论文部分内容阅读
在自散焦介质中,平面波的传播对小的调制扰动是绝对稳定的,暗空间孤子正是作为平面波背景上的一种局域暗迹而存在的。基于这种调制稳定性,给出了由光生伏打自散焦非线性支持的一维灰空间孤子的演化方程,并在光生伏打光折变LiNbO3∶Fe晶体中给出了它的静态解。数值研究了这种灰空间孤子的诸多性质:例如在不同的孤子灰度下的孤子轮廓和它的相位分布;光生伏打灰孤子的归一化横向传播速度和归一化半峰全宽随归一化的背景光强和孤子灰度的变化等,所有这些性质都可以通过调节孤子波两侧的相位差加以控制,并详细地比较了光生伏打灰孤子和屏蔽灰孤子之间的异同。
In self-defocusing medium, the propagation of plane wave is absolutely stable to small modulation perturbations, and dark space soliton exists as a kind of local dark trace on the plane wave background. Based on this modulation stability, the evolution equation of one-dimensional gray space solitons supported by photovoltaic self-defocusing nonlinearity is given and its static solution is given in the photoluminescence photorefractive LiNbO3:Fe crystal . The properties of this gray space soliton are studied numerically: for example, the soliton contour and its phase distribution under different soliton grayscale; the normalized transverse propagation velocity and the normalized full width at half maximum of the soliton Normalized background intensity and gray level of soliton, all of these properties can be controlled by adjusting the phase difference between two sides of the soliton wave, and the similarities and differences between the soliton and gray soliton are compared in detail .