Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W

J Lu, JB Surya, X Liu, AW Bruch, Z Gong, Y Xu… - Optica, 2019 - opg.optica.org
Lithium niobate (LN), dubbed by many as the silicon of photonics, has recently risen to the
forefront of chip-scale nonlinear optics research since its demonstration as an ultralow-loss …