Sum-frequency generation of a laser and its background in an on-chip lithium-niobate microdisk

Lithium-niobate microcavities have not only the ability to resonantly enhance light–matter interaction but also excellent nonlinear optical properties, thereby providing an important platform for investigations. In this paper, we report observation of multi-peak spectra in near infrared range lithium-niobate on a chip under pump 1550 nm continuous laser. Such spectrum was attributed sum-frequency laser and its background. The conversion efficiencies processes are order 61.5%W-1. influences phenomenon were further discussed.