# Efficient quasi-phase-matched frequency conversion in a lithium niobate racetrack microresonator

## TL;DR

This paper demonstrates highly efficient second harmonic generation in a lithium niobate racetrack microresonator with high quality factor and quasi-phase-matching, achieving significant conversion efficiency.

## Contribution

The work introduces a novel high-Q lithium niobate racetrack microresonator enabling efficient quasi-phase-matched frequency conversion.

## Key findings

- Normalized conversion efficiency of about 3.8% per mW
- High quality factor of approximately 5.3×10^5
- Effective quasi-phase-matching in microresonator

## Abstract

We demonstrate efficient second harmonic generation in a quasi-phase-matched, high quality factor ($Q_0 \approx 5.3\times 10^5$) racetrack microresonator. The observed normalized conversion efficiency is about $3.8\%~mW^{-1}$.