Orientational frequency shift of radio-optical quantum magnetometers

A A Baranov, Ермак Сергей Викторович, E. A. Sagitov +1 more

The paper is devoted to the investigation of mutual influence of low-frequency and microwave resonances in 87 Rb vapor cell magnetometers system with laser pumping. One of the magnetometers was based on a low-frequency spin generator principle, while the second one was built as passive microwave spectrometer with a resonance frequency lock loop. The paper analyzes the frequency shifts in the low-frequency and microwave channels of the tandem of magnetometers associated with the simultaneous action of the resonant radio fields on the alkali atoms. Such effect is manifested in the frequency shifts of the spin generator for fixed changes in the amplitude of the microwave field.

Evgenii B. Aleksandrov, Anton K. Vershovskii

Morgan W. Mitchell

E. A. Sagitov, Kseniia Lezhennikova, V. V. Semenov +2 more

The paper is devoted to the study of the relative influence of low-frequency and microwave signals of the system of two quantum magnetometers based on simultaneous induction of the spin generator signal on the resonance transition and the MZ-signal of the edge magnetically dependent microwave resonance. The "dressed" atom effect caused frequency shifts of low-frequency and microwave resonances is shown. The frequency shifts ratio of the spin generator to the microwave resonance was between 10 and 100, depending on the experimental conditions. The necessity of the using a circularly polarized low-frequency radio field is shown to reduce the radio-optical resonance frequency shifts caused by the mutual influence of the measuring channels of the magnetometers system.

Kai Bongs

Victor A. Kartoshkin

Subject of study. Magnetic resonance frequency shifts caused by spin exchange collisions involving optically oriented alkali atoms in the ground state are studied. Aim of study. Spin-exchange collisions involving optically oriented pairs of alkali atoms of different types are theoretically studied to determine the shifts in the magnetic resonance line frequencies as a function of temperature for various pairs of alkali atoms under various optical orientation conditions in order to determine optimum constraints for the construction of quantum magnetometers with optical pumping using mixtures of alkali atoms. Method. Collisions between optically oriented alkali atoms are analyzed within the framework of quantum scattering theory, and data on the interaction potentials of alkali-atom dimers are used to calculate the scattering phases for collisions involving these potentials and the imaginary parts of the complex spin-exchange cross-section. The resulting cross sections as a function of energy were used to determine the magnetic resonance frequency shifts as a function of temperature. Main results. The magnetic resonance line frequency shifts for the following pairs of alkali atoms were obtained as a function of temperature: 39K−133Cs, 39K−85Rb, and 133Cs−85Rb. The shift in the magnetic resonance line involving the F=1 hyperfine state for a 39K−85Rb alkali-atom pair was found to pass through zero near temperature 480 K. Practical significance. The results obtained in this paper can be used to develop zero-spin-exchange-shift quantum electronic devices based on the optical orientation of atoms. In particular, it is possible to develop co-magnetometers based on the optical orientation of alkali atoms.