Polesana P, Couairon A, Faccio D, Parola A, Porras M A, Dubietis A, Piskarskas A, Di Trapani P
Department of Quantum Electronics, Vilnius University, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania.
Phys Rev Lett. 2007 Nov 30;99(22):223902. doi: 10.1103/PhysRevLett.99.223902. Epub 2007 Nov 27.
Excitation of unbalanced-Bessel beams by a gradual increase of nonlinearity in a water sample outlines the achievement of the first ever observed quasimonochromatic wave packet that propagates stably for hundreds of Rayleigh lengths in a focusing and dispersive Kerr medium, i.e., in the absence of spectral broadening and conical emission. A modulational instability analysis reveals the key role of nonlinear dissipation in quenching the growth of spatiotemporal unstable modes.
通过逐渐增加水样中的非线性来激发非平衡贝塞尔光束，这勾勒出了首次观测到的准单色波包的成果，该波包在聚焦和色散克尔介质中能稳定传播数百个瑞利长度，即不存在光谱展宽和锥形发射的情况。调制不稳定性分析揭示了非线性耗散在抑制时空不稳定模式增长中的关键作用。
