Bulletin of the American Physical Society

Efficient detection of $2^3S_1 m=0$ states of atomic helium for improved precision measurements of helium $2^3P$ fine structure

Kosuke Kato, Hermina C. Beica, Ewan Davidson, D. W. Fitzakerley, M. C. George, C. H. Storry, Amar C. Vutha, M. Weel, Eric A. Hessels

Published Jun 7, 2012• 0 citations

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Bulletin of the American Physical Society

Efficient detection of $2^3S_1 m=0$ states of atomic helium for improved precision measurements of helium $2^3P$ fine structureEfficient detection of $2^3S_1 m=0$ states of atomic helium for improved precision measurements of helium $2^3P$ fine structure

Kosuke Kato, Hermina C. Beica, Ewan Davidson, D. W. Fitzakerley, M. C. George, C. H. Storry, Amar C. Vutha, M. Weel, Eric A. Hessels

Published Jun 7, 2012• 0 citations

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Precision Measurements of the J=0 to J=2 Fine-Structure Interval in the Triplet 2P State of Helium-4

Marc Smiciklas, David Charles Shiner

Bulletin of the American Physical SocietyMay 29, 20100 citations

Speed-adjustable atomic beam of metastable helium for precision measurement

J.-J. Chen, Yu Sun, Jin-Lu Wen +1 more

A bright beam of metastable helium atoms is useful in various studies. Laser spectroscopy of helium in an atomic beam can provide a determination of the fine-structure constant and the nuclear charge radius, towards a test of quantum electrodynamics (QED). In these measurements, it is necessary to control not only the internal quantum state but also the translation motion of the helium atom. Here we present a setup producing an intense and speed-adjustable continuous beam of helium atoms. By using a combination of laser cooling, focusing, and deflection, helium atoms are prepared at the single quantum state of ${2}^{\phantom{\rule{0.16em}{0ex}}3}{S}_{1}$ ( $m=0$ ), with a very narrow distribution of the longitudinal speed ($\ensuremath{\delta}{v}_{z}<\ifmmode\pm\else\textpm\fi{}4.5$ m/s). At the same time, we obtain a flux of $1.8\ifmmode\times\else\texttimes\fi{}{10}^{13}$ (atoms/s)/sr with a fractional fluctuation below 0.02%. The atomic-beam quality was investigated by laser spectroscopy, indicating a considerable improvement over those used in previous helium precision-spectroscopy measurements.A bright beam of metastable helium atoms is useful in various studies. Laser spectroscopy of helium in an atomic beam can provide a determination of the fine-structure constant and the nuclear charge radius, towards a test of quantum electrodynamics (QED). In these measurements, it is necessary to control not only the internal quantum state but also the translation motion of the helium atom. Here we present a setup producing an intense and speed-adjustable continuous beam of helium atoms. By using a combination of laser cooling, focusing, and deflection, helium atoms are prepared at the single quantum state of ${2}^{\phantom{\rule{0.16em}{0ex}}3}{S}_{1}$ ($m=0$), with a very narrow distribution of the longitudinal speed ($\ensuremath{\delta}{v}_{z}<\ifmmode\pm\else\textpm\fi{}4.5$ m/s). At the same time, we obtain a flux of $1.8\ifmmode\times\else\texttimes\fi{}{10}^{13}$ (atoms/s)/sr with a fractional fluctuation below 0.02%. The atomic-beam quality was investigated by laser spectroscopy, indicating a considerable improvement over those used in previous helium precision-spectroscopy measurements.

