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Breather for weak beam induced by strong beam in strongly nonlocal nonlinear medium
强非局域非线性介质中强光导引的弱光呼吸子传输规律研究

Lu Da-Quan,Hu Wei,
大全
,胡巍

物理学报 , 2013,
Abstract: Breather for weak beam induced by strong beam in a strongly nonlocal nonlinear medium is investigated. Although the nonlinearity induced by the weak beam is weak enough to be negligible, the nonlinearity induced by the strong beam can balance the diffraction of the weak beam, thus the breather for weak beam comes into being. The analytical solution of the breather for weak beam is obtained. Based on the analytical solution, the evolution of the beam width is analysed, and the form as well as the direction of helix for the trajectory of the breather is systematically investigated.
GH15和GH16合金的应用及工艺特点
大全
材料工程 , 1985,
Abstract: 本文简略地介绍了这两种材料应用的实际效果,分析了材料的工艺特点,阐述了试验和生产中出现的问题及解决措施。
苯并三唑衍生物的缓蚀作用及PPP量子化学研究
大全,
华东理工大学学报 , 1999,
Abstract: 通过挂片失重法和电化学极化曲线研究了苯并三唑,1-氯苯并三唑,5-硝基苯并三唑和5-氨基苯并三唑四种苯并三唑衍生物在NaCl溶液中对铜的缓蚀作用。用PPP-SCF半经验量子化学方法对它们的结构参数进行计算,分析表明BTA优良的缓蚀作用主要来自它对一价了了的促钝化作用,苯并三唑衍生物在铜表面的吸附是通过整个环上的π电子与铜相互作用实现的,π电子的化学吸附作用对其缓蚀性能有一定的影响。
HCl溶液中2—疏基苯并咪唑和1—苯基—5巯基—四氮唑对铜的缓蚀作用
大全,
华东理工大学学报 , 2002,
Abstract: 采用失重法、电化学极化曲线和电化学阻抗谱考察了0.5mol/LHCl溶液中2-巯基苯并咪唑(MBI)和1-苯基-5-疏基-四氮唑(PMTA)对铜的缓蚀作用。MBI和PMTA的加入使铜的自腐蚀电位正移,对铜电极的阳极腐蚀过程存在抑制作用,两者复配使用增强了对铜电极的阳极和阴极电化学过程的抑制作用,提高了铜电极膜电阻,从而具有较好的缓蚀协同效果。
The vectorial nonparaxial propagation method of the few-cycle ultrashort pulsed beam in free space
单周期以上超短脉冲光束在自由空间中的矢量非傍轴传输方法

Lu Da-Quan,Hu Wei,Yang Zhen-Jun,Zheng Yi-Zhou,
大全
,胡巍,杨振军,郑一周

物理学报 , 2004,
Abstract: Based on the purterbative method which was developed by Lax et al, and by using of the Fourier transform, we obtain a vectorial nonparaxial correction method to the propagation of the few-cycle pulsed beam in free space. the first-order of the transverse component of the correction is the same as that of Fu's in the frequency domain, and is more convenient to obtain the analytical nonparaxial solution in the temporal domain. It is shown in the examples and the analysis that the vector corrections must be included in any study that wants to go beyond the scalar paraxial solution. From the examples, we find that the spatial distribution of the vectorial nonparaxial correction would be influenced by the temporal distribution of the pulse.
Mutual-induced fractional Fourier transform in strongly nonlocal nonlinear medium
强非局域非线性介质中的互诱导分数傅里叶变换

