Domain structure evolution under multiple pulse heating of lithium niobate by infrared laser

Abstract

Domain structure evolution in congruent lithium niobate single crystals under multiple infrared laser pulse irradiation was studied. The structure of narrow domain rays appeared after the first pulse became denser with pulse number due to ray widening and intensive fingering, which led to increasing the domain walls density. The almost constant wall density in the central region of irradiated zone significantly increased near the zone edge. Increase in the initial crystal temperature led to decrease in the wall density. The obtained radial dependence of the wall density was attributed to computer simulated spatial distribution of the pyroelectric field.

Keywords:

• Lithium niobate
• domain engineering
• pyroelectric field
• infrared laser

Acknowledgments

The equipment of Ural Center for Shared Use “Modern Nanotechnology” Ural Federal University was used.

Additional information

Funding

The research was made possible by Russian Science Foundation (grant No. 19-12-00210).