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arXiv · 1611.01994

Broadband frequency comb generation in aluminum nitride-on-sapphire microresonators

Xianwen Liu·Changzheng Sun·Bing Xiong·Lai Wang·Jian Wang·Yanjun Han·Zhibiao Hao·Hongtao Li·Yi Luo·Jianchang Yan·Tongbo Wei·Yun Zhang·Junxi Wang
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Abstract

Development of chip-scale optical frequency comb with the coverage from ultra-violet (UV) to mid-infrared (MIR) wavelength is of great significance. To expand the comb spectrum into the challenging UV region, a material platform with high UV transparency is crucial. In this paper, crystalline aluminum nitride (AlN)-onsapphire film is demonstrated for efficient Kerr frequency comb generation. Near-infrared (NIR) comb with nearly octave-spanning coverage and low parametric threshold is achieved in continuous-wave pumped high-quality-factor AlN microring resonators. The competition between stimulated Raman scattering (SRS) and hyperparametric oscillation is investigated, along with broadband comb generation via Raman-assisted four-wave mixing (FWM). Thanks to its wide bandgap, excellent crystalline quality as well as intrinsic quadratic and cubic susceptibilities, AlN-on-sapphire platform should be appealing for integrated nonlinear optics from MIR to UV region.

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Xianwen Liu, Changzheng Sun, Bing Xiong, Lai Wang, Jian Wang, Yanjun Han, Zhibiao Hao, Hongtao Li, Yi Luo, Jianchang Yan, Tongbo Wei, Yun Zhang, Junxi Wang. 2016-11-07. Broadband frequency comb generation in aluminum nitride-on-sapphire microresonators. https://arxiv.org/abs/1611.01994

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