论文标题
在线性介质中，脉冲光束之间快速碰撞的强烈影响，立方体损失弱
Strong effects of fast collisions between pulsed optical beams in a linear medium with weak cubic loss
论文作者
论文摘要
我们研究了脉冲光束之间的快速碰撞，在线性介质中，由于非排定两光子的吸收而引起的立方体损失弱。我们引入了一种带有两个小参数的扰动方法，并使用它来获取通用公式，以用于碰撞诱导的脉冲梁的形状和振幅变化。此外，我们使用该方法设计和表征碰撞设置，从而导致强大的局部和非定位强度降低效果。与先前对快速两脉冲碰撞的研究中获得的值相比，在两个设置中碰撞诱导的脉冲束形状变化的值都更大一到两个数量级。此外，我们表明，对于非定位的设置，碰撞诱导的振幅移位的图与两个脉冲梁的一阶分散系数之间的差异具有两个局部最小值。这一发现代表了该图与在存在弱非线性损失存在下的所有快速两脉冲碰撞研究中获得的图形偏离公共漏斗形状的偏差。尽管碰撞引起的效果很强，但我们的扰动理论的预测与具有扰动线性传播模型的数值模拟结果非常吻合。我们的结果可用于多级光学通信链接和重塑脉冲光束。
We investigate fast collisions between pulsed optical beams in a linear medium with weak cubic loss that arises due to nondegenerate two-photon absorption. We introduce a perturbation method with two small parameters and use it to obtain general formulas for the collision-induced changes in the pulsed-beam's shape and amplitude. Moreover, we use the method to design and characterize collision setups that lead to strong localized and nonlocalized intensity reduction effects. The values of the collision-induced changes in the pulsed-beam's shape in both setups are larger by one to two orders of magnitude compared with the values obtained in previous studies of fast two-pulse collisions. Furthermore, we show that for nonlocalized setups, the graph of the collision-induced amplitude shift vs the difference between the first-order dispersion coefficients for the two pulsed-beams has two local minima. This finding represents the first observation of a deviation of the graph from the common funnel shape that was obtained in all previous studies of fast two-pulse collisions in the presence of weak nonlinear loss. The predictions of our perturbation theory are in good agreement with results of numerical simulations with the perturbed linear propagation model, despite the strong collision-induced effects. Our results can be useful for multisequence optical communication links and for reshaping of pulsed optical beams.
