塌陷阈值以下空气中光的自发自沟道的观测
Observation of spontaneous self-channelling of light in air below the collapse threshold
摘要：
我们报告的120 fs，0.56毫焦耳的红外辐射在空气中的距离大于一米的自导传播的观察。与已知的双折射情况相反，在本实验中，激光功率低于塌陷阈值。因此，排除了克尔自聚焦和电离致散焦之间的平衡作为稳定机制。相反，我们发现的过程中，横向光束分布重塑成一种类似的汤斯孤子的形式的证据。我们包括数字支持这一结论。
英文摘要：
We report the observation of the self-guided propagation of 120 fs, 0.56 mJ infrared radiation in air for distances greater than one meter. In contrast to the known case of filamentation, in the present experiment the laser power is lower than the collapse threshold. Therefore the counter balance between Kerr self focussing and ionization induced defocussing as the stabilizing mechanism is ruled out. Instead, we find evidences of a process in which the transversal beam distribution reshapes into a form similar to a Townes soliton. We include numerical support for this conclusion.
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