Towards visible soliton microcomb generation

Seung Hoon Lee, Dong Yoon Oh, Qi-Fan Yang, Boqiang Shen, Heming Wang, Ki Youl Yang, Yu-Hung Lai, Xu Yi, Xinbai Li and Kerry Vahala ()
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Seung Hoon Lee: California Institute of Technology
Dong Yoon Oh: California Institute of Technology
Qi-Fan Yang: California Institute of Technology
Boqiang Shen: California Institute of Technology
Heming Wang: California Institute of Technology
Ki Youl Yang: California Institute of Technology
Yu-Hung Lai: California Institute of Technology
Xu Yi: California Institute of Technology
Xinbai Li: California Institute of Technology
Kerry Vahala: California Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Frequency combs have applications that extend from the ultra-violet into the mid-infrared bands. Microcombs, a miniature and often semiconductor-chip-based device, can potentially access most of these applications, but are currently more limited in spectral reach. Here, we demonstrate mode-locked silica microcombs with emission near the edge of the visible spectrum. By using both geometrical and mode-hybridization dispersion control, devices are engineered for soliton generation while also maintaining optical Q factors as high as 80 million. Electronics-bandwidth-compatible (20 GHz) soliton mode locking is achieved with low pumping powers (parametric oscillation threshold powers as low as 5.4 mW). These are the shortest wavelength soliton microcombs demonstrated to date and could be used in miniature optical clocks. The results should also extend to visible and potentially ultra-violet bands.

Date: 2017
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DOI: 10.1038/s41467-017-01473-9

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