Prof. Hongjun Liu Profile

Prof. Hongjun Liu

at Xi'an Institute of Optics and Precision Mechanics

SPIE Involvement:

Author

Publications (14)

SPIE Journal Paper | 12 December 2023

Star-8QAM to PAM4 format conversion in highly nonlinear silicon-PTS waveguides

Xiao Wu, Xuefeng Li, Li Ren, Hongjun Liu

OE, Vol. 62, Issue 12, 125103, (December 2023) https://doi.org/10.1117/12.10.1117/1.OE.62.12.125103

KEYWORDS: Waveguides, Silicon, Modulation, Optical transmission, Phase shift keying, Dispersion, Optical engineering, Phase shifts, Receivers, Optical networks

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SPIE Journal Paper | 9 December 2020 Open Access

Using Cherenkov imaging to monitor the match line between photon and electron radiation therapy fields on biological tissue phantoms

Yi Li, Hongjun Liu, Nan Huang, Zhaolu Wang, Chunmin Zhang

JBO, Vol. 25, Issue 12, 125001, (December 2020) https://doi.org/10.1117/12.10.1117/1.JBO.25.12.125001

KEYWORDS: Radiotherapy, Tissue optics, Natural surfaces, Breast cancer, Tissues, Charge-coupled devices, Breast, Chest, Lymphatic system, Electron transport

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Significance: Due to patients’ respiratory movement or involuntary body movements during breast cancer radiotherapy, the mismatched adjacent fields in surface exposure regions could result in insufficient dosage or overdose in these regions, which would lead to tissue injury, excessive skin burns, and potential death. Cherenkov luminescence imaging (CLI) could be used to effectively detect the matching information of adjacent radiation fields without extra radiation or invasive imaging. Aim: Our objective was to provide a biological experimental basis for monitoring matching of adjacent radiation fields between photon and electron fields due to introduced shifts during radiotherapy by CLI technique. Approach: A medical accelerator was used to generate photon and electron fields. An industrial camera system was adopted to image the excited CLI signal during irradiation of chicken tissue with yellow (group A and group C experiments) or black color (group B experiment). The following introduced shifts were tested: 10, 5, 2, and 0 mm toward superior or inferior direction. A model was introduced to deal with matching error analysis of adjacent radiation fields due to introduced shifts with adapted plans used to treat neoplasms of the right breast with supraclavicular nodes or internal mammary lymph node. Results: The matching values between photon and electron fields were consistent with the tested introduced shifts during yellow chicken irradiation. In group A, average discrepancies were 0.59 ± 0.35 mm and 0.68 ± 0.37 mm for photon fields and electron fields in anterior/posterior (AP) direction, with 87% and 75% of measurement within 1 mm, respectively. In group C, average discrepancies were 0.80 ± 0.65 mm and 1.07 ± 0.57 mm for oblique photon field with gantry angles of 330 deg and 150 deg, with 66% and 65% of measurement within 1 mm, respectively. The average discrepancies were 0.44 ± 0.30 mm for electron field in the AP direction, with 94% of measurement within 1 mm. The matching error introduced by the proposed method was less than 1.5 mm for AP fields and 2 mm for oblique incidence fields. However, the field matching could not be monitored with black chicken tissue irradiation due to a weak CLI signal that could hardly be extracted from background noise in group B. Conclusions: CLI is demonstrated for the quantitative monitoring of the field match line on light biological tissue phantoms and has potential for monitoring of field matching in surface tissue during breast cancer radiotherapy.

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SPIE Journal Paper | 9 April 2019

Random scattering of images and visibility enhancement via stochastic resonance

Yongbin Zhang, Hongjun Liu, Nan Huang, Zhaolu Wang

OE, Vol. 58, Issue 04, 046105, (April 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.4.046105

KEYWORDS: Scattering, Visibility, Resonance enhancement, Photons, Interference (communication), Stochastic processes, Light scattering, Particles, Absorption, Scattering media

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SPIE Journal Paper | 12 October 2017

Midinfrared wavelength conversion in hydrogenated amorphous silicon waveguides

Jiang Wang, Zhaolu Wang, Nan Huang, Jing Han, Yongfang Li, Hongjun Liu

OE, Vol. 56, Issue 10, 107103, (October 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.10.107103

KEYWORDS: Waveguides, Dispersion, Amorphous silicon, Nonlinear optics, Silicon, Four wave mixing, Optical engineering, Lithium, Refractive index, Absorption

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Proceedings Article | 5 September 2014 Paper

High-efficiency terahertz-wave generation in silicon membrane waveguides

Hongjun Liu, Zhaolu Wang, Nan Huang, Qibing Sun

Proceedings Volume 9199, 91990D (2014) https://doi.org/10.1117/12.2060232

KEYWORDS: Waveguides, Silicon, Terahertz radiation, Dispersion, Mid-IR, Refractive index, Cladding, Nonlinear crystals, Absorption, Phase matching

