Sech-squared Pockels solitons in the microresonator parametric down-conversion

TL;DR

This paper introduces a sech-squared soliton solution based on the Pockels effect in optical microresonators, highlighting differences from Kerr solitons and aligning with recent experimental data.

Contribution

It provides an explicit analytical sech-squared soliton solution for Pockels effect-driven frequency combs in microresonators, expanding understanding of quadratic nonlinearities.

Findings

Predicted spectral profile differences between Pockels and Kerr solitons.

Identified pump power thresholds consistent with recent experiments.

Compared Pockels solitons with cascaded-Kerr solitons in spectral and power characteristics.

Abstract

We present an explicit sech-squared-soliton solution associated with the optical Pockels effect, achieved through the generation of the frequency combs via parametric down-conversion in optical microresonators with quadratic nonlinearity. This soliton contrasts the parametric sech-soliton describing the half-harmonic field in the limit of the large index mismatch, and associated with the cascaded-Kerr effect. We predict differences in the spectral profiles and powers of the Pockels and cascaded-Kerr solitons, and report that the pump power threshold of the former agree with the recent experimental observations.