Conti Claudio, Fratalocchi Andrea, Peccianti Marco, Ruocco Giancarlo, Trillo Stefano
Research Center SOFT INFM-CNR, Università di Roma La Sapienza, P. A. Moro 2, 00185 Roma, Italy.
Phys Rev Lett. 2009 Feb 27;102(8):083902. doi: 10.1103/PhysRevLett.102.083902. Epub 2009 Feb 26.
We investigate the propagation of a dark beam in a defocusing medium in the strong nonlinear regime. We observe for the first time a shock fan filled with noninteracting one-dimensional gray solitons that emanates from a gradient catastrophe developing around a null of the optical intensity. This scenario turns out to be very robust, persisting also when the material nonlocal response averages the nonlinearity over dimensions much larger than the emerging soliton filaments.
我们研究了强非线性区域中散焦介质中暗光束的传播。我们首次观察到一个充满非相互作用一维灰色孤子的激波扇，它源自光强零点附近发生的梯度灾难。结果表明，这种情况非常稳健，即使当材料的非局部响应在比出现的孤子细丝大得多的维度上平均非线性时，它也依然存在。
