Open AccessUnified approach to Čerenkov second harmonic generation
Author(s) -
Vito Roppo,
Ksawery Kalinowski,
Yan Sheng,
Wiesław Królikowski,
C. Cojocaru,
J. Trull
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.025715
Subject(s) - physics , optics , second harmonic generation , nonlinear system , polarization (electrochemistry) , nonlinear optics , diffraction , high harmonic generation , cross polarized wave generation , cherenkov radiation , total internal reflection , quadratic equation , waveguide , bragg's law , self phase modulation , sum frequency generation , wave propagation , laser , quantum mechanics , detector , chemistry , geometry , mathematics
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.