Abstract
We study a scattering-assisted second harmonic generation process of a structured fundamental wave, whose phase front is periodically modulated, in a homogenous nonlinear medium. Scattering-assisted multiple-conical second harmonic in a one-dimensional structured fundamental wave and second harmonic belts in two-dimensional cases were observed. The experimental results are consistent with our analysis. This method not only allows dynamic control of the scattering-assisted second harmonic signal, but also has potential applications in various nonlinear frequency conversion processes.
Highlights
Scattering phenomenon has been extensively investigated in nature
Not limited in linear optics, such scattering phenomenon has been reported in processes of nonlinear frequency conversion [1,2,3,4,5,6], in which the nonlinear signal is enhanced because of the phase matching of the incident and scattered light in some special directions
The quasi-phase matching(QPM) method allows to phase match a nonlinear process in the transparency range of the nonlinear photonic crystals (NPCs) by spatially modulating its nonlinear coefficient
Summary
Scattering phenomenon has been extensively investigated in nature. In general, scattering of light could be a detrimental effect in some fields, such as optical communication and imaging system, but it could be beneficial in others. Since QPM proposed by Bloembergen et al in 1962 [7], plenty of phase-matching geometries by diverse types of one- and two-dimensional NPCs, including square, hexagonal lattices, annular periodical, or even random structures [8,9,10,11,12] have been studied Such special designed NPCs provide a method to enhance the conversion efficiency of the nonlinear signal, and provide a platform to shape the light beam in nonlinear manner [13,14,15,16,17,18,19]. When transverse phase periodical modulated FW propagates along a homogenous second order nonlinear medium, scattering-assisted multiple-conical SH can be observed This method provides a way to manipulate the scattering-assisted SH signal in real time and has potential applications in various nonlinear frequency conversion processes
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