Dr. Lei Zhang Profile

Dr. Lei Zhang

at Changchun Univ of Science and Technology

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Author

Publications (13)

Proceedings Article | 13 December 2021 Paper

Modulation of polarized vector field by lithography system

Wentao Jia, Wenjun He, Linghao Wu, Lei Zhang

Proceedings Volume 12073, 120730B (2021) https://doi.org/10.1117/12.2604865

KEYWORDS: Polarization, Modulation, Lithography, Imaging systems, Ray tracing, Geometrical optics, Atmospheric optics, Lithographic illumination, Phase shift keying, Light sources

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SPIE Journal Paper | 10 March 2020

Design and evaluation of a high-sensitivity digital receiver with the finite impulse response filter algorithm for free-space laser communication

Xiaonan Yu, Xingchi Chen, Yansong Song, Lei Zhang, Jun Jiang, Tong Wang, Shoufeng Tong

OE, Vol. 59, Issue 03, 036105, (March 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.3.036105

KEYWORDS: Receivers, Digital filtering, Avalanche photodetectors, Signal to noise ratio, Finite impulse response filters, Optical filters, Data communications, Laser communications, Sensors, Satellites

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Proceedings Article | 31 August 2018 Paper

The development of counter-unmanned aerial vehicle technologies

Wenqi Zhang, Lei Zhang, Baichun Yang, Hairui Gu, Dawei Wang, Kai Yang

Proceedings Volume 10835, 108351O (2018) https://doi.org/10.1117/12.2505628

KEYWORDS: Unmanned aerial vehicles, Weapons, Radar, Defense systems, Missiles, Surveillance, Control systems, Target detection, Defense and security, Warfare

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Proceedings Article | 20 February 2018 Paper

Method for detecting coherence of multiple optical axes

Lei Zhang, Xuan Zhao

Proceedings Volume 10697, 106970K (2018) https://doi.org/10.1117/12.2309326

KEYWORDS: Reticles, Mirrors, Infrared radiation, Infrared cameras, Infrared detectors, Infrared imaging, Imaging systems, Coherence (optics), Mathematical modeling, Thermography

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Proceedings Article | 12 January 2018 Paper

Multi-axis parallelism measuring system with temperature insensitivity

Lei Zhang, Kai Zhang

Proceedings Volume 10621, 106210W (2018) https://doi.org/10.1117/12.2288058

KEYWORDS: Mirrors, Collimators, Glasses, Zinc, Temperature metrology, Infrared radiation, Optical scanning systems, Reticles, Carbon, Visible radiation

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SPIE Journal Paper | 17 October 2017

Modeling and reality analysis of beaconless spatial acquisition for intersatellite laser communication system

Min Zhang, Shoufeng Tong, Yansong Song, Lei Zhang, Yunjie Teng

OE, Vol. 56, Issue 10, 106108, (October 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.10.106108

KEYWORDS: Telecommunications, Laser communications, Signal detection, Laser systems engineering, Satellites, Signal processing, Optical communications, Process modeling, Visualization, Optical simulations

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Proceedings Article | 7 November 2016 Paper

Measuring the thermal expansion coefficient of the carbon fiber optical tube by heterodyne laser interferometry

Kai Zhang, Wenjun He, Lei Zhang, Xuan Zhao, Yuqi Tian

Proceedings Volume 10141, 101411I (2016) https://doi.org/10.1117/12.2256226

KEYWORDS: Carbon, Heterodyning, Laser interferometry, Fiber optics tests, Fiber optics, Optical design, Temperature metrology, Mirrors, Structured optical fibers, Aluminum

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Proceedings Article | 5 November 2015 Paper

Research on the shape error from the Gaussian moth-eye antireflection microstructure elements made by the laser interference lithography technology

Tingting Dong, Yuegang Fu, Lei Zhang, Chi Chen

Proceedings Volume 9795, 97952X (2015) https://doi.org/10.1117/12.2208870

KEYWORDS: Reflectivity, Antireflective coatings, Laser applications, Lithography, Silicon, Mid-IR, MATLAB, Manufacturing, Nanotechnology, Optoelectronics

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Proceedings Article | 13 April 2015 Paper

On simulation and verification of the atmospheric turbulent phase screen with Zernike polynomials

Liming Dai, Shoufeng Tong, Lei Zhang, Yinhuan Wang

Proceedings Volume 9522, 95221O (2015) https://doi.org/10.1117/12.2180218

KEYWORDS: Atmospheric turbulence, Zernike polynomials, Turbulence, Spatial frequencies, Laser communications, Refractive index, Wavefronts, Atmospheric optics, Atmospheric sciences, Defense technologies

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Atmospheric turbulence is one of the main factors that influence the spread of laser communication in the atmosphere affect, which will change the random distribution of the refractive index of air, and affect the image quality of the beam through the atmosphere seriously. To study atmospheric turbulence in order to grasp changes in atmospheric turbulence, by taking the appropriate methods to control and reduce the effects of atmospheric turbulence on the beam quality. In addition to studying atmospheric turbulence using experimental methods and theoretical analysis. Numerical simulation is an effective means to study the problem of turbulence. Zernike polynomials were used to produce atmospheric turbulence phase screen in this article. The phase structure function and the atmospheric coherence length were used to check whether the atmospheric turbulence phase screen is right or not. Simulation results were studied show that, the atmospheric turbulence phase screen generated with Zernike polynomial method was consistent with the theoretical values in the low spatial frequency components, but, the simulation results had big difference with the theoretical values in the high spatial frequency components. The reason is that Zernike polynomials method has some limitations. In addition, the distribution of turbulence in the atmospheric turbulence phase screen can be changed by increasing the Zernike polynomials of orders or changing the receiving apertures, but which involves great and complex calculation. Therefore, in the specific application of the laser communication system, the best experimental program should be considered. Statistical properties of atmospheric turbulence phase can be described by the phase structure function. Therefore, the structure of the function will be used to determine the phase screen simulation phase screen is accurate. To give a better understanding of both methods the difference between simulation results, the simulation results of Zernike polynomials and power spectral inversion simulation results were compared. At last to give the corresponding power spectrum inversion method to simulate atmospheric turbulence phase screen simulation results and shows that the theory without making the introduction.

