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Synchronization of nonsolitonic Kerr combs
Bok Young Kim1, Jae K Jang1, Yoshitomo Okawachi1
1Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA.
Science Advances
|October 20, 2021
Summary
We demonstrate all-optical synchronization of Kerr frequency combs in the normal group velocity dispersion (GVD) regime. This extends comb synchronization beyond the soliton regime, enabling efficient microresonator platforms for coherent combining.
Area of Science:
- Nonlinear optics and photonics
- Quantum optics and laser physics
Background:
- Synchronization is a key phenomenon in coupled nonlinear oscillators, crucial for applications like coherent beam combining.
- Kerr frequency comb synchronization has been achieved in the anomalous group velocity dispersion (GVD) soliton regime.
- The normal GVD regime offers potential for combs with flat spectral profiles and high efficiency.
Purpose of the Study:
- To demonstrate all-optical synchronization of Kerr frequency combs in the normal GVD regime.
- To explore the universality of Kerr comb synchronization beyond the soliton regime.
- To enable efficient microresonator platforms for spectrally flat, high-power combs.
Main Methods:
- Experimental implementation of coupled Kerr oscillators in the normal GVD regime.
- Utilizing microresonator platforms for efficient optical coupling and comb generation.
- Characterization of synchronized comb properties, including spectral flatness and conversion efficiency.
Main Results:
- Successful all-optical synchronization of Kerr frequency combs in the normal GVD regime.
- Generation of phase-locked combs with high pump-to-comb conversion efficiencies.
- Observation of relatively flat spectral profiles in the synchronized normal GVD combs.
Conclusions:
- Kerr comb synchronization is a universal phenomenon, not limited to the soliton regime.
- Synchronization in the normal GVD regime provides a pathway to spectrally flat, high-power combs.
- This work paves the way for efficient microresonator-based coherent comb combining.
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