SUPPRESSION OF LIGHT SHIFT OF COHERENT POPULATION TRAPPING RESONANCES IN CESIUM VAPOR USING DOUBLE FREQUENCY AND AMPLITUDE MODULATION OF LASER RADIATION
- Authors: Vishnyakov V.I1, Brazhnikov D.V1, Skvortsov M.N1
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Affiliations:
- Institute of Laser Physics, Siberian Branch of the Russian Academy of Sciences
- Issue: Vol 166, No 4 (2024)
- Pages: 548-555
- Section: Articles
- URL: https://journals.rcsi.science/0044-4510/article/view/268181
- DOI: https://doi.org/10.31857/S0044451024100110
- ID: 268181
Cite item
Abstract
The light (ac Stark) shift of coherent population trapping (CPT) resonances in cesium vapor is studied under excitation by radiation from a vertical-cavity surface-emitting laser, whose current is modulated at a microwave frequency (≈ 4.6 GHz). This approach is used in some state-of-the-art microwave quantum frequency standards (QFS). One of the main factors leading to degradation of long-term frequency stability of QFS is associated with the light shift of the CPT resonance due to variations in optical power P in the vapor cell. In this work, it is shown that using an additional electro- optic modulator assembled as a Mach-Zehnder interferometer makes it possible to effectively control the amplitudes of sidebands in the radiation spectrum. This allows finding such an optimal optical power value near which the resonance shift is insensitive to its small changes. The results are of interest for the development of CPT-based QFS.
About the authors
V. I Vishnyakov
Institute of Laser Physics, Siberian Branch of the Russian Academy of Sciences
Email: vladislav.vishnyakov@gmail.com
Russian Federation, Novosibirsk, 630090
D. V Brazhnikov
Institute of Laser Physics, Siberian Branch of the Russian Academy of Sciences
Email: vladislav.vishnyakov@gmail.com
Russian Federation, Novosibirsk, 630090 Russia
M. N Skvortsov
Institute of Laser Physics, Siberian Branch of the Russian Academy of Sciences
Author for correspondence.
Email: vladislav.vishnyakov@gmail.com
Russian Federation, Novosibirsk, 630090
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