Proceedings Article | 31 December 2013 Paper

Research on the liquid crystal adaptive optics system for human retinal imaging

Lei Zhang, Shoufeng Tong, Yansong Song, Xin Zhao

Proceedings Volume 9042, 904213 (2013) https://doi.org/10.1117/12.2037069

KEYWORDS: Liquid crystals, Eye, Wavefronts, Adaptive optics, Molecules, Wavefront sensors, Imaging systems, Refractive index, Microlens array, Phase modulation

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Proceedings Article | 21 August 2013 Paper

Based on ground station adaptive optics for laser communications demonstration platform structures

Lei Zhang, Shoufeng Tong, Haozeng Wang, Hongkun Yang

Proceedings Volume 8906, 89061N (2013) https://doi.org/10.1117/12.2034234

KEYWORDS: Adaptive optics, Laser communications, Atmospheric turbulence, Telecommunications, Liquid crystals, Zernike polynomials, Optical communications, Control systems, Atmospheric optics, Laser systems engineering

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With the rapid development of modern science and technology in astronomical imaging, optical communications, optical radar, optical information processing, high-precision ranging, tracking, guidance, and remote sensing, light waves propagating in the medium, especially in the turbulent atmosphere spread more and more important. Atmospheric turbulence is one of the main factors which have influence on the performance of a laser communication system. Adaptive optics technology is an important means to solve the problem of atmospheric turbulence. This paper states how adaptive optics technique can be used in space laser communication system to compensate atmospheric turbulence when laser beam transmission through it. The core content of adaptive optics is correct laser beam wave-front disturbance in real-time，with it to enhance optical system imaging quality and the next aim is reach the level of diffraction limitation. Adaptive optics system consists of wave-front detection， wave-front control and wave-front correction . The demo platform including: atmospheric turbulence simulation unit、adaptive correction unit、signal transmitting and receiving unit. Liquid crystal spatial light modulator applications in adaptive optics system and the turbulence simulation system introduced. And used zernike polynomials method to produce atmospheric turbulence phase screen simulation analysis. Simulation results show that: in the low spatial frequency components, the atmospheric turbulence phase screen generated by Zernike polynomial method consistent with the theoretical values, but in the high spatial frequency components, the simulation results with large difference between the theoretical values. In addition, the simulation results also show that: we can change the distribution of turbulence in the atmospheric turbulence phase screen by increasing the Zernike polynomials of orders or change the receiving apertures, but to calculate the large calculate the complex and other shortcomings. If adaptive optics technique can be applied in space laser communication system and is proved by practice， must make a space laser communication system performance has greatly improved.

Proceedings Article | 21 August 2013 Paper

The research of high-speed clock in space laser communication

Hong-kun Yang, Shou-feng Tong, Lei Zhang, Hao-zeng Wang

Proceedings Volume 8906, 89061P (2013) https://doi.org/10.1117/12.2034296

KEYWORDS: Clocks, Laser communications, Signal processing, Power supplies, Reliability, Telecommunications, Oscillators, Voltage controlled current source, Aerospace engineering, Imaging systems

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Proceedings Article | 21 August 2013 Paper

The research of high efficient optical fiber coupling technology in space laser communication

Hao-zeng Wang, Shou-feng Tong, Lei Zhang, Hong-kun Yang

Proceedings Volume 8906, 89061L (2013) https://doi.org/10.1117/12.2034085

KEYWORDS: Single mode fibers, Fiber couplers, Aerospace engineering, Free space optical communications, Fiber optic communications, Atmospheric turbulence, Turbulence, Electromagnetism, Statistical analysis, Refractive index

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With the development of optical fiber communications, especially the maturity of the optical amplifiers and the WDM technology, space optical communication at 1550 nm becomes a promising solution for future high speed satellite communication. Receiving technology with optical amplifiers and coupling space light into single mode fiber are key technologies in space optical communication at 1550 nm. Free-space-to-fiber coupling technique investigated in this paper is the first challenge of applying fiber communication techniques to free space optical communications. We analyzed the factors that affect the efficiency of free-space-to single-mode-fiber coupling based on mode-matching theory of electromagnetic fields. On this objective, in this paper, the theoretical analysis of the effect of atmospheric turbulence on the space light-single mode fiber coupling efficiency is discussed. On this basis, the short-distance experiment coupling space light into single mode fiber is carried out. 1. The main factors affecting the process coupling space light into single mode fiber are analyzed. This paper introduced the statistical theory of atmospheric turbulence and gave out the main turbulence parameters and meteyard based on the theory of the space light-single mode fiber coupling efficiency under ideal conditions. 2. The influence of atmospheric turbulence on the space light-single mode fiber coupling efficiency is analyzed and simulated. In the weak turbulence condition, mathematical model of the mean coupling efficiency and its fluctuation variance was given. And the fluctuation variance of coupling efficiency was simulated studied under the atmospheric conditions. The influences on the average coupling efficiency was theoretically studied, which were induced by the structure constant of atmospheric refractive index, the diameter of coupling lens and the single-mode fiber mode field radius. 3. Validating the theoretical model by a experiment under a short link coupling condition. The results of this paper lay the theoretical and experimental foundation for indeed establishing the efficient space light-single mode fiber coupling systems.

Showing 5 of 13 publications

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