波前扰动产生空间暗光孤子及孤子演化的实验研究

Experimental Study of Dark Spatial Soliton Generation and Evolution Using Method of Wavefront Perturbation

报道实验上观测到用波前扰动法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，空间暗光孤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、非线性系数与光强下空间暗孤子的产生及演化规律。改变实验参数，将改变空间暗孤子对数，以及同一阶空间暗孤子的横向速度，与逆散射理论预言一致。这些规律对于发展可驾驭（steerable）波导全光器件具有重要意义。

This paper reports the experiments of dark spatial soliton generation and evolution using method of wavefront perturbation. Generation of dark spatial solitons are confirmed- Evolution of dark spatial solitons are observed and are consistent with that of computer simulation. Changing experimental parameters, such as width of wires,nonlinear optical coefficient and laser intensity leads to the change of induced waveguides. These results will be valuable to all-optical steerable waveguide device.