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SPIE Journal Paper | 25 June 2014

Effects of various room temperatures on terahertz radiation via optical parametric oscillator

Nan Huang, Hongjun Liu, Qibing Sun

OE, Vol. 53, Issue 06, 066112, (June 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.6.066112

KEYWORDS: Terahertz radiation, Crystals, Nonlinear crystals, Optical parametric oscillators, Laser crystals, Surface finishing, Oscillators, Optical engineering, Laser scattering, Scattering

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SPIE Journal Paper | 22 February 2012

Generation of broadband cascaded four-wave mixing products in silicon-on-insulator waveguide

Jin Wen, Hongjun Liu, Nan Huang, Qibing Sun, Wei Zhao

OE, Vol. 51, Issue 02, 024601, (February 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.2.024601

KEYWORDS: Waveguides, Dispersion, Silicon, Picosecond phenomena, Four wave mixing, Photons, Optical fibers, Cladding, Nonlinear optics, Optical engineering

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SPIE Journal Paper | 1 August 2011

Ultrawide tunable femtosecond optical parametric oscillator around 1.5 μm based on high nonlinear photonic crystal fiber

Jin Wen, Hongjun Liu, Nan Huang, Qibing Sun, Hanbo Long

OE, Vol. 50, Issue 08, 085001, (August 2011) https://doi.org/10.1117/12.10.1117/1.3606497

KEYWORDS: Dispersion, Optical parametric oscillators, Femtosecond phenomena, Nonlinear optics, Photonic crystal fibers, Oscillators, Nonlinear crystals, Ultrafast phenomena, Modulation, Computer simulations

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Proceedings Article | 10 February 2009 Paper

Generation of fiber tunable high-power picosecond laser pulse

Hongjun Liu, Cunxiao Gao, Jintao Tao, Wei Zhao, Yishan Wang

Proceedings Volume 7126, 712618 (2009) https://doi.org/10.1117/12.821882

KEYWORDS: Picosecond phenomena, Fiber amplifiers, Semiconductor lasers, Fiber lasers, Amplifiers, Switches, Diodes, Optical amplifiers, Tunable filters, Optical filters

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SPIE Journal Paper | 1 October 2008

Laser distribution by optical fiber bundle in the ultrawideband antenna array

Chi Ruan, Wei Zhao, Baiyu Liu, Hongjun Liu

OE, Vol. 47, Issue 10, 104302, (October 2008) https://doi.org/10.1117/12.10.1117/1.3005370

KEYWORDS: Optical fibers, Laser energy, Fiber lasers, Antennas, Picosecond phenomena, Pulsed laser operation, Beam shaping, Cladding, Laser optics, Electromagnetism

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Proceedings Article | 10 June 2006 Paper

Ultra-broadband optical parametric chirped pulse amplification by the matching of both the group velocity and pulse front

Hongjun Liu, Wei Zhao, Yishan Wang, Hongying Wang, Xiaoli Li

Proceedings Volume 6344, 634408 (2006) https://doi.org/10.1117/12.693422

KEYWORDS: Dispersion, Transient nonlinear optics, Signal processing, Solids, Computer simulations, Wave propagation, Geometrical optics, Laser applications, Nonlinear crystals, Phase matching

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Proceedings Article | 26 August 1996 Paper

Texture synthesis using stochastic modeling

H. Liu, Zheng Tan, Wenbiao Zhang

Proceedings Volume 2785, (1996) https://doi.org/10.1117/12.248544

KEYWORDS: Motion models, Stochastic processes, Visual process modeling, Virtual reality, Computer graphics, Image processing, Fractal analysis, Wave propagation, Mathematical modeling, Lead

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Proceedings Article | 15 March 1994 Paper

Automatic interpretation of TV scene based on wavelet method

Loung Goung, H. Liu, Zheng Tan

Proceedings Volume 2242, (1994) https://doi.org/10.1117/12.170086

KEYWORDS: Wavelets, Edge detection, Image processing, Image fusion, Wavelet transforms, Image analysis, Ions, Image enhancement, Information fusion, Data processing

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Proceedings Article | 15 March 1994 Paper

Edge detection using adaptive scales wavelet transform

H. Liu, Loung Goung, Zheng Tan

Proceedings Volume 2242, (1994) https://doi.org/10.1117/12.170090

KEYWORDS: Wavelet transforms, Edge detection, Wavelets, Ions, Image processing, Detection and tracking algorithms, Image filtering, Algorithm development, Image analysis, Sensors

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Showing 5 of 14 publications

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