Orientation light shift suppression in alkali atoms microwave standards with laser pumping

C. Affolderbach, C. Andreeva, S. Cartaleva +3 more

Alexey Baranov, Ермак Сергей Викторович, V. V. Semenov

This work presents analytical studies of the orientation and light frequency shifts in microwave standards with regard to tensor component. It was shown that modulation technique application not only allows eliminating light shift but also provides significant reduction of the frequency errors introduced by external magnetic field orientation fluctuations while pumping alkali atoms with either D1 or D2 line.

Raoul Gregory Vitale

A. A. Baranov, Ермак Сергей Викторович, E. A. Sagitov +2 more

The contributions of the vector and scalar components to the magnetically dependent microwave transition frequency light shift are analyzed and the compensation of these components is experimentally demonstrated for the 87Rb atoms optically oriented by a laser tuned to the D 2 line of the head doublet. The Allan variance is studied as a function of the averaging time for a tandem of optically pumped quantum magnetometers (OPQMs), one of which is based on a low-frequency spin oscillator while another is based on a quantum microwave discriminator with a resonance frequency that corresponds to magnetically dependent transitions between HFS sublevels with the extremal value of the magnetic quantum number. It is shown that the compensation of the scalar and vector components of the light shift in OPQMs reduces the Allan variance at averaging times that exceed hundreds of seconds compared to a quantum discriminator based on the magnetically independent 0–0 transition. In this case, the minimal Allan variance in OPQMs at the end resonance is achieved at considerably longer averaging times than in the case of the quantum discriminator that is tuned to the 0–0 transition frequency.

M. Allegrini

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.