Stabilization of domain structures in Rb-doped KTiOPO4 for high-temperature processes

Hoda Kianirad,Fredrik Laurell,Bertrand Ménaert,Alexandra Peña,Benoît Boulanger,Carlota Canalias,Andrius Zukauskas,Gustav Lindgren

doi:10.1063/1.5082246

Abstract

A way to stabilize the domain structure in periodically poled Rb-doped KTiOPO4 samples at high-temperatures is presented. The domain contraction along the b-crystallographic axis that is observed when crystals are annealed at high temperatures is suppressed when the ends of the domains along the b-axis are diced away. Additionally, the thermal stability of self-assembled domain gratings with a sub-μm average periodicity of 650 ± 200 nm and a domain-width of 225 ± 75 nm in mm-thick samples is investigated, and it is shown that the key factor for the domain stability is the domain width rather than the interdomain distance.

Highlights

In this work, we demonstrate that for Rb-doped KTP (RKTP) the domain contraction along the b-direction, that is observed when the crystals are annealed at high temperatures, can be suppressed if
We have recently shown that 1-mm-thick c-cut periodically poled RKTP (PPRKTP) samples show thermally induced anisotropic domain wall (DW) motion along the a- and b-crystallographic axes when they are annealed above 550 C.10
We found that bulk domain contraction along the b-axis was on the order of tens of micrometers, whereas in the a-direction it resulted in approximately three orders of magnitude lower domain wall displacement

Summary

Introduction

We demonstrate that for RKTP the domain contraction along the b-direction, that is observed when the crystals are annealed at high temperatures, can be suppressed if. We have recently shown that 1-mm-thick c-cut periodically poled RKTP (PPRKTP) samples show thermally induced anisotropic domain wall (DW) motion along the a- and b-crystallographic axes when they are annealed above 550 C.10 We found that bulk domain contraction along the b-axis was on the order of tens of micrometers, whereas in the a-direction it resulted in approximately three orders of magnitude lower domain wall displacement.

Results

Conclusion