Dong Rong, Rüter Christian E, Kip Detlef, Manela Ofer, Segev Mordechai, Yang Chengliang, Xu Jingjun
Institute of Physics and Physical Technologies, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany.
Phys Rev Lett. 2008 Oct 31;101(18):183903. doi: 10.1103/PhysRevLett.101.183903. Epub 2008 Oct 30.
We experimentally demonstrate the formation of spatial supercontinuum and of spatial frequency combs in nonlinear photonic lattices. This process results from multiple four-wave mixing initiated by launching two Floquet-Bloch modes into a one-dimensional lattice. The dynamics of the waves is sensitively dependent on the transverse momentum difference between the two initial modes: when this momentum difference is commensurable with the lattice momentum the waves evolve into a frequency comb, whereas when it is incommensurable the waves evolve into a supercontinuum of spatial frequencies.
