Fig. 5: Kerr frequency comb generation for TM-polarised light.
From: Raman lasing and soliton mode-locking in lithium niobate microresonators
a Kerr oscillation for the TM mode from an X-cut LN microresonator as the pump laser is red-detuned into the cavity resonance (top to bottom). b RF spectra corresponding to States (ii) and (iii) in a. c Transmission measurement of the microresonator output above 1570 nm, which excludes the pump wavelength. The laser is tuned to the resonance as the wavelength increases, dominated by the thermal-optic effect. The laser sweeping speed is 80 pm/ms. d Zoom-in of the transmission trace in c, which shows the onset of the soliton step.
