Photonic chip-based soliton frequency combs covering the biological imaging window

Maxim Karpov, Martin H. P. Pfeiffer, Junqiu Liu, Anton Lukashchuk and Tobias J. Kippenberg ()
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Maxim Karpov: Laboratory of Photonics and Quantum Measurements (LPQM)
Martin H. P. Pfeiffer: Laboratory of Photonics and Quantum Measurements (LPQM)
Junqiu Liu: Laboratory of Photonics and Quantum Measurements (LPQM)
Anton Lukashchuk: Laboratory of Photonics and Quantum Measurements (LPQM)
Tobias J. Kippenberg: Laboratory of Photonics and Quantum Measurements (LPQM)

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Dissipative Kerr solitons (DKS) in optical microresonators provide a highly miniaturised, chip-integrated frequency comb source with unprecedentedly high repetition rates and spectral bandwidth. To date, such frequency comb sources have been successfully applied in the optical telecommunication band for dual-comb spectroscopy, coherent telecommunications, counting of optical frequencies and distance measurements. Yet, the range of applications could be significantly extended by operating in the near-infrared spectral domain, which is a prerequisite for biomedical and Raman imaging applications, and hosts commonly used optical atomic transitions. Here we show the operation of photonic-chip-based soliton Kerr combs driven with 1 micron laser light. By engineering the dispersion properties of a Si3N4 microring resonator, octave-spanning soliton Kerr combs extending to 776 nm are attained, thereby covering the optical biological imaging window. Moreover, we show that soliton states can be generated in normal group–velocity dispersion regions when exploiting mode hybridisation with other mode families.

Date: 2018
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DOI: 10.1038/s41467-018-03471-x

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