Origin of second-harmonic generation in the incommensurate phase of K2SeO4

TL;DR

This paper investigates the origin of second-harmonic generation in K2SeO4, revealing that a ferroelectric phase transition in the incommensurate phase explains the observed nonlinear optical behavior.

Contribution

It demonstrates that the ferroelectric transition in the incommensurate phase accounts for second-harmonic generation in K2SeO4, providing insight into its nonlinear optical properties.

Findings

Ferroelectric phase transition occurs in the incommensurate phase.

Second-harmonic generation is explained by ferroelectricity in this phase.

The ferroelectric character persists over a specific temperature range.

Abstract

We show that a ferroelectric phase transition takes place in the incommensurate phase of the K2SeO4 crystal. The ferroelectric character of the IC phase explains the second-harmonic generation observed in the corresponding temperature range.