On-chip multi-color microdisk laser on Yb3+-doped thin-film lithium niobate

TL;DR

This paper reports the development of an on-chip Yb3+-doped lithium niobate microdisk laser with high quality factors, multi-wavelength emission, low threshold, and nonlinear frequency generation, advancing integrated photonic applications.

Contribution

It introduces a novel on-chip Yb3+-doped lithium niobate microdisk laser with high Q-factors, multi-mode operation, and nonlinear frequency conversion capabilities.

Findings

Quality factors up to 3.79x10^5 at 976 nm and 1.1x10^6 at 1514 nm.

Low lasing threshold of 103 μW and slope efficiency of 0.53%.

Generation of second-harmonic and sum-frequency signals in the microdisk.

Abstract

We demonstrate an on-chip Yb3+-doped lithium niobate (LN) microdisk laser. The intrinsic quality factors of the fabricated Yb3+-doped LN microdisk resonator are measured up to 3.79x10^5 at 976 nm wavelength and 1.1x10^6 at 1514 nm wavelength. The multi-mode laser emissions are obtained in a band from 1020 nm to 1070 nm pumped by 984 nm laser and with the low threshold of 103 {\mu}W, resulting in a slope efficiency of 0.53% at room temperature. Furthermore, the second-harmonic frequency of pump light and the sum-frequency of the pump light and laser emissions are both generated in the on-chip Yb3+-doped LN microdisk benefited from the strong \c{hi}(2) nonlinearity of LN. These microdisk lasers are expected to contribute to the high-density integration of LNOI-based photonic chip.