Fig. 1: Experimental setup.
From: Raman lasing and soliton mode-locking in lithium niobate microresonators
a Schematic of the LN crystalline structure. The crystal axis is along the z-axis. b, c Orientation of the LN microresonator on an X-cut wafer. A 30-GHz free spectral range (FSR) racetrack resonator is used for the Raman characterisation. b A 250-GHz FSR microring resonator is used for the Raman–Kerr interactions. c The TE and TM polarisations are also indicated. d Setup for the forward (FW) and backward (BWD) Raman characterisation. EDFA erbium-doped fibre amplifier, BPF bandpass filter, FPC fibre polarisation controller, OSA optical spectrum analyser.
