Collinear and isotropic diffraction of laser beam and incoherent light on periodically poled domain structures in lithium niobate

ABSTRACT

Possible variants of light diffraction from periodically poled domain structures in lithium niobate crystal are analyzed theoretically. It is shown that along with isotropic diffraction, elastic strains created by domain walls make it possible to observe the collinear interaction of ordinary and extraordinary waves propagating along X axis of the crystal. Diffraction of incoherent light in the collinear geometry on the PPLN with spatial period of 6.89 μm, developed on the basis of a Z-cut MgO:LiNbO₃ crystal using electric-field poling, is investigated experimentally.

KEYWORDS:

• Periodically poled domain structures
• lithium niobate
• isotropic diffraction
• collinear diffraction

Acknowledgments

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used.

Funding

This work was financially supported by the Ministry of Education and Science of the Russian Federation within the State project for 2015 and the task No. 3.878.2014/K of the project part. The research was made possible in part by the Ministry of Education and Science of the Russian Federation (UID RFMEFI59414X0011), by RFBR (Grants 13-02-01391-a, Grant 15-32-21102-mol_a_ved) and by Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006).