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We report an on-chip single mode microlaser with low-threshold fabricated onErbium doped lithium niobate on insulator (LNOI). The single mode laseremission at 1550.5 nm wavelength is generated in a coupled photonic molecule,which is facilitated by Vernier effect when pumping the photonic molecule at970 nm. A threshold pump power as low as 200 uW is demonstrated thanks to thehigh quality factor above 10^6. Moreover, the linewidth of the microlaserreaches 4 kHz, which is the best result in LNOI microlasers. Such single modemicro-laser lithographically fabricated on chip is highly in demand by photoniccommunity.

On-chip ultra-narrow-linewidth single-mode microlaser on lithium niobate on insulator