Simultaneously generating Brillouin microlaser and second harmonic within a lithium niobate microdisk
Abstract
We report the simultaneous generation of second-harmonic generation (SHG) and Brillouin microlaser in a high-quality thin-film lithium niobate (TFLN) microdisk resonator. The microdisk is fabricated with ultrahigh-Q factor of 4X10(6) by photolithography-assisted chemo-mechanical etching, enabling significant cavity-enhancement effect for boosting nonlinear frequency conversion. Under 1559.632 nm pumping, Brillouin microlaser is demonstrated in the microdisk with Stokes Brillouin shift of 10 GHz, a low threshold of 1.81 mW, and a fundamental linewidth of 254.365 Hz. Meanwhile, efficient SHG is observed at 779.816 nm with an absolute conversion efficiency of 3.8% at pump level of 3.028 mW. The coexistence of these two nonlinear processes is enabled by the simultaneous confinement of the light and acoustic fileds for effect coupling in the microdisk, which enhances both optomechanical and second-order nonlinear interactions. This research provides new possibilities for integrated multi-frequency laser sources and multifunctional nonlinear photonic devices.
Cite
@article{arxiv.2503.23706,
title = {Simultaneously generating Brillouin microlaser and second harmonic within a lithium niobate microdisk},
author = {Xiaochao Luo and Chuntao Li and Jintian Lin and Renhong Gao and Yifei Yao and Yingnuo Qiu and Lei Wang and Ya Cheng},
journal= {arXiv preprint arXiv:2503.23706},
year = {2025}
}
Comments
4 pages, 4 figures