Nonlinear diffraction from a virtual beam.
We observe experimentally a novel type of nonlinear diffraction in the process of two-wave mixing on a nonlinear quadratic grating. We demonstrate that when the nonlinear grating is illuminated simultaneously by two noncollinear beams, a second-harmonic diffraction pattern is generated by a virtual beam propagating along the bisector of the two pump beams. The observed diffraction phenomena is a purely nonlinear effect that has no analogue in linear diffraction.
Saltiel
Solomon M
SM
Nonlinear Physics Center and Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
Neshev
Dragomir N
DN
Krolikowski
Wieslaw
W
Voloch-Bloch
Noa
N
Arie
Ady
A
Bang
Ole
O
Kivshar
Yuri S
YS