Modulation spectroscopy of coherent population trapping resonance and light shifts

Chuchelov, D. S.; Vassiliev, V. V.; Vaskovskaya, M. I.; Velichansky, V. L.; Tsygankov, E. A.; Zibrov, S. A.; Petropavlovsky, S. V.; Yakovlev, V. P.

doi:10.1088/1402-4896/aae1a0

Cited by 21 publications

(3 citation statements)

References 40 publications

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“…For this purpose, we plan to use an optical chopper or an electro-optic modulator [34] that may aid us in the analyze the sensor in short intervals of time. This is particularly important for the sake of spectral analysis of the sensor that will help us in the analysis of the samples of interest, and can be done with the help of an arrangement [35] that involves a beam splitter and a coherent source of laser light.…”

Section: Discussionmentioning

confidence: 99%

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Masud

Ali

Ikram³

2020

Phys. Scr.

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This work is concerned with the characterization of the fiber based laser sensor by means of relative intensity noise (RIN). The characterization has been done by an electrical based measurement system, which has been accomplished by the implementation of an optical receiver setup. The optical receiver setup has been built by using commercially available low noise amplifier (LNA), Bias Tee, and fast photodiode (FPD). Besides the optical receiver setup designing, software in Labview has been built and implemented to enable easy and fast measurement of data from measurement instruments. Using the self assembled optical receiver and an electrical spectrum analyzer (ESA), optical fluctuation ’noise’ of the fiber based laser sensor has been measured. We have found good agreement between the measurement results taken by our measurement setup and costly Agilent RIN measurement setup. Also, average RIN over wide frequency range has been calculated and discussed for different operating states of the laser sensor. The results are applicable in the field of an optical sensor.

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Section: Discussionmentioning

confidence: 99%

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Masud

Ali

Ikram³

2020

Phys. Scr.

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“…We consider modulation spectroscopy of the CPT resonances [53]. The crucial point of this technique is the time-harmonic perturbation of the Ω frequency's phase with the index a, ϕ(t) = a sin ω m t. This modulation provides dispersive-shape response at the frequency ω m in the absorption coefficient κ(t) of the optical field by an atomic ensemble.…”

Section: Theory a Model And Initial Equationsmentioning

confidence: 99%

“…The relaxation term Γg of the coherence takes into account the power broadening, Γg = Γ g + V L + V R . The two-photon detuning δ accounts the light shift, 2 δ = 2δ + δ r + δ nr , where δ r is the resonant light shift, and δ nr is the non-resonant light shift [5,9,19,53] from all components of the optical…”

Section: B Analytical Solutionmentioning

confidence: 99%

Intensity nonlinearity of the error-signal frequency shift in the modulation spectroscopy of dark resonances and approaches to its reduction

Tsygankov,

Petropavlovsky,

Vaskovskaya

et al. 2020

Preprint

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We study modulation spectroscopy of the coherent population trapping resonances and the frequency shift's structure of a corresponding error-signal used to stabilize an atomic clock frequency. The analytical expression of the shift is obtained in the model of the double Λ-system of levels interacting with the asymmetric polychromatic optical field. They reveal that the error-signal frequency can be displaced from that of "0 − 0" transition unperturbed by the optical field, although the frequency is not sensitive to changes in its intensity. Along with this effect, the degree of sensitivity suppression decreases. The experiment with 87 Rb atoms in Ar-N2 buffer gas atomic cell shows how the displacement value depends on different parameters, such as the modulation frequency, the absorption level, and the laser frequency. The possible influence of the effect on the clocks' frequency stability and reproducibility are discussed.

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Central Ramsey fringe identification by means of an auxiliary optical field

Chuchelov

Tsygankov

Zibrov

et al. 2019

Journal of Applied Physics

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We propose and demonstrate a simple technique for identifying the central Ramsey fringe of pulsed coherent population trapping resonance. An auxiliary optical field is applied during the free evolution time. It suppresses the nearby fringes but does not change the amplitude of central fringe practically, which marks it out clearly. The theory based on the density matrix equations for the Λ-system configuration of levels and Ramsey interrogation that takes into account the auxiliary optical field is presented and compared to the experiment with 87Rb atoms. We also propose a technique for improving the middle- and long-term stability of compact atomic clocks.

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Modulation spectroscopy of coherent population trapping resonance and light shifts

Cited by 21 publications

References 40 publications

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Calibration and stability of highly sensitive fibre based laser through relative intensity noise

Intensity nonlinearity of the error-signal frequency shift in the modulation spectroscopy of dark resonances and approaches to its reduction

Central Ramsey fringe identification by means of an auxiliary optical field

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