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Summary: Noncollinear double quasi phase matching
in one-dimensional poled crystals
Tal Ellenbogen and Ady Arie
Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel
Solomon M. Saltiel
Faculty of Physics, University of Sofia, 5 J. Bourchier Boulevard, 1164 Sofia, Bulgaria
Received August 29, 2006; revised October 6, 2006; accepted October 20, 2006;
posted October 24, 2006 (Doc. ID 74428); published January 12, 2007
We demonstrate simultaneous phase matching of two different nonlinear processes, using a noncollinear
interaction in periodically poled crystal with single grating. The noncollinear scheme provides phase-
matching solutions over continuous regions of the optical spectrum and can be used for multiple-harmonic
generation as well as all-optical effects. We have demonstrated experimentally third-harmonic generation of
a 3 m pump wavelength in a noncollinear configuration using a periodically poled LiNbO3 crystal. We ob-
served, in good agreement with theoretical calculation, very broad spectral and thermal acceptance band-
widths, as well as a relatively narrow angular bandwidth. © 2007 Optical Society of America
OCIS codes: 190.2620, 190.4160, 190.4360.
Quasi phase matching (QPM) by periodic one-
dimensional (1D) modulation of the nonlinear coeffi-
cient makes it possible to phase match a single non-
linear interaction.1
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