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Applications of non-collinear second harmonic generation in one-dimensional periodically poled crystals

Summary: Applications of non-collinear second harmonic generation
in one-dimensional periodically poled crystals
Tal Ellenbogen, Ady Arie *
Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel
Received 25 March 2007; received in revised form 9 May 2007; accepted 11 May 2007
Whereas the commonly used collinear quasi-phase-matched interaction is usually suitable for phase matching only a single nonlinear
process, non-collinear interactions offer rich variety of phase matching possibilities, employing different elements of the nonlinear tensor,
and various orders of quasi phase matching. By studying the dependence of the second harmonic process on the angle and the phase
matching order in a periodically poled LiNbO3 crystal, we can non-destructively derive the duty cycle of the structure. The obtained duty
cycle agrees well with surface scan measurements using an atomic force microscope. Furthermore, by proper selection of the non-col-
linear angle, we demonstrate simultaneous second harmonic generation of two cross polarized waves.
2007 Elsevier B.V. All rights reserved.
Keywords: Frequency conversion; Multiharmonic generation; Nonlinear optics; Devices
Quasi phase matching (QPM) is an efficient method for
second harmonic generation (SHG) of a pump wave in a
nonlinear crystal [1]. It is common to use collinear interac-
tions, where the pump wave and the second harmonic (SH)
wave propagate in the same direction thereby enabling
large interaction lengths and efficient conversion. However,


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


Collections: Engineering