期刊
LASER & PHOTONICS REVIEWS
卷 15, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202000353
关键词
frequency combs; microresonators; multimode; nonlinear optics; soliton; ultralow loss
资金
- National Science Foundation [OMA-1936345]
- Defense Advanced Research Projects Agency [HR0011-19-2-0014]
- Air Force Office of Scientific Research [FA9550-15-1-0303, FA8650-19-C-1002]
- China Scholarship Council
Low propagation loss in high confinement waveguides is achieved by shaping the mode using a highly multimode structure to reduce overlap with waveguide interfaces, without the need for sophisticated fabrication processes. Experimental demonstration of microresonators with intrinsic quality factors of 31.8 +/- 4.4 million is provided, showing the generation of a broadband single-soliton frequency comb without higher order modes.
Low propagation loss in high confinement waveguides is critical for chip-based nonlinear photonics applications. Sophisticated fabrication processes which yield sub-nm roughness are generally needed to reduce scattering points at the waveguide interfaces to achieve ultralow propagation loss. Here, ultralow propagation loss is shown by shaping the mode using a highly multimode structure to reduce its overlap with the waveguide interfaces, thus relaxing the fabrication processing requirements. Microresonators with intrinsic quality factors (Q) of 31.8 +/- 4.4 million are experimentally demonstrated. Although the microresonators support ten transverse modes only the fundamental mode is excited and no higher order modes are observed when using nonlinear adiabatic bends. A record-low threshold pump power of 73 mu W for parametric oscillation is measured and a broadband, almost octave spanning single-soliton frequency comb without any signatures of higher order modes in the spectrum spanning from 1097 to 2040 nm (126 THz) is generated in the multimode microresonator. This work provides a design method that can be applied to different material platforms to achieve and use ultrahigh-Q multimode microresonators.
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