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国家自然科学基金(10174025)

作品数:17 被引量:47H指数:4
相关作者:刘劲松张光勇刘时雄王程张绘蓝更多>>
相关机构:华中科技大学西安电子科技大学武汉理工大学更多>>
发文基金:国家自然科学基金教育部科学技术研究重点项目教育部“优秀青年教师资助计划”更多>>
相关领域:理学机械工程电子电信更多>>

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17 条 记 录,以下是 1-10
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无偏压的串联光折变晶体回路中高斯光束传播特性调节被引量:8
2002年
根据串联光折变晶体回路中独立空间孤子对理论 ,研究了明暗孤子对之间的相互依赖特性 .假设一束暗孤子波和一束高斯光束分别入射到回路中两块晶体上 ,利用数值计算方法讨论了改变其中暗孤子光束的强度对高斯光束在另外一个晶体中传播特性的影响 .结果表明 ,调节暗孤子的强度能够影响高斯光束的传播特性 。
郝中华刘劲松
关键词:串联光折变晶体回路非线性光学光折变效应高斯光束
基于运动光栅光折变双光束耦合的刚性全息明孤子的动态演化被引量:6
2005年
研究基于运动光栅双光束耦合的耗散光折变系统中的空间光孤子的动态演化问题.数值计算表明,系统参数同这种孤子的稳定性密切相关.在某组系统参数下,孤子可以在晶体内稳定传播足够远的距离.双光束耦合的相位与强度耦合系数之比越大,孤子的稳定性越好.讨论了将这种系统应用于光学开关、中继及分路器件的可能性.
刘劲松杜泽明
关键词:空间光孤子耗散系统全息光栅
Quasistable bright dissipative holographic solitons in photorefractive two-wave mixing system被引量:1
2007年
The dynamical evolution of both signal and pump beams are traced by numerically solving the coupled-wave equation for a photorefractive two-wave mixing system. The direct simulations show that, when the intensity ratio of the pump beam to the signal beam is large enough, the pump beam presents a common decaying behaviour without modulational instability (MI), while the signal beam can evolve into a quasistable spatial soliton within a regime in which the pump beam is depleted slightly. The larger the ratio is, the longer the regime is. Such quasistable solitons can overcome the initial perturbations and numerical noises in the course of propagation, perform several cycles of slow oscillation in intensity and width, and persist over tens of diffraction lengths. From physical viewpoints, these solitons actually exist as completely rigorous physical objects. If the ratio is quite small, the pump beam is apt to show MI, during which the signal beam experiences strong expansion and shrinking in width and a drastic oscillation in intensity, or completely breaks up. The simulations using actual experimental parameters demonstrate that the observation of an effectively stable soliton is quite possible in the proposed system.
刘劲松
圆柱瑞利波的时频特征
圆柱表面瑞利波具有许多潜在的应用,而激光超声方法是研究弯曲表面波的有效手段。上世纪80年代末以来,Royer等[1]首先采用激光超声方法对金属球表面瑞利波开展了一系列的研究工作。采用脉冲激光在球表面激励,用激光干涉仪检测...
胡文祥钱梦騄
关键词:瑞利波激光干涉仪
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温度对闭路光伏明空间孤子演化和自偏转的影响(英文)被引量:6
2007年
通过考虑扩散效应的影响,采用数值方法研究了温度对光伏光折变介质中的明空间孤子演化和自偏转的影响。结果表明,当晶体温度变化时,明孤子可以呈现为稳定态、较大周期的压缩和膨胀态,或塌陷态。同时,明空间孤子中心偏转距离随温度增加而增加,在一个特定温度处达到最大值,之后随温度增加而减小,在高温和低温区域此偏转距离趋于零。孤子的最大偏转距离和对应的特定温度随入射孤子波强度的增加而增加。进一步采用微扰方法研究了明孤子自偏转过程,其结果与数值方法获得的结果一致。
张光勇刘劲松刘时雄
关键词:空间光孤子光折变效应光伏效应自偏转
Diffusion-induced deflection and the effect of two-wave mixing gain on dissipative photovoltaic solitons被引量:2
2007年
In an open-circuit dissipative photovoltaic (PV) crystal, by considering the diffusion effect, the deflection of bright dissipative photovoltaic (DPV) solitons has been investigated by employing numerical technique and perturbational procedure. The relevant results show that the centre of the optical beam moves along a parabolic trajectory, while the central spatial-frequency component shifts linearly with the propagation distance; furthermore, both the spatial deflection and the angular derivation are associated with the photovoltaic field. Such DPV solitons have a fixed deflection degree completely determined by the parameters of the dissipative system. The small bending cannot affect the formation of the DPV soliton via two-wave mixing.
刘时雄刘劲松张绘蓝张光勇王程
关键词:DEFLECTION
屏蔽光伏孤子诱导的非线性光波导(英文)
2006年
从理论上研究了由一维稳态屏蔽光伏孤子诱导的非线性波导,结果表明在加偏压的光伏光折变晶体中,例如铌酸锂,无论是明孤子还是暗孤子都能诱导出非线性波导。推导出了在一般条件和低振幅条件下探测光束满足的波方程。
许德胜刘劲松
关键词:空间光孤子非线性波导光折变效应
圆柱瑞利波的激光激发和检测
材料的强度,使用寿命等都与材料表面的力学特性密切有关。因此,表面波技术成为重要的无损检测手段。由于激光超声免除了压电检测技术的耦合问题,使研究表面波在弯曲表面的传播特性取得进展[1,2]。本文将对圆柱表面的波及其在表面应...
钱梦騄刘巍
关键词:激光激发瑞利波
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光折变空间光孤子的顶侧面观测法被引量:3
2007年
基于CCD图像采集技术与计算机软件处理技术,提出了空间光孤子的顶侧面观测法.此方法能够非常直观地显示出光孤子在晶体内部传输时,在水平及垂直方向上不同位置的轮廓图.用这种方法观测到了KNSBN晶体中的二维光伏明孤子,观测结果与理论模拟结果相一致.
王程刘劲松张光勇刘时雄张绘蓝
关键词:空间光孤子光伏效应
Temperature effect on dissipative holographic screening-photovoltaic solitons in a biased dissipative system
2008年
In a biased dissipative photovoltaic-photorefractive system, this paper investigates the temperature effect on the evolution and the self-deflection of the dissipative holographic screening-photovoltaic (DHSP) solitons. The results reveal that, the evolution and the self-deflection of the bright and dark DHSP solitons are influenced by the system temperature. At a given temperature, for a stable DHSP soliton originally formed in the dissipative system, it attempts to evolve into another DHSP soliton when the temperature change is appropriately small, whereas it will become unstable or break down if the temperature departure is large enough. Moreover, the self-deflection degree of the solitary beam centre increases as temperature rises in some range, while it is decided by the system parameters and is slight under small-signal condition. The system temperature can be adjusted to change the formation and the self-deflection of the solitary beam in order to gain certain optical ends. In a word, the system temperature plays a role for the DHSP solitons in the dissipative system.
刘时雄刘劲松蔡欣樊婷张光勇
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