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- W2791662421 abstract "We investigate frequency-comb generation in normal dispersion silicon microresonators from the near-infrared to mid-infrared wavelength range in the presence of multiphoton absorption and free-carrier effects. It is found that parametric oscillation is inhibited in the telecom wavelength range resulting from strong two-photon absorption. On the contrary, beyond the wavelength of 2200 nm, where three- and four-photon absorption are less detrimental, a comb can be generated with moderate pump power, or free-carriers are swept out by a positive-intrinsic-negative structure. In the temporal domain, the generated combs correspond to flat-top pulses, and the pulse duration can be easily controlled by varying the laser detuning. The reported comb generation process shows a high conversion efficiency compared with anomalous dispersion regime, which can guide and promote comb formation in materials with normal dispersion. As the comb spectra cover the mid-infrared wavelength range, they can find applications in comb-based radiofrequency photonic filters and mid-infrared spectroscopy." @default.
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- W2791662421 date "2018-03-22" @default.
- W2791662421 modified "2023-10-17" @default.
- W2791662421 title "Influences of multiphoton absorption and free-carrier effects on frequency-comb generation in normal dispersion silicon microresonators" @default.
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- W2791662421 doi "https://doi.org/10.1364/prj.6.000238" @default.
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