Zeitschrift für Naturforschung A

Optisches Pumpen an Mangan

A. Assfalg, Jochen Fricke, J. Haas, R. Tilgner, E. Lüscher

Published Oct 1, 1971• 0 citations

Abstract

Abstract The 6 S5/2 ground state of Mn 55 was polarized by spin exchange collisions with an optically pumped Cs-vapour. The rf induced transitions between Zeeman subleves of Mn were detected as a change in the Cs pumping light transmission. To estimate the effectiveness of direct optical pumping or of detection with resonance light the absorption probabilities for circlarly polarized light are given as functions of 〈Sz〉.

DOI: 10.1515/zna-1971-1003

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Zeitschrift für Naturforschung A

Optisches Pumpen an Mangan

A. Assfalg, Jochen Fricke, J. Haas, R. Tilgner, E. Lüscher

Published Oct 1, 1971• 0 citations

Publisher

Abstract

DOI: 10.1515/zna-1971-1003

Related papers

Effect of Spin-Exchange Collisions on the Optical Orientation of Atomic Sodium

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The effect of spin-exchange collisions on the state populations obtained in an optically pumped ${\mathrm{Na}}^{23}$ vapor is studied in the limit of low light intensity. These state populations and hence the intensity of the rf Zeeman transitions are found theoretically to depend strongly on the spin-exchange cross sections. The various Zeeman rf transitions are found experimentally to be very different in intensity and this is interpreted as being partially due to spin-exchange collisions. From the intensity of the rf transitions in a magnetic field large enough to separate the six Zeeman components and from the observed relaxation time a spin-exchange cross section for two sodium atoms of $\ensuremath{\pi}{{S}_{0}}^{2}=6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}$ ${\mathrm{cm}}^{2}$ is found.The effect of spin-exchange collisions on the state populations obtained in an optically pumped ${\mathrm{Na}}^{23}$ vapor is studied in the limit of low light intensity. These state populations and hence the intensity of the rf Zeeman transitions are found theoretically to depend strongly on the spin-exchange cross sections. The various Zeeman rf transitions are found experimentally to be very different in intensity and this is interpreted as being partially due to spin-exchange collisions. From the intensity of the rf transitions in a magnetic field large enough to separate the six Zeeman components and from the observed relaxation time a spin-exchange cross section for two sodium atoms of $\ensuremath{\pi}{{S}_{0}}^{2}=6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}$ ${\mathrm{cm}}^{2}$ is found.

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Li-Ping Fu, J. L. Luo, Xizhi Zeng

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Chinese Physics LettersMar 1, 20000 citations

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Journal of the Optical Society of AmericaJun 1, 1957223 citations

The effect of spin-exchange collisions on the state populations obtained in an optically pumped

{\mathrm{Na}}^{23}

vapor is studied in the limit of low light intensity. These state populations and hence the intensity of the rf Zeeman transitions are found theoretically to depend strongly on the spin-exchange cross sections. The various Zeeman rf transitions are found experimentally to be very different in intensity and this is interpreted as being partially due to spin-exchange collisions. From the intensity of the rf transitions in a magnetic field large enough to separate the six Zeeman components and from the observed relaxation time a spin-exchange cross section for two sodium atoms of $\ensuremath{\pi}{{S}_{0}}^{2}=6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}14}$

{\mathrm{cm}}^{2}

is found.

We have performed quantitative measurements of the variation of the on-resonance absorption coefficients ${\ensuremath{\kappa}}_{0}$ of the four hyperfine components of the Cs

{D}_{1}

transition as a function of laser power

P

, for pumping with linearly and with circularly polarized light. Sublevel populations derived from rate equations assuming isotropic population relaxation (at a rate ${\ensuremath{\gamma}}_{1}$) yield algebraic ${\ensuremath{\kappa}}_{0}(P)$ dependences that do not reproduce the experimental findings from Cs vapor in a paraffin-coated cell. However, numerical results that consider spin-exchange relaxation (at a rate ${\ensuremath{\gamma}}_{\mathrm{se}}$) and isotropic relaxation fit the experimental data perfectly well. The fit parameters, viz., the absolute value of ${\ensuremath{\kappa}}_{0}$, the optical pumping saturation power

{P}_{\mathrm{sat}}

, and the ratio ${\ensuremath{\gamma}}_{\mathrm{se}}/{\ensuremath{\gamma}}_{1}$, are well described by the experimental conditions and yield absolute values for ${\ensuremath{\gamma}}_{1}$ and ${\ensuremath{\gamma}}_{\mathrm{se}}$. The latter is consistent with the previously published Cs-Cs spin-exchange relaxation cross section.