Linear diffraction of light waves in periodically poled lithium niobate crystal

ABSTRACT

Results of theoretical analysis of dielectric permittivity perturbations in lithium niobate crystal with periodically poled domain structure are presented. The deviation of periodical domain structure duty cycle from 0.5 and the electric bias field created by point defects are taken into consideration. The isotropic diffraction with many maxima is considered as a boundary problem for symmetric propagation of probing beam. The agreement between numerical analysis and experimental study of the isotropic diffraction patterns performed for laser beam polarized along domain walls and propagating along polar axis through the periodically poled domain structure confirmed the proposed theoretical model.

KEYWORDS:

• Periodical poling
• domain structure
• lithium niobate
• isotropic diffraction
• collinear diffraction

Acknowledgments

This work was supported in part by the State Assignment of the Ministry of Education and Science of the Russian Federation for 2015–2016, R&D under the Project of State Assignment No. 3.878.2014/IK, and the RFBR (grant No. 16-29-14046-ofr_m). The equipment of the Ural Center for Shared Use “Modern Nanotechnology” UrFU has been used. The research was made possible in part by Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006). V.S. acknowledges financial support within the State Task from the Ministry of Education and Science of the Russian Federation (project No. 1366.2014/236).