xiang

Proceedings Volume 3553, (1998) https://doi.org/10.1117/12.318068

KEYWORDS: Microchannel plates, Photon counting, Electrons, Cadmium, Electronics, Temperature metrology, Optical filters, Integrating spheres, Sun, Heart

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Showing 5 of 26 publications

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