Modulation-free laser stabilization technique using integrated cavity-coupled Mach-Zehnder interferometer

Mohamad Hossein Idjadi (), Kwangwoong Kim and Nicolas K. Fontaine
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Mohamad Hossein Idjadi: Nokia Bell Labs
Kwangwoong Kim: Nokia Bell Labs
Nicolas K. Fontaine: Nokia Bell Labs

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Stable lasers play a significant role in precision optical systems where an electro-optic laser frequency stabilization system, such as the Pound-Drever-Hall technique, measures laser frequency and actively stabilizes it by comparing it to a frequency reference. Despite their excellent performance, there has been a trade-off between complexity, scalability, and noise measurement sensitivity. Here, we propose and experimentally demonstrate a modulation-free laser stabilization method using an integrated cavity-coupled Mach-Zehnder interferometer as a frequency noise discriminator. The proposed architecture maintains the sensitivity of the Pound-Drever-Hall architecture without the need for any modulation. This significantly simplifies the architecture and makes miniaturization into an integrated photonic platform easier. The implemented chip suppresses the frequency noise of a semiconductor laser by 4 orders-of-magnitude using an on-chip silicon microresonator with a quality factor of 2.5 × 106. The implemented passive photonic chip occupies an area of 0.456 mm2 and is integrated on AIM Photonics 100 nm silicon-on-insulator process.

Date: 2024
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DOI: 10.1038/s41467-024-46319-3

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