Conti Claudio
NooEL, Nonlinear and Optoelectronics Laboratory, National Institute for the Physics of Matter, INFM-Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 Jul;68(1 Pt 2):016606. doi: 10.1103/PhysRevE.68.016606. Epub 2003 Jul 14.
Plane waves in Kerr media spontaneously generate paraxial X-waves (i.e., nondispersive and nondiffractive pulsed beams) that get amplified along propagation. This effect can be considered to be a form of conical emission (i.e., spatiotemporal modulational instability), and can be used as a key for the interpretation of the out-of-axis energy emission in the splitting process of focused pulses in normally dispersive materials. A new class of spatiotemporal localized wave patterns is identified. X-wave instability and nonlinear X waves are predicted for both focusing and defocusing media and are expected in periodical Bose condensed gases.
克尔介质中的平面波会自发产生傍轴X波（即非色散且非衍射的脉冲光束），这些X波会在传播过程中得到放大。这种效应可被视为一种锥形发射形式（即时空调制不稳定性），并且可作为解释正常色散材料中聚焦脉冲分裂过程中的离轴能量发射的关键。一种新型的时空局域波模式被识别出来。预测了聚焦介质和散焦介质中的X波不稳定性及非线性X波，并且预计在周期性玻色凝聚气体中也会出现。
