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Acta Scientiarum Naturalium Universitatis Sunyatseni

Responsibility to Optical Pumping for Binary Mixtures of Rb Isotope

Chaorui Li, Qiang Tang, Xiaowei Liu

Published Nov 25, 2009• 0 citations
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Abstract

Investigation of optical pumping for binary mixtures may provide information on the interaction between atomic systems and open up possibility to control response time.Considered Rb isotope 85 Rb and 87 Rb as binary mixtures,optical pumping response can be observed with using square modulated field at 10Hz and two channels of RF sources for NMR of 85 Rb and 87 Rb respectively.Based on proposed model of three energy levels,unitary system or binary mixtures of 85 Rb and 87 Rb can be accurately described with an exponential function.According to the relation of response time between binary and unitary,the response time for mixtures is contributed from unitary ones and their concentrations.

Related papers

Responsibility to Optical Pumping for Rb Isotope with Magnetic Resonance

Chaorui Li, Xiaowei Liu

Optical pumping makes atom system be partial polarization but magnetic resonance produces depolarization,which is the basic process for investigation of the responsibility to optical pumping for Rb isotope.With improvement on experimental technology,the magnetic resonance signal,also with optical pumping signal,from 85Rb and 87Rb can be completely separated.The relation between detecting signal and physics parameters for optical pumping is drawn out by assuming a model of three energy levels.Results from data analysis indicate the responsibility to optical pumping for 87Rb and 85Rb will be accurately described with unitary relaxation mechanism,respectively.The relaxation time has partly reflected the difference of transition probabilities between energy levels of 87Rb and 85Rb.

Acta Scientiarum Naturalium Universitatis Sunyatseni•Jan 25, 2008•0 citations

High-efficiency laser-pumping system for magnetic resonance imaging

Marziale Milani, Guido Baroni, Lorenzo Ferraro +3 more

Recently the demand for hyperpolarized noble gases is arising to improve NMR spectroscopy resolution for imaging. Hyperpolarization of noble gases is achieved by spin- exchange with alkali metal. atoms that undergo optical pumping by circularly polarized radiation. Optical pumping is usually achieved by high power semiconductor lasers. These sources have a bandwidth very large when compared with the transition bandwidth of the optically active species. This has two serious consequences: (i) the request of high power lasers, (ii) the losses that the unemployed energy delivered to the Rb vapor can provide in the efficiency of the energy transfer. Object of our investigation will be the comparison of two experimental set ups for optical pumping of Rb vapor where pumping is given in one case by a dye laser pumped by a UV nitrogen laser built in our laboratory according to the Blumlein scheme and in the other case by a semiconductor laser. Major elements that will be discussed are (1) the role of stimulated emission of Rb vapor to increase the pumping efficiency, (2) the fate of resonant photons that are emitted during Rb decays, (3) the role of applied magnetic fields in the efficiency of pumping processes.

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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.

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Observation of polarized atoms of rubidium isotopes in experiments on optical orientation in a He–Rb mixture under conditions of a pulsed gas discharge

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J Marek

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High-field measurement of the 129Xe−Rb spin-exchange rate due to binary collisions

Yuan‐Yu Jau, Nicholas N. Kuzma, W. Happer

We have measured the binary spin-exchange rate coefficient for collisions between Rb and ${}^{129}\mathrm{Xe}$ atoms at a magnetic field $B=9.4\mathrm{T}$ and in the temperature range $160<T<200\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}.$ The longitudinal spin-relaxation rate ${1/T}_{1}$ of ${}^{129}\mathrm{Xe}$ is dominated by ${}^{129}\mathrm{Xe}\ensuremath{-}\mathrm{Rb}$ binary collisions. We measured ${1/T}_{1}$ using the methods of conventional nuclear magnetic resonance, with no spin enhancement by optical pumping. At the high magnetic field and large gas pressures used in this work, the contribution of ${}^{129}\mathrm{Xe}\ensuremath{-}\mathrm{Rb}$ molecules to the spin-exchange rate was less than 0.1% of the binary-collision rate. The Rb atomic number density [Rb] was measured directly from the large Faraday rotation of the polarization of near-resonant light passing through the sample cells. The rate coefficient is $\ensuremath{\kappa}{=d(1/T}_{1})/d[\mathrm{Rb}]=(1.75\ifmmode\pm\else\textpm\fi{}0.12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}{\mathrm{cm}}^{3}/\mathrm{s}.$

