摘要
由数字地用一个反复的预言者修正者解决 Maxwell-Bloch 方程有限差别的时间域技术，我们调查在 4,4 二度(di-n-butylamino ) 宣传很少周期激光脉搏的性质芪(BDBAS ) 分子的媒介当一个静态的电场存在时。动态二光子的吸收(TPA ) 十字节被获得并且光限制(OL ) 行为被显示。结果证明当静态的电场紧张增加时，动态 TPA 生气的节被提高， OL 行为被改进。而且，平顺序、奇怪顺序的泛音光谱因为它打破 BDBAS 分子的倒置对称，部件与静态的电场的存在被产生。这个工作提供一个方法调制 BDBAS 混合物的非线性的光性质。
By numerically solving the Maxwell-Bloch equations using an iterative predictor-corrector finite-difference time-domain technique, we investigate propagating properties of a few-cycle laser pulse in a 4,4＇-bis（di-n-butylamino） stilbene （BDBAS） molecular medium when a static electric field exists. Dynamical two-photon absorption （TPA） cross sections are obtained and optical limiting （OL） behavior is displayed. The results show that when the static electric field intensity increases, the dynamical TPA cross section is enhanced and the OL behavior is improved. Moreover, both even- and odd-order harmonic spectral components are generated with existence of the static electric field because it breaks the inversion symmetry of the BDBAS molecule. This work provides a method to modulate the nonlinear optical properties of the BDBAS compounds.
