Abstract
Lithium niobate (LiNbO3) crystals have been widely used in many nonlinear optical processes such as frequency conversion by quasi-phase matching (QPM). Frequency conversion requires high intensity laser light, which may induce optical damage to the crystal resulting in the distortion of the optical beam. Adequate magnesium oxide (MgO) doping in LiNbO3 can significantly reduced the optical damage [1]. QPM requires periodic domain inversion of the crystal’s spontaneous polarization Ps at submicron-to-few microns periods. A common method used for domain patterning of LiNbO3 is electric field poling (EFP). While this method is an effective way to achieve domain patterning in congruent LiNbO3, it is not always successful when applied to MgO-doped LiNbO3, due to a pronounced sideways domain spreading [2]. In this contribution, we report on the fabrication of bulk domain structures in MgO doped LiNbO3, which are pre-defined by a spatial modulation of the lithium (Li) concentration induced by strongly absorbed UV laser light irradiation.
© 2015 IEEE
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