Abstract
We demonstrate an on-chip ${{\rm Yb}^{3 +}}$-doped lithium niobate (LN) microdisk laser. The intrinsic quality factors of the fabricated ${{\rm Yb}^{3 +}}$-doped LN microdisk resonator are measured up to ${3.79} \times {{10}^5}$ at a 976 nm wavelength and ${1.1} \times {{10}^6}$ at a 1514 nm wavelength. The multi-mode laser emissions are obtained in a band from 1020 to 1070 nm pumped by a 984 nm laser and with the low threshold of $103\;\unicode{x00B5}{\rm W}$, resulting in a slope efficiency of 0.53% at room temperature. Furthermore, both the second-harmonic frequency of pump light and the sum frequency of the pump light and laser emissions are generated in the on-chip ${{\rm Yb}^{3 +}}$-doped LN microdisk, benefiting from the strong ${\chi ^{(2)}}$ nonlinearity of LN. These microdisk lasers are expected to contribute to the high-density integration of a lithium niobate on insulator-based photonic chip.
© 2021 Optical Society of America
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