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- Title
Modulation-free laser stabilization technique using integrated cavity-coupled Mach-Zehnder interferometer.
- Authors
Idjadi, Mohamad Hossein; Kim, Kwangwoong; Fontaine, Nicolas K.
- 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. Stable lasers are crucial in many applications like sensing. Here, the authors demonstrate a laser frequency locking method that maintains performance, eliminates modulation, simplifies architecture, and enables miniaturization on a photonic chip.
- Subjects
LASERS; INTERFEROMETERS; FREQUENCY discriminators; NOISE measurement; QUALITY factor
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-46319-3