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Cs microcell optical reference with frequency stability in the low 10-13 range at 1 s.
Optics Letters
|March 22, 2023
Summary
Researchers developed a high-performance optical frequency reference using dual-frequency sub-Doppler spectroscopy (DFSDS) and a cesium vapor microcell. This technology achieves excellent stability, paving the way for advanced optical standards.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Metrology and Measurement Science
Background:
- Optical frequency references are crucial for advanced scientific applications.
- Miniaturized atomic cells offer potential for compact and robust frequency standards.
Purpose of the Study:
- To demonstrate a high-performance optical frequency reference using dual-frequency sub-Doppler spectroscopy (DFSDS).
- To evaluate the stability and performance of a cesium vapor microcell-based laser system.
Main Methods:
- Utilized dual-frequency sub-Doppler spectroscopy (DFSDS) with a cesium vapor microfabricated cell.
- Employed an external-cavity diode laser operating at 895 nm.
- Compared the microcell-stabilized laser against a cavity-stabilized reference laser.
Main Results:
- Achieved a laser instability of 3 × 10-13 at 1 second.
- Observed a phase noise of +40 dBrad2/Hz at a 1-Hz offset frequency.
- Demonstrated stability below 5 × 10-14 at 102 seconds, consistent with intermodulation effects.
Conclusions:
- Dual-frequency sub-Doppler spectroscopy is a promising technique for developing ultra-stable optical standards.
- Microfabricated cesium vapor cells are suitable for creating compact and high-performance frequency references.
- The demonstrated performance validates the potential of DFSDS for next-generation metrology.
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