Abstract
Microresonator-based frequency comb generation at or near visible wavelengths would enable applications in precise optical clocks, frequency metrology, and biomedical imaging. Comb generation in the visible has been limited by strong material dispersion and loss at short wavelengths, and only very narrowband comb generation has reached below 800 nm. We use the second-order optical nonlinearity in an integrated high-Q silicon nitride ring resonator cavity to convert a near-infrared frequency comb into the visible range. We simultaneously demonstrate parametric frequency comb generation in the near-infrared, second-harmonic generation, and sum-frequency generation. We measure 17 comb lines converted to visible wavelengths extending to 765 nm.
Highlights
L. Gaeta, “Broadband parametric frequency comb generation with a 1-m pump source,” Opt. Express 20, 26935–26941 (2012)
As the cavity circulating power increases, the pump undergoes χ(3) four-wave mixing (FWM) optical parametric oscillation, which produces a frequency comb in the near-IR range (Fig. 1(b))
The phase-matching of the sum-frequency generation (SFG) process involves one photon from a comb line mixing with one photon from the strong pump
Summary
L. Gaeta, “Broadband parametric frequency comb generation with a 1-m pump source,” Opt. Express 20, 26935–26941 (2012). “Broadband microresonator-based parametric frequency comb generation near visible wavelengths,” in “CLEO: 2014,” (Optical Society of America, 2014). For microresonator-based comb generation, low anomalous group-velocity dispersion (GVD) is necessary for phase-matching and efficient four-wave mixing (FWM) and parametric oscillation [8].
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