We study the processes of optical pumping of alkali metal atoms in the gas cell with buffer gas for the quantum magnetometers. The value of pumped magnetic moment is strongly influenced by the collision effects. Collisions of alkali atoms with the buffer gas lead to partial destruction of the atomic quantum state. As a first approximation, we can assume that the state of electronic shell collapses, but the state of the nucleus is saved. This work is devoted to the description of this effect and its impact to the polarization of the magnetic moment.We study the processes of optical pumping of alkali metal atoms in the gas cell with buffer gas for the quantum magnetometers. The value of pumped magnetic moment is strongly influenced by the collision effects. Collisions of alkali atoms with the buffer gas lead to partial destruction of the atomic quantum state. As a first approximation, we can assume that the state of electronic shell collapses, but the state of the nucleus is saved. This work is devoted to the description of this effect and its impact to the polarization of the magnetic moment.

International Conference Laser Optics (ICLO)Jun 20, 20220 citations

Fluid and Thermal Dynamical Analysis of Three-Dimensional Spin-Exchange Optical Pumping Cells

Geoff Schrank

We present a finite-element analysis of the fluid dynamics, thermal dynamics, and alkali diffusion in a common cell geometry used for spin-exchange optical pumping of $^{129}$ Xe using a flow-through polarizer design. The analysis is the first to simulate aspects of the laser run-away effect observed in some optical pumping cells. The analysis further suggests that high-temperature gas in the outlet tube may give rise to rapid depolarization due to high concentrations of alkali vapor. Finally, the analysis indicates that the alkali number density distribution and the specifics of the dynamics are highly dependent upon the the distribution of the alkali metal in the optical pumping portion and outlet tube of the cell.We present a finite-element analysis of the fluid dynamics, thermal dynamics, and alkali diffusion in a common cell geometry used for spin-exchange optical pumping of $^{129}$Xe using a flow-through polarizer design. The analysis is the first to simulate aspects of the laser run-away effect observed in some optical pumping cells. The analysis further suggests that high-temperature gas in the outlet tube may give rise to rapid depolarization due to high concentrations of alkali vapor. Finally, the analysis indicates that the alkali number density distribution and the specifics of the dynamics are highly dependent upon the the distribution of the alkali metal in the optical pumping portion and outlet tube of the cell.

arXiv:2005.08404May 18, 20201 citation

We present a finite-element analysis of the fluid dynamics, thermal dynamics, and alkali diffusion in a common cell geometry used for spin-exchange optical pumping of

^{129}

Xe using a flow-through polarizer design. The analysis is the first to simulate aspects of the laser run-away effect observed in some optical pumping cells. The analysis further suggests that high-temperature gas in the outlet tube may give rise to rapid depolarization due to high concentrations of alkali vapor. Finally, the analysis indicates that the alkali number density distribution and the specifics of the dynamics are highly dependent upon the the distribution of the alkali metal in the optical pumping portion and outlet tube of the cell.