Circular dichroism in atomic vapors: Magnetically induced transitions responsible for two distinct behaviors

Sargsyan, A.; Amiryan, A.; Tonoyan, A.; Klinger, Emmanuel; Sarkisyan, D.

doi:10.1016/j.physleta.2020.127114

Cited by 24 publications

(21 citation statements)

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“…the amplitude of the EIT-resonance) to the peak absorption of the vapors when the coupling radiation is absent [26]. Details on the NC construction and characterization can be found in [9]. Thanks to the small size of the vapor column probed by the laser beam, strong permanent magnets can be used.…”

Section: Methodsmentioning

confidence: 99%

“…These calculations have been performed using the theoretical model presented in [3,7,9], which describes the change in the probabilities and frequencies of atomic transitions in the magnetic field using the Hamiltonian matrix including all transitions of the hyperfine manifold. Probabilities (arb.…”

Section: Cs D 2 Line In a Magnetic Fieldmentioning

confidence: 99%

“…Magnetically-induced (MI) transitions, obeying the apparent selection rule F e − F g ≡ ∆F = ±2, are forbidden at zero magnetic field. For alkali atoms (Cs, Rb, K, Na), MI transitions represent a large class consisting of about 100 atomic transitions exhibiting interesting and important specific features [3][4][5][6][7][8][9]. Interest in MI transitions is mainly due to the fact that their probabilities in a certain range of magnetic field can considerably exceed probabilities of conventional atomic transitions allowed in the absence of magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Coherent Optical Processes on Cs D$_2$ line Magnetically Induced Transitions

Sargsyan,

Amiryan,

Tonoyan

et al. 2022

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The increased spectral resolution allowed by the use of extremely thin vapor cells has led to the observation of interesting behaviour of alkali transitions when placed in a magnetic field. Particularly, transitions obeying an apparent F e − F g ≡ ∆F = ±2 selection rule, referred to as magneticallyinduced (MI) transitions, have their probabilities largely increase in the intermediate interaction regime while being null at zero and higher magnetic fields. With an 800 nm-thick Cs vapor cell placed in a field up to 1.5 kG, we show here that the generation of electromagnetically induced transparency (EIT), realized in Λ-systems involving ∆F = −2 MI transitions, is only possible when both the coupling and probe beams are σ − -circular polarized, demonstrating that EIT is affected by magnetic circular dichroism. A similar rule of thumb can be extrapolated for ∆F = +2 MI transitions and σ + polarization. Because of the high frequency shift slope (typ. 4 MHz/G), the generation of EIT resonances involving MI transitions is interesting, especially in the context of growing attention towards micro-machined alkali vapor cell sensors.

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Section: Methodsmentioning

confidence: 99%

Section: Cs D 2 Line In a Magnetic Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coherent Optical Processes on Cs D$_2$ line Magnetically Induced Transitions

Sargsyan,

Amiryan,

Tonoyan

et al. 2022

Preprint

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“…However, at B > 100 G, there is a giant increase in their probabilities. These transitions are therefore called magnetically induced (MI) [1][2][3][4][5][6][7][8]. Interest in MI transitions is due to the fact that in certain intervals of magnetic fields, their probabilities can significantly exceed the probabilities of ordinary atomic transitions allowed at B = 0.…”

Section: Introductionmentioning

confidence: 99%

“…It was demonstrated in [8] that the strongest transition of the MI2 group (transition 3 ′ → 5 ′ of Cs, nuclear spin I = 7/2) when using σ + radiation is the σ + transition |3, −3 → |5 ′ , −2 ′ . Its intensity is approximately 2 times higher (in the range of magnetic fields 0.2 kG -5 kG) than the intensity of the strongest σ − MI2 transition.…”

Section: Introductionmentioning

confidence: 99%

Strongest Magnetically Induced Transitions in Alkali Metal Atoms with nuclear spin $3/2$

Sargsyan,

Tonoyan,

Momier

et al. 2021

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The probabilities of atomic transitions Fe−Fg = ±2 between a ground Fg and an excited Fe level of D2 line of any alkali metal atom are zero when no external magnetic field is applied. In an external magnetic field in the range 0.1 − 3 kG, the probabilities of these transitions called magnetically induced (MI) are highly modified. For these MI transitions, we have previously exhibited the following rule: the probabilities of MI transitions with ∆F = +2 are maximal when using σ +polarized laser radiation, while the probabilities of MI transitions with ∆F = −2 are maximal when using σ − -polarized laser radiation. This difference has been termed Type 1 Magnetically Induced Circular Dichroism (MCD1). It is demonstrated for the first time that for alkali atoms with a nuclear spin I = 3/2 ( 87 Rb, 39 K, 23 Na, 7 Li) in magnetic fields > 100 G, the probability of the strongest σ + MI transition of the group Fg = 1 → Fe = 3 ′ (transition |1, −1 → |3 ′ , 0 ′ ) is about 4 times higher than the probabilities of the strongest MI σ − -transitions |1, −1 → |3 ′ , −2 ′ and |2, +1 → |0 ′ , 0 ′ . These properties make the σ + MI transition |1, −1 → |3 ′ , 0 ′ an interesting candidate for the study of magneto-optical processes in strong magnetic fields.

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