Optical pumping in rubidium-87 - A mixture of sigma+ and sigma- circularly polarized light on the (Fg=1 - Fe=0) transition in the D2-line

Anders Kastberg, Fred Atoneche

Published Jan 1, 2017• 0 citations

Abstract

We present results of a method for calculating optical pumping rates in Rb-87, as described in Eur. J. Phys 38, 045703 (2017) We use a mixture of circularly polarized light (sigma+ and sigma-) on the (Fg=1 - Fe=0) transition to populate an angular momentum state in the Fg=1 hyperfine structure level of the ground state, with magnetic quantum number Mg=0 - that is a clock state. The method is shown to function well for the studied system. Explicit analytical equations for all level populations as functions of time, detuning, intensity, relative intensities of the polarization, and starting parameters are derived.

DOI: 10.6084/m9.figshare.3750702.v3

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Optical pumping in rubidium-87 - A mixture of sigma+ and sigma- circularly polarized light on the (Fg=1 - Fe=0) transition in the D2-line

Anders Kastberg, Fred Atoneche

Published Jan 1, 2017• 0 citations

Publisher

Abstract

DOI: 10.6084/m9.figshare.3750702.v3

Related papers

Optical pumping in rubidium-87 - Impure polarization (a mixture of sigma+, sigma- and pi light) on the (Fg=2 - Fe=3) transition in the D2 line

Anders Kastberg, Fred Atoneche

We present results of a method for calculating optical pumping rates in Rb-87, as described in Eur. J. Phys 38, 045703 (2017) We use light with an impure polarization (i.e. a mixture of sigma+, sigma- and pi light) to populate a stretched angular momentum state in the Fg=2 hyperfine structure level of the ground state. The method is shown to function well for the studied system. Absolute scale level populations as functions of time, detuning, intensity, relative intensity of polarizations, and starting parameters are derived.We present results of a method for calculating optical pumping rates in Rb-87, as described in Eur. J. Phys 38, 045703 (2017) We use light with an impure polarization (i.e. a mixture of sigma+, sigma- and pi light) to populate a stretched angular momentum state in the Fg=2 hyperfine structure level of the ground state. The method is shown to function well for the studied system. Absolute scale level populations as functions of time, detuning, intensity, relative intensity of polarizations, and starting parameters are derived.

Jan 1, 20170 citations

Optical pumping in rubidium-87 - Circular polarisation on the (Fg=2 - Fe=3) transition in the D2-line in the presence of a magnetic field

Anders Kastberg, Fred Atoneche

We present results of a method for calculating optical pumping rates in Rb-87, as described in Eur. J. Phys 38, 045703 (2017) We use circularly polarized light to populate a stretched angular momentum state in the Fg=2 hyperfine structure level of the ground state. We include in the analysis an applied weak magnetic field. The method is shown to function well for the the studied system. Absolute scale level populations as functions of time, detuning, intensity, magnetic field and starting parameters are derived.We present results of a method for calculating optical pumping rates in Rb-87, as described in Eur. J. Phys 38, 045703 (2017) We use circularly polarized light to populate a stretched angular momentum state in the Fg=2 hyperfine structure level of the ground state. We include in the analysis an applied weak magnetic field. The method is shown to function well for the the studied system. Absolute scale level populations as functions of time, detuning, intensity, magnetic field and starting parameters are derived.

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Optical transition probabilities between the several magnetic sublevels of the ${\mathrm{Rb}}^{85}$ ground state via the first excited state are given separately for the two fine-structure components. Graphs of the populations of the states are presented as a function of the time the atoms are illuminated by circularly polarized resonance radiation.Optical transition probabilities between the several magnetic sublevels of the ${\mathrm{Rb}}^{85}$ ground state via the first excited state are given separately for the two fine-structure components. Graphs of the populations of the states are presented as a function of the time the atoms are illuminated by circularly polarized resonance radiation.

Physical ReviewJun 5, 19698 citations

We have studied the optical pumping of mixtures of Rb vapor and

{\mathrm{N}}_{2}

buffer gas by laser light tuned to the

{D}_{1}

transition having a spectral width of

~500

MHz. The Rb densities are of the order of

{10}^{13}

cm${}^{\ensuremath{-}3}$, while the buffer-gas pressures range from 0.1 to 10 torr. As the frequency of the right-hand circularly polarized laser is varied across the

{D}_{1}

absorption profile, the electron spin polarization of the Rb is found to take on negative values for small negative values of pump detuning from the absorption profile center. This occurs for

{\mathrm{N}}_{2}

pressures below

~1

torr; at 10 torr the electron spins consistently point in the same direction as the angular momentum of the pump light. The spin-reversal effect can be understood in terms of populations of the

F=2

(

^{85}\mathrm{Rb}

) and

F=1

(

^{87}\mathrm{Rb}

) states caused by small unpolarized fractions in the pump beam and its elimination in terms of pressure broadening caused by the

{\mathrm{N}}_{2}

buffer gas. We speculate that this effect could be used for fast Rb spin modulation.

Optical transition probabilities between the several magnetic sublevels of the

{\mathrm{Rb}}^{85}

ground state via the first excited state are given separately for the two fine-structure components. Graphs of the populations of the states are presented as a function of the time the atoms are illuminated by circularly polarized resonance radiation.