Zhao Bao-Ping,Yang Zhen-Jun,Lu Da-Quan,Hu Wei,
赵宝平
,杨振军,大全,胡巍

物理学报 , 2011,
Abstract: The effect of mutual-induced fractional Fourier transform (FRFT) between a weak signal beam and a strong pump beam in a strongly nonlocal nonlinear medium is described. The signal beam is an FRFT during propagation and the order of FRFT is dependent on the propagation distance and the power of the pump beam. When the propagation distance is fixed, the order of FRFT of the signal beam is proportional to the square root of the power of the pump beam. Mutual-induced FRFT is another method of light controlling light, and its properties contribute to the development of new type FRFT devices, optical information processing and optical imaging.
Variational analysis of dipole soliton in nonlocal nonlinear Kerr media
非局域非线性克尔介质中两极孤子的变分解

Yang Zhen-Jun,Li Shao-Hua,Lu Da-Quan,Hu Wei,
杨振军
,李少华,大全,胡巍

物理学报 , 2010,
Abstract: By applying the variational method, we studied a kind of dipole soliton in the nonlocal nonlinear Kerr media. The parameter coupling equations of the dipole soliton were obtained, and numerical simulations were carried out. The results show that the transverse intensity distribution of the dipole soliton is similar to Hermite-Gaussian shape under the condition that the dipole soliton has a high energy which approaches the case of strongly nonlocal nonlinearity. There is a platform between the two intensity peaks of the dipole soltion under the condition that the dipole soliton has a low energy which belongs to the case of weakly nonlocal nonlinearity.
Numerical study of Hermite-Gaussian beams in nonlocal thermal media
厄米-高斯光束在热非局域介质中传输的数值模拟研究

Li Shao-Hua,Yang Zhen-Jun,Lu Da-Quan,Hu Wei,
李少华
,杨振军,大全,胡巍

物理学报 , 2011,
Abstract: 基于非线性薛定谔方程和热扩散的泊松方程,采用分步傅里叶算法以及多重网格法对厄米-高斯光束在不同形状的热非局域介质铅玻璃中的传输进行了数值模拟研究. 结果表明,低阶厄米-高斯光束可以较为稳定地在铅玻璃中传输. 高阶厄米-高斯光束在铅玻璃中传输变得不稳定,并且阶数越高,稳定性越差. 样品的形状对于厄米-高斯光束的影响很大. 在正方形样品中,厄米-高斯光束的传输与Snyder-Mitchell模型符合得相对较好. 在矩形样品中厄米-高斯光束在传输过程中的强度分布将发生较大的变化.
Propagation and spatiotemporal coupling of iso-diffraction ultra-short pulsed Hermite Gaussian beams in free space
等衍射超短脉冲厄米高斯光束在自由空间中的传输及其时空耦合效应

Lu Da-Quan,Hu Wei,Qian Lie-Jia,Fan Dian-Yuan,
大全
,胡巍,钱列加,范滇元

物理学报 , 2009,
Abstract: 从超短脉冲光束的傍轴传输方程出发,得出了描述任意脉冲形式驱动的等衍射超短脉冲厄米高斯光束在自由空间中的解析表达式. 并通过例子研究了超短脉冲厄米高斯光束的传输性质. 结果表明:在传输过程中,由于群速度的空间分布不均匀性,会导致超短脉冲光束的脉冲时间延迟,并进而导致了在脉冲不同位置处光束横向分布严重偏离了厄米高斯函数. 另外,在传输过程中,发现不同阶数的脉冲厄米高斯光束会发生不同次数的极化反转. 并用脉冲光束的群-相速度差对这一现象进行了解释.
The Analysis of the Non-paraxial Effects of the Ultrashort Pulsed Beam in Free Space
自由空间中超短脉冲光束的非傍轴效应分析

(Laboratory of Light Transmission Optics,South China Normal University,Guangzhou,
大全
,胡巍,郑一周,杨振军

光子学报 , 2005,
Abstract: Based on the spatial and temporal Fourier Transform, we developed a non paraxial correction method to the ultrashort few cycle pulsed beam, and it was illustrated with the family of pulsed Gaussian beam. The examples shows that, because of the exist of the spatiotemporal coupling, the temporal distribution of the pulse would influence the spatial distribution of the non paraxial correction.
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