Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity*

Hu, Liang; Hu, Xiangming; Hu, Qili

doi:10.1088/1674-1056/abd76b

Cited by 2 publications

(1 citation statement)

References 55 publications

(124 reference statements)

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“…[9] When the three-level atom was coupled by a microwave field, the narrow spectral lines appeared in the spontaneous emission spectrum. [10] In the multi-level atom coupled by an external field, the multi-peak structure as well as multiple fluorescence quenching points were observed in the spontaneous emission spectrum. [11] There were more interesting quantum phenomena in the atom coupled by bichromatic excitation or polychromatic excitation.…”

Section: Introductionmentioning

confidence: 98%

Spontaneous emission from Λ-type three-level atom driven by bichromatic field in anisotropic double-band photonic crystals

Ling¹,

Li²,

Wan³

et al. 2023

Chinese Phys. B

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The spontaneous emission property of Λ-type three-level atom driven by the bichromatic field in the anisotropic double-band photonic crystal is calculated by n-times iteration method. The influence of different parameters on atomic spontaneous emission is studied, and the phenomena of atomic spontaneous emission are explained in the dressed state representation. It is found that the spontaneous emission spectra of the atom driven by the bichromatic field present a multi-peak comb structure. The position of the emission peak is determined by the initial state of the atom, and the interval between the neighboring emission peaks is the detuning δ of the bichromatic field. When the ratio between Rabi frequency intensity and the detuning δ of the bichromatic field remains unchanged, the intensity of each emitted peak remains invariant. The spontaneously emitted peak can be annihilated in the band gap and be enhanced near the band edge in the anisotropic photonic crystals. Meanwhile, we also observed the fluorescence quenching phenomenon in the spontaneous emission spectra. The research in this paper provides the theoretical guidance for the control of atomic spontaneous emission.

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Section: Introductionmentioning

confidence: 98%

Spontaneous emission from Λ-type three-level atom driven by bichromatic field in anisotropic double-band photonic crystals

Ling¹,

Li²,

Wan³

et al. 2023

Chinese Phys. B

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Measurement of microwave electric field based on electromagnetically induced transparency by using cold Rydberg atoms

fei¹,

Jia²,

Liu³

et al. 2023

Acta Phys. Sin.

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In this paper, we have theoretically and experimentally studied a quantum microwave electrometry in a cold atomic system using Rydberg electromagnetic induction transparency (EIT) and Autler-Townes splitting (EIT-AT splitting). We obtained spindle-shaped cold atomic clouds in a magneto-optical trap and then pumped cold atoms to quantum state 5S1/2，F=2，mF=2 by using the optical-pump laser. We obtained the Rydberg EIT spectrum peak with narrow linewidth by taking the advantages of the low temperature and small residual Doppler broadening. The results show that the typical EIT linewidth with 16 μK cold atoms is about 460 kHz which is 15 times narrowed than that of 7 MHz obtained in the thermal vapor cell. The microwave electric field amplitude is measured by EIT-AT splitting in the cold atoms for frequencies of 9.2 GHz, 14.2 GHz and 22.1 GHz , receptively. The results show that there is a good linear relationship between the EIT-AT splitting interval and the microwave electric field amplitude. The lower limit of the microwave electric field amplitude that can be measured in the linear region can reach as low as 222 μV/cm, which is enhanced about 22 times than that in the traditional thermal vapor cell about of 5 mV/cm. The improvement of the lower limit by EIT-AT splitting method is roughly scaled as the narrowing EIT line width by cold atom samples. This demonstrate that, benefiting from the smaller residual Doppler effect and the narrower EIT linewidth in cold atoms, the cold atom system is more advantageous in the experiment of measuring the weak microwave electric field amplitude by using the EIT-AT splitting method. This is of great benefit to the absolute calibration of very weak microwave electric fields. Furthermore, the lower limit of the microwave electric field amplitude that can be measured smaller than 1 μV/cm by using the change of transmittance of the prober laser at the EIT resonance, and the corresponding sensitivity can reach 1 μV/cm Hz-1/2. These results demonstrate the advantages of cold atomic sample in microwave electric field measurement and its absolute calibration.

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Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity*

Cited by 2 publications

References 55 publications

Spontaneous emission from Λ-type three-level atom driven by bichromatic field in anisotropic double-band photonic crystals

Spontaneous emission from Λ-type three-level atom driven by bichromatic field in anisotropic double-band photonic crystals

Measurement of microwave electric field based on electromagnetically induced transparency by using cold Rydberg atoms

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