Fig. 3: Formation of dark pulse microcombs.
From: Broadband microwave-rate dark pulse microcombs in dissipation-engineered LiNbO3 microresonators
a Normalized transmitted pump power (top panel) and comb power (bottom panel) as a function of the increased pump laser frequency. b Optical spectrum of microcomb at MI state. Two Raman lasing modes are labeled with corresponding Raman shifts of 153 cm−1 and 628 cm−1. c Optical spectra of dark pulse microcombs with different comb line spacing. The left insets show the zoom-in views of the comb lines. The right inset shows the measured electrical beatnote of the 1-FSR microcomb with 10-Hz resolution bandwidth (RBW). d Optical spectra of dark pulse microcombs for two different laser-cavity detunings. The simulated spectral envelopes of the microcombs are also plotted. The detunings are inferred from the simulations as 364 MHz and 400 MHz for left and right panels, respectively. Insets: simulated intracavity waveforms.
