Unified approach to Čerenkov second harmonic generation.
We discuss the effect of second harmonic generation via the Čerenkov-like process in nonlinear bulk media and waveguides. We show that in both schemes the Čerenkov harmonic emission represents in fact a nonlinear Bragg diffraction process. It is therefore possible, for the first time, to describe the bulk and waveguide Čerenkov emission uniformly by considering the spatial modulation of the second-order nonlinear polarization. This is also experimentally illustrated by studying the Čerenkov second harmonic generation at the boundary of a nonlinear quadratic medium via the total internal reflection inside the nonlinear crystal.
Vito
V
Roppo
Ksawery
K
Kalinowski
Yan
Y
Sheng
Wieslaw
W
Krolikowski
Crina
C
Cojocaru
Jose
J
Trull