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Annular symmetry nonlinear frequency Dror Kasimov, Ady Arie, Emil Winebrand, Gil Rosenman

Summary: Annular symmetry nonlinear frequency
Dror Kasimov, Ady Arie, Emil Winebrand, Gil Rosenman
School of Electrical Engineering, Faculty of Engineering, Tel-Aviv University, Ramat Aviv, Tel-Aviv, Israel 69978
Ariel Bruner, Pnina Shaier and David Eger
Electro-Optics Division, Soreq NRC, Yavne 81800, Israel
Abstract: We present a new type of two-dimensional nonlinear structure
for quasi-phase matching. This structure has continuous rotational
symmetry, and in contrary to the commonly used periodic structures, is not
lattice shaped and has no translation symmetry. It is shown that this annular
symmetry structure possesses interesting phase matching attributes that are
significantly different than those of periodic structures. In particular, it
enables simultaneous phase-matched frequency doubling of the same pump
into several different directions. Moreover, it has extremely wide phase-
mismatch tolerance, since a change in the phase matching conditions does
not change the second harmonic power, but only changes its propagation
direction. Several structures were fabricated using either the indirect e-beam
method in LiNbO3 or the electric field poling method in stoichiometric
LiTaO3, and their conversion efficiencies, as well as angular and thermal
dependencies, were characterized by second harmonic generation.


Source: Arie, Ady - Department of Electrical Engineering-Physical Electronics, Tel Aviv University


Collections: Engineering