期刊
NATURE PHOTONICS
卷 15, 期 1, 页码 21-27出版社
NATURE PORTFOLIO
DOI: 10.1038/s41566-020-00704-8
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资金
- DARPA SCOUT [W31P4Q-15-1-0006]
- DARPA's ACES programmes as part of the Draper-NIST collaboration [HR0011-16-C-0118]
- NSF EFRI [EFMA-1640959]
- David and Lucile Packard Foundation
Kerr soliton microcombs have been a popular topic in integrated photonics, but Pockels soliton microcombs driven by quadratic photonic materials show unique advantages in nanophotonic platforms, with high soliton generation fidelity and efficient pump-to-soliton conversion.
Kerr soliton microcombs have recently emerged as a prominent topic in integrated photonics and have enabled new horizons for optical frequency metrology. Kerr soliton microcombs, as the name suggests, are based on high-order cubic optical nonlinearity. It is desirable to exploit quadratic photonic materials, namely Pockels materials, for soliton generation and on-chip implementation of 1f-2f comb self-referencing. Such quadratically driven solitons have been proposed theoretically, but have not yet been observed in a nanophotonic platform, despite recent progress in quadratic comb generation in free-space and crystalline resonators. Here, we report photonic-chip-based Pockels microcomb solitons driven by three-wave mixing in an aluminium nitride microring resonator. In contrast to typical Kerr solitons, the Pockels soliton features unity soliton generation fidelity, two-by-two evolution of multi-soliton states, favourable tuning dynamics and high pump-to-soliton conversion efficiency.
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