A5116039431- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Advanced Antenna and Metasurface Technologies
- Advanced Optical Sensing Technologies
- Plasmonic and Surface Plasmon Research
- Optical Polarization and Ellipsometry
- Spectroscopy and Laser Applications
- Geophysical Methods and Applications
- Geomechanics and Mining Engineering
- Orbital Angular Momentum in Optics
- Electromagnetic Scattering and Analysis
- Surface Roughness and Optical Measurements
- Optical measurement and interference techniques
- Photonic Crystal and Fiber Optics
- Geoscience and Mining Technology
- Optical and Acousto-Optic Technologies
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Metamaterials and Metasurfaces Applications
- Optical Wireless Communication Technologies
Fujian Normal University
2007-2011
We undertake a computational and experimental study of an advanced class structured beams, partially coherent radially polarized vortex (PCRPV) on propagation through atmospheric turbulence. A model is established to simulate this it used calculate the average intensity on-axis scintillation index PCRPV beams. On comparison with other classes such as beams found that which structure phase, coherence polarization simultaneously, show marked improvements in propagation. The simulation results...
Abstract A four‐channel fiber loop ring‐down pressure sensor with temperature compensation based on neural networks is described.This makes use of the principle time division multiplexing, which consists series and parallel loops. The laser pulses from four‐channels can be acquired by only one detector four values are measured synchronously in our experiment. Taking mode dispersion multimode into consideration, maximum multiplexing number discussed. In addition, has been successfully used...
The investigation of how to control themicrowave scattering from strong sources has vital applications in military and civilian areas. As a typical target, right-angle dihedral corner reflector been extensively investigated because its electromagnetic over wide observation angle range. In this letter, with three loading conditions the camouflage grass described our previous is discussed investigate radar cross-section (RCS) reduction effect for target. For different RCS effects conditions,...
In this work, the complex electromagnetic model of a camouflage grass was accurately generated in geometry, which leaves were represented by lathy curved rectangular metal surfaces. To investigate scattering characteristics radar band, its cross section (RCS) from 4 GHz to 18 calculated multilevel fast multipole method (MLFMM). For validation, sample manufactured and measured. A relatively good agreement observed between results calculation measurement. Based on modeling method, with...
The relationship between the speckle contrast of scattered light in near field and longitudinal distance that is perpendicular to scattering surface investigated. experiment indicates when using laser illumination source with proper time coherence length, curve vs. appears minimum turning point. position value point are decided by matter. It easy obtain correlation area measuring illuminated area. Comparing traditional technique, this method can simultaneously measure roughness parameters...
Fiber Bragg grating (FBG) accelerometers are extensively utilized across various industries. For a high-performance FBG accelerometer interrogator, achieving low cost, wide range, multi-channel capability, high precision, and high-speed demodulation is critical. This paper proposes chip-level wavelength method for utilizing cascaded micro-ring resonator (MRR) array. Capable of demodulating multiple within 27.8 nm bandwidth at speed up to 1.6 kHz, the system’s performance evaluated in terms...
Based on an approximate model for acoustic waves in a silica rod with circular cross section, we theoretically investigated the dispersion properties of hybrid acoustical modes and acousto-optical interactions small core photonic crystal fiber. The calculation result shows that dual-peaked Brillouin scattering gain coefficient spectrum is caused by mode coupling fiber core. Together modes, influence pump wavelength temperature are also calculated via their influences wave vector material...
The principle of optical eigenfunction is used in the analysis speckle reduction laser projection display.When moving diffuser approach, contrast decided by both degree freedom (DOF) projector and area resolving cell eyes on screen.It can gain high DOF increasing space-bandwidth product, i.e., adopting a lens with numerical aperture or large viewing field.The best scheme equalizing scattering wave from to that lens.The experimental results are accordance conclusion drawn eigenfunction.
In this paper, a universal description of the optical coherence is represented, where quasi-monochromatic field and corresponding are expressed by Dirac state vector operator, respectively. The spatial coherence, temporal partial polarization described abstract operator i. e. operator. With method, becomes simple flexible, reveals essence coherence.