%0 Electronic Article %A Liu, Xianwen and Sun, Changzheng and Xiong, Bing and Wang, Lai and Wang, Jian and Han, Yanjun and Hao, Zhibiao and Li, Hongtao and Luo, Yi and Yan, Jianchang and Wei, Tongbo and Zhang, Yun and Wang, Junxi %I AIP Publishing %D 2018 %D 2018 %G English %@ 0003-6951 %@ 1077-3118 %~ Universitätsbibliothek "Georgius Agricola" %T Generation of multiple near-visible comb lines in an AlN microring via χ(2) and χ(3) optical nonlinearities %V 113 %J Applied Physics Letters %V 113 %N 17 %U http://dx.doi.org/10.1063/1.5046324 %X On-chip frequency upconversion of a near-infrared (NIR) Kerr comb in a χ(2) and χ(3) system provides a convenient route to extending the comb spectra into the visible band. Yet to date, only limited visible or near-visible comb lines have been obtained using this scheme. In this work, we demonstrate the generation of multiple near-visible comb lines based on spectral translation from a broadband NIR Kerr comb. This physical process is implemented in an aluminum nitride (AlN)-on-sapphire microring, where we achieve a wideband frequency upconversion by incorporating the phase-mismatched fundamental and first-order near-visible modes. Upon tuning the pump into the resonance with sufficient power, we attain a broadband NIR Kerr comb and 153 corresponding near-visible comb lines in 720–840 nm with a reasonable efficiency over 4.1 × 10−5%. The wideband frequency upconversion can be adapted to on-chip frequency stabilization of self-referenced microcombs, as required for precision optical clocks and frequency metrology. %Z https://katalog.ub.tu-freiberg.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTA2My8xLjUwNDYzMjQ %U https://katalog.ub.tu-freiberg.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTA2My8xLjUwNDYzMjQ