Ms. Jie Huang Profile

Jie Huang

at Hunan Univ of Science and Technology

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Proceedings Article | 29 November 2012 Paper

Nonlinear imaging properties of two parallel gain-typed wirelike scatterers

Jie Huang, Yonghua Hu

Proceedings Volume 8551, 855106 (2012) https://doi.org/10.1117/12.999940

KEYWORDS: Beam propagation method, Free space, Nonlinear optics, Computer simulations, Modulation, Image processing, Imaging systems, Image acquisition, Gaussian beams, Optical components

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Based on the optical path model for nonlinear imaging, we systematically investigated the propagation of flat-topped Gaussian beam which is modulated by two parallel gain-typed wirelike scatterers through computer simulation. It is found that hot image for each scatterer can be formed, with the hot image plane several centimeters behind the predicted conjugated plane obtained by the approximate theory for attenuation-typed scatterers. It is found that the object distance, i.e. the distance from the scatterer plane to the incident surface of the Kerr medium slab, has an important influence on the propagation properties and results in a new phenomenon. Under certain object distances, the evolution of the maximum intensity of the beam has one prominent peak before that for hot image, where the on-axis location is dozens of centimeters ahead of the hot image plane. As the size of the scatterers increases, the value of this peak increases at first and then decreases. As the object distance increases, the value of this peak decreases. The intensity distribution corresponding to this peak shows that, there is an intense fringe, which is the most intense fringe in the plane, at the middle point of the line connecting the two scatterers, indicating that it is a unique result of the interaction of the two scatterers. Besides, the influences of the object distance and the scatterer size on hot image intensity are discussed.

Proceedings Article | 17 November 2010 Paper

Nonlinear images of gain defects

Yonghua Hu, Haibo Wu, Qiuyun Zheng, Jie Huang, Jianbo Xu

Proceedings Volume 7843, 78431G (2010) https://doi.org/10.1117/12.870074

KEYWORDS: Signal attenuation, Phase modulation, Modulation, Nonlinear optics, Image processing, Beam propagation method, High power lasers, Image fusion, Free space, Image enhancement

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The nonlinear imaging effect for small-scale defects with gain defect, which may be caused by the uneven gain in gain media, is investigated through numerically solving the propagation model with the standard split-step fast-Fouriertransform algorithm. Two cases, i.e. defects only causing gain and defects causing both gain and phase modulation, are considered. It is proved that nonlinear images can also be formed. However, when compared to the nonlinear imaging effect for defects causing attenuation, it is found that: firstly, the intensity at the point corresponding to the center of the scatterer experiences an obvious decreasing just before the nonlinear image is formed, contrary to the case the defect causing attenuation; secondly, this decreasing is enhanced as the gain caused by the defect increases; thirdly, there is a distance several centimeters, even more than ten centimeters, between the nonlinear images for gain defects and those for attenuation defects. For defects which cause both gain and phase modulation, above differences are ignorable, but the nonlinear imaging effect has some new properties: firstly, the beam peak intensity on the exit surface of the nonlinear medium is higher than that in the case the defect only causing phase modulation; secondly, the second-order nonlinear image is increased obviously, but the effect of the defect's gain on the image's peak intensity is limited. Besides, the effect of the distance between the defect and the nonlinear medium and that of the power of incident beam are discussed.

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