Open AccessRaman–Kerr frequency combs in Zr-doped silica hybrid microresonators
Author(s) -
Hyungwoo Choi,
Andrea M. Armani
Publication year - 2018
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.43.002949
Subject(s) - raman scattering , raman spectroscopy , materials science , optics , frequency comb , dispersion (optics) , four wave mixing , doping , coherent anti stokes raman spectroscopy , optoelectronics , kerr effect , nonlinear optics , laser , physics , nonlinear system , quantum mechanics
Resonant cavity-enhanced Kerr frequency combs have been demonstrated using a range of cavity materials. Regardless of cavity type, one fundamental challenge is achieving low or flat dispersion while maintaining high-efficiency four-wave mixing (FWM). Here we demonstrate a Raman-Kerr frequency comb using a Zr-doped silica hybrid toroidal microcavity. The Zr-doped layer both flattens the dispersion and increases the stimulated Raman scattering efficiency. This enhancement enables the generation of FWM around both the Stokes and anti-Stokes Raman scattering emissions. As a result, the Raman-Kerr frequency comb spans more than 300 nm in the near-IR region with less than 5.2 mW of input power.