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. 2020 Jan 20;9:9. doi: 10.1038/s41377-020-0246-7

Fig. 5. Kerr frequency comb generation for TM-polarised light.

Fig. 5

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.