Abstract

We theoretically and experimentally investigate broadband manipulation of Stokes frequency comb generation in a silica microbottle resonator. We realize selective excitation of spectrally trapped Stokes combs belonging to distinct transverse mode families and a spectral tuning range up to ∼14.3 nm via coupling engineering by exciting distinct axial mode families with appropriate quality factors (Qs). Moreover, radial mode number selection, microcavity diameter control, or injection power adjustment also enables us to shift the Stokes comb wavelength. The tuning bandwidth can be extended to hundreds of nanometers by theoretical prediction using the bottle modal analysis and Coupled Lugiato Lefever (LL) equations simulation. We also show that multiple regimes in two-dimensional (2D) patterns can be selectively triggered depending on the cavity detuning, including Kerr frequency comb, single-frequency Raman lasing, multimode Raman lasing, and soliton crystal-like state. Our approach provides a scheme for greatly extending the wavelength tuning range of compact Raman laser devices with high performance.

Controllable two-dimensional Kerr and Raman–Kerr frequency combs in microbottle resonators with selectable dispersion

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Transverse mode interaction via stimulated Raman scattering comb in a silica microcavity

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Transition between Kerr comb and stimulated Raman comb in a silica whispering gallery mode microcavity

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J. Opt. Soc. Am. B 35(1) 100-106 (2018)

Phase-locking transition in Raman combs generated with whispering gallery mode resonators

Guoping Lin and Yanne K. Chembo
Opt. Lett. 41(16) 3718-3721 (2016)

Multiple nonlinear resonances and frequency combs in bottle microresonators

I. Oreshnikov and D. V. Skryabin
Opt. Express 25(9) 10306-10311 (2017)