Highly-efficient second and third harmonic generation in a monocrystalline lithium niobate microresonator
Abstract
Nonlinear optics in whispering-gallery-mode (WGM) microresonators have attracted much attention. Owing to strong confinement of the light in a small volume, a WGM microresonator can dramatically boost the strength of light field, giving rise to enhancement of the nonlinear interactions of light with the resonator material. Here, we demonstrate highly efficient second harmonic generation (SHG) and third harmonic generation (THG) in an on-chip monocrystalline lithium niobate (LN) microresonator. Benefitting from a cyclic phase matching scheme for the transverse-electric WGMs, nonlinear wavelength conversion utilizing the largest second-order nonlinear coefficient d33, which has not been demonstrated until now despite of its obvious advantage, is successfully achieved in an X-cut LN microresonator. We obtain high conversion efficiencies in not only the SHG (3.8% mW^-1) but also the THG (0.3% mW^-2) realized through a cascaded sum-frequency process. Our results represent a major step toward the classical and quantum photonic integrated circuits.
Cite
@article{arxiv.1809.04523,
title = {Highly-efficient second and third harmonic generation in a monocrystalline lithium niobate microresonator},
author = {Jintian Lin and Yao Ni and Zhenzhong Hao and Jianhao Zhang and Wenbo Mao and Min Wang and Wei Chu and Rongbo Wu and Zhiwei Fang and Lingling Qiao and Wei Fang and Fang Bo and Ya Cheng},
journal= {arXiv preprint arXiv:1809.04523},
year = {2018}
}
Comments
23 pages, 4 figures