“Branching Asymmetry” of the Coherent Population Trapping Resonance

The appearance of the population difference in the ground state of the -system due to the spontaneous decay of the upper level into lower ones is considered. The resulting asymmetry of the coherent population trapping resonance is shown to lead to a frequency shift of the quadrature signal, which no...

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Bibliographic Details
Published in:JETP letters 2024, Vol.120 (1), p.33-37
Main Authors: Tsygankov, E. A., Chuchelov, D. S., Vaskovskaya, M. I., Zibrov, S. A., Vassiliev, V. V., Velichansky, V. L.
Format: Article
Language:English
Subjects:
Asymmetry
Atomic
Binary mixtures
Biological and Medical Physics
Biophysics
Frequency shift
Ground state
Molecular
Optical and Plasma Physics
Optics and Laser Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quadratures
Quantum Information Technology
Resonance
Solid State Physics
Spintronics
Trapping
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Summary:The appearance of the population difference in the ground state of the -system due to the spontaneous decay of the upper level into lower ones is considered. The resulting asymmetry of the coherent population trapping resonance is shown to lead to a frequency shift of the quadrature signal, which nonlinearly depends on the optical field intensity. In this case, this contribution is not suppressed due to the use of high modulation frequencies compared to the relaxation rate of ground state polarization (analogue of the Pound–Drever–Hall technique). A significant smallness of this shift when using a binary mixture of noble buffer gases is discussed.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364024601842