Physical Review A•Nov 15, 2002•40 citations
Investigation of optical pumping for binary mixtures may provide information on the interaction between atomic systems and open up possibility to control response time.Considered Rb isotope 85 Rb and 87 Rb as binary mixtures,optical pumping response can be observed with using square modulated field at 10Hz and two channels of RF sources for NMR of 85 Rb and 87 Rb respectively.Based on proposed model of three energy levels,unitary system or binary mixtures of 85 Rb and 87 Rb can be accurately described with an exponential function.According to the relation of response time between binary and unitary,the response time for mixtures is contributed from unitary ones and their concentrations.
Optical pumping makes atom system be partial polarization but magnetic resonance produces depolarization,which is the basic process for investigation of the responsibility to optical pumping for Rb isotope.With improvement on experimental technology,the magnetic resonance signal,also with optical pumping signal,from 85Rb and 87Rb can be completely separated.The relation between detecting signal and physics parameters for optical pumping is drawn out by assuming a model of three energy levels.Results from data analysis indicate the responsibility to optical pumping for 87Rb and 85Rb will be accurately described with unitary relaxation mechanism,respectively.The relaxation time has partly reflected the difference of transition probabilities between energy levels of 87Rb and 85Rb.
Recently the demand for hyperpolarized noble gases is arising to improve NMR spectroscopy resolution for imaging. Hyperpolarization of noble gases is achieved by spin- exchange with alkali metal. atoms that undergo optical pumping by circularly polarized radiation. Optical pumping is usually achieved by high power semiconductor lasers. These sources have a bandwidth very large when compared with the transition bandwidth of the optically active species. This has two serious consequences: (i) the request of high power lasers, (ii) the losses that the unemployed energy delivered to the Rb vapor can provide in the efficiency of the energy transfer. Object of our investigation will be the comparison of two experimental set ups for optical pumping of Rb vapor where pumping is given in one case by a dye laser pumped by a UV nitrogen laser built in our laboratory according to the Blumlein scheme and in the other case by a semiconductor laser. Major elements that will be discussed are (1) the role of stimulated emission of Rb vapor to increase the pumping efficiency, (2) the fate of resonant photons that are emitted during Rb decays, (3) the role of applied magnetic fields in the efficiency of pumping processes.
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.
Using laser excitation of the 6 2 P levels in the natural isotopic mixture of Rb atoms, modulation of superradiance intensity from some transitions to the lower levels was observed. On the transition 6 2 P 1/2 -6 2 S 1/2 this effect is interpreted as a quantum beat between the hyperfine-structure transitions of the Rb 85 and Rb 87 isotopes. A nearly 'single-pulse' superradiant signal was obtained on the 6 2 P-4 2 D transitions. When a magnetic field was applied transverse to the direction of the laser beam, the pulses obtained showed the properties forecast by two-level superradiance theory. Preliminary results are reported.
We have measured the binary spin-exchange rate coefficient for collisions between Rb and 129Xe{}^{129}\mathrm{Xe}129Xe atoms at a magnetic field B=9.4TB=9.4\mathrm{T}B=9.4T and in the temperature range $160<T<200\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}.$ The longitudinal spin-relaxation rate 1/T1{1/T}_{1}1/T1​ of 129Xe{}^{129}\mathrm{Xe}129Xe is dominated by ${}^{129}\mathrm{Xe}\ensuremath{-}\mathrm{Rb}$ binary collisions. We measured 1/T1{1/T}_{1}1/T1​ using the methods of conventional nuclear magnetic resonance, with no spin enhancement by optical pumping. At the high magnetic field and large gas pressures used in this work, the contribution of ${}^{129}\mathrm{Xe}\ensuremath{-}\mathrm{Rb}$ molecules to the spin-exchange rate was less than 0.1% of the binary-collision rate. The Rb atomic number density [Rb] was measured directly from the large Faraday rotation of the polarization of near-resonant light passing through the sample cells. The rate coefficient is $\ensuremath{\kappa}{=d(1/T}_{1})/d[\mathrm{Rb}]=(1.75\ifmmode\pm\else\textpm\fi{}0.12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}{\mathrm{cm}}^{3}/\mathrm{s}.$