Dark Spatial Solitary Wave Due to Cascaded x(2) Nonlinearity

The formation of the dark spatial solitary wave in cascaded second harmonic generation processes is numerically studied based on the nonlinear-coupled equations. It is shown that the solitary wave exists when the effective three-order nonlinearity induced by cascaded second-order nonlinearity is negative.     

波前扰动产生空间暗光孤子及孤子演化的实验研究

报道实验上观测到用波前扰动的空间光暗孤子的产生及演化规律，实验测量表明，首先，产生的空间暗孤子的空间轮廓是双曲正割型的函数，这与逆散射理论上的空间暗孤子解是一致的其次，观测了空间暗光孤子在自散焦介质中的演化过程，实验结果与非线性薛定谔方程计算机数值模拟的结果是一致的，结果表明，空间暗光子随着光束传输过程逐渐演化并在演化过程中逐渐形成了多个孤子对；最后，测量了不同细丝宽度，非线性系数与光强子空间暗孤     

有限高斯背景下空间暗光孤子自诱导波导的模式分析

从有限高斯背景下空间暗光孤子诱导折射率分布出发，用等效衰减矢量法得到它所自诱导的波导的色散特性，并与理想情况的无限背景下空间暗光孤子诱导的色散方程进行了比较。结果表明，当高斯背景越来越宽时，它与无限背景下的结果越来越接近，为在全光器件中实际应用提出了理论依据。     

基于热致非线性效应的暗空间光孤子实验研究

实验研究了热致非线性效应作用下，Ｃ＾６０甲苯溶液中强连续激光激发暗空间光孤子的过程，并给出了数值模拟结果。     

Dark Spatial Solitary Wave Due to Cascaded x^（2） Nonlinearity

The formation of the dark spatial solitary wave in cascaded second harmonic generation processes is numerically studied based on the nonlinear-coupled equations. It is shown that the solitary wave exists when the effective three-order nonlinearity induced by cascaded second-order nonlinearity is negative.     

Spatial Dark Solitons in an Atom Laser Beam

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｉｎｔｅｒｆｅｒｅｎｃｅｂｅｔｗｅｅｎｔｗｏＢｏｓｅＥｉｎｓｔｅｉｎｃｏｎｄｅｎｓａｔｅｓ［１］ｈａｖｅｇｒｅａｔｌｙｓｔｉｍｕｌａｔｅｄａｉｎｔｅｒｅｓｔｉｎｔｈｅｒｅａｌｉｚａｔｉｏｎｏｆａｎａｔｏｍｌａｓｅｒ［...     

Dark Soliton Transmission in Twin-Core Fiber

Dark soliton transmission is investigated by numerical simulation in twin-core fiber. It is shown that the energy exchange between two cores relates to initial relative phases and initial relative amplitudes of input dark solitons, it may be of regular and apparent period, irregular period, or non-period, and the influence factors on beat length are analysed.     

具有三体作用的玻色-爱因斯坦凝聚暗孤子的演化

运用变分法研究了具有三体作用的玻色-爱因斯坦凝聚暗孤子的演化特性,分析了调谐囚禁电势对暗孤子运动的影响.结果表明,囚禁在调谐势阱中的暗孤子将振动,势阱强度和三体作用的符号影响了暗孤子的演化,并改变了BEC系统的振动特性.     

All-optical Steerable Directional Coupler Using Kerr Dark Spatial Soliton Waveguides

1.IntroductionOpticalspatialsolitoninduced-waveguidesareofgreatresearchinterestrecently[1-8]becauseoftheirPOtentialapplicationinopticalcommunicationsandopticalcompution.Asoliton--inducedwaveguidecanguidelightinself--focusingorself--defocusingKerr-typemediabecausethesolitonbeaminducesarefractive-indexprofileequivalenttoanordinarydielectricwaveguide.Soliton-inducedwaveguidecansupPOrtmanymodesofaprobebeampropagatingcoaxiallyalongthesolitonwaveguideSoliton-inducedwaveguideshaveadvantageovertheir…     

双光子光折变介质中非相干耦合光伏孤子族

为了得到双光子非相干耦合光伏孤子族的结果,采用数值模拟方法,对稳态情况下多束互不相干的光束在双光子光伏光折变晶体中的传播进行了研究。结果表明:具有相同偏振和相同波长的多束互不相干的入射光束可在晶体中形成双光子非相干耦合光伏孤子族。当入射光束中仅包含两个分量时,孤子族就转化为光伏孤子对。并用双光子光伏光折变晶体Cu:KNSBN和LiNbO3进行了分析说明。研究结果可为空间光孤子理论的发展提供理论依据。     

弱光强空间屏蔽光伏明孤子的动态演化特性

在忽略晶体损耗和扩散效应的情况下，讨论了加外电场的光伏光折变晶体中弱光强空间屏蔽光伏明孤子及其演化特性，在弱光强条件下得到了空间屏蔽光伏明孤子的解析解表达式，与运用数值计算的方法所得到的结果十分吻合，该方法解决了以往数值求解动态演化方程时必须先数值求解常数分方程或积分方程的问题，讨论了参量失配情况下空间屏蔽光伏明孤子的动态演化特征。     

Generation of Fundamental Dark Soliton Train in Positive Dispersion-decreasing Fibers

ＧｅｎｅｒａｔｉｏｎｏｆＦｕｎｄａｍｅｎｔａｌＤａｒｋＳｏｌｉｔｏｎＴｒａｉｎｉｎＰｏｓｉｔｉｖｅＤｉｓｐｅｒｓｉｏｎｄｅｃｒｅａｓｉｎｇＦｉｂｅｒｓＸＵＷｅｎｃｈｅｎｇＷＥＮＳｈｕａｎｇｃｈｕｎ１）ＧＵＯＱｉＬＩＡＯＣｈａｎｇｊｕｎＬＩＵＳｏｎ...     

Generation of quadratic spatial dark soliton in periodically poled lithium niobate

In this paper, we report the evolution of quadratic spatial dark soliton in periodically poled lithium niobate (PPLN). The generation of solitons pairs by wavefront modulation methods is investigated in both numerical simulations and experiments. We found that quadratic dark spatial solitons have analogue performances compared with that in χ⁽³⁾ defocusing Kerr media.     

~ Transform Demonstration of Dark Soliton Solutions Found by Inverse Scattering

One of the basic problems about the inverse scattering transform for solving a completely integrable nonlinear evolutions equation is to demonstrate that the Jost solutions obtained from the inverse scattering equations of Cauchy integral satisfy the Lax equations. Such a basic problem still exists in the procedure of deriving the dark soliton solutions of the NLS equation in normal dispersion with non-vanishing boundary conditions through the inverse scattering transform. In this paper, a pair of Jost solutions with same analytic properties are composed to be a 2 × 2 matrix and then another pair are introduced to be its right inverse confirmed by the Liouville theorem. As they are both 2 × 2 matrices, the right inverse should be the left inverse too, based upon which it is not difficult to show that these Jost solutions satisfy both the first and second Lax equations. As a result of compatibility condition, the dark soliton solutions definitely satisfy the NLS equation in normal dispersion with non-vanishing boundary conditions.     

Explicit Soliton and Periodic Solutions to Three-Wave System with Quadratic and Cubic Nonlinearities

Lie group theoretical method and the equation of the Jacobi elliptic function are used to study the three wave system that couples two fundamental frequency (FF) and a single second harmonic (SH) one by competing χ⁽²⁾ (quadratic) andχ⁽³⁾ (cubic) nonlinearities and birefringence. This system shares some of the nice properties of soliton system. On the phase-locked condition, we obtain large families of analytical solutions as the soliton, kink and periodic solutions of this system.     

梯度折射率非局域介质中空间孤子振荡行为研究

应用等效粒子近似方法研究了光学空间孤子在带有局域和非局域非线性横向非均匀介质中的传输动力学行为.发现孤子在传播过程中横向的周期性振荡.折射率调制幅度和波导的归一化宽度决定了振荡周期的大小.介质的非局域对振荡振幅有着较小的影响.模拟了孤子传输过程,所得数值结果与理论分析符合很好.此外,模拟传输还发现多孤子束缚态能够在这个模型中稳定传播.这种振荡特性或许可以应用于光学路由器、转换器、开关等.     

Nonlinear All-Optical Switching Device by Using the Spatial Soliton Collision

We propose a new nonlinear all-optical switching device by using the spatial solitons collision. This is 1 × N switching device controlled by two control beams. The numerical results show that this device could really function as a 1 × N all-optical switching device. This device is a potential key component in the application of optical signal processing and optical computing systems.     

Nonlinear All-Optical Switching Device by Using the Spatial Soliton Collision

We propose a new nonlinear all-optical switching device by using the spatial solitons collision. This is 1 × N switching device controlled by two control beams. The numerical results show that this device could really function as a 1 × N all-optical switching device. This device is a potential key component in the application of optical signal processing and optical computing systems.     

叶绿素丙酮溶液中热致暗空间光孤子实验

设计了热致暗空间光孤子的实验光路和偶边界条件的实施方案，在叶绿素丙酮溶液中实现了热致暗空间光孤子实验，并采用分步傅里叶变换法进行了数值模拟，发现两者的结果一致。