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Abstract We report on interference studies in the internal and external degrees of freedom of metastable triplet helium atoms trapped near quantum degeneracy in a $$ 1.5\kern0.166667em \upmu \mathrm{m} $$ 1.5 μ m optical dipole trap. Applying a single $\pi /2$ π / 2 rf pulse we demonstrate that 50% of the atoms initially in the $m=+1$ m = + 1 state can be transferred to the magnetic field insensitive $m=0$ m = 0 state. Two $\pi /2$ π / 2 pulses with varying time delay allow a Ramsey-type measurement of the Zeeman shift for a high precision measurement of the ${2}^3{S}_1$ 2 3 S 1 – ${2}^1{S}_0$ 2 1 S 0 transition frequency. We show that this method also allows strong suppression of mean-field effects on the measurement of the Zeeman shift, which is necessary to reach the accuracy goal of 0.1 kHz on the absolute transition frequencies. Theoretically the feasibility of using metastable triplet helium atoms in the $m=0$ m = 0 state for atom interferometry is studied demonstrating favorable conditions, compared to the alkali atoms that are used traditionally, for a non-QED determination of the fine structure constant.Abstract We report on interference studies in the internal and external degrees of freedom of metastable triplet helium atoms trapped near quantum degeneracy in a $$ 1.5\kern0.166667em \upmu \mathrm{m} $$ 1.5 μ m optical dipole trap. Applying a single $$ \pi /2 $$ π / 2 rf pulse we demonstrate that 50% of the atoms initially in the $$ m=+1 $$ m = + 1 state can be transferred to the magnetic field insensitive $$ m=0 $$ m = 0 state. Two $$ \pi /2 $$ π / 2 pulses with varying time delay allow a Ramsey-type measurement of the Zeeman shift for a high precision measurement of the $$ {2}^3{S}_1 $$ 2 3 S 1 – $$ {2}^1{S}_0 $$ 2 1 S 0 transition frequency. We show that this method also allows strong suppression of mean-field effects on the measurement of the Zeeman shift, which is necessary to reach the accuracy goal of 0.1 kHz on the absolute transition frequencies. Theoretically the feasibility of using metastable triplet helium atoms in the $$ m=0 $$ m = 0 state for atom interferometry is studied demonstrating favorable conditions, compared to the alkali atoms that are used traditionally, for a non-QED determination of the fine structure constant.

Springer eBooksJan 1, 20182 citations

Measurement of the Fine and Hyperfine Structure in the triplet 2S-2P transition of Helium-3.

Marc Smiciklas, David Charles Shiner

APSMay 1, 20020 citations

Efficient detection of

2^3S_1 m=0

states of atomic helium for improved precision measurements of helium

2^3P

fine structure

{2}^{\phantom{\rule{0.16em}{0ex}}3}{S}_{1}

(

m=0

), with a very narrow distribution of the longitudinal speed ($\ensuremath{\delta}{v}_{z}<\ifmmode\pm\else\textpm\fi{}4.5$ m/s). At the same time, we obtain a flux of $1.8\ifmmode\times\else\texttimes\fi{}{10}^{13}$ (atoms/s)/sr with a fractional fluctuation below 0.02%. The atomic-beam quality was investigated by laser spectroscopy, indicating a considerable improvement over those used in previous helium precision-spectroscopy measurements.

\pi /2

rf pulse we demonstrate that 50% of the atoms initially in the

m=+1

state can be transferred to the magnetic field insensitive

m=0

state. Two

\pi /2

pulses with varying time delay allow a Ramsey-type measurement of the Zeeman shift for a high precision measurement of the

2\,^3S_1

–

2\,^1S_0

transition frequency. We show that this method also allows strong suppression of mean-field effects on the measurement of the Zeeman shift, which is necessary to reach the accuracy goal of 0.1 kHz on the absolute transition frequencies. Theoretically the feasibility of using metastable triplet helium atoms in the

m=0

state for atom interferometry is studied demonstrating favorable conditions, compared to the alkali atoms that are used traditionally, for a non-QED determination of the fine structure constant.

\pi /2

π / 2 rf pulse we demonstrate that 50% of the atoms initially in the

m=+1

m = + 1 state can be transferred to the magnetic field insensitive

m=0

m = 0 state. Two

\pi /2

π / 2 pulses with varying time delay allow a Ramsey-type measurement of the Zeeman shift for a high precision measurement of the

{2}^3{S}_1

2 3 S 1 –

{2}^1{S}_0

2 1 S 0 transition frequency. We show that this method also allows strong suppression of mean-field effects on the measurement of the Zeeman shift, which is necessary to reach the accuracy goal of 0.1 kHz on the absolute transition frequencies. Theoretically the feasibility of using metastable triplet helium atoms in the

m=0

m = 0 state for atom interferometry is studied demonstrating favorable conditions, compared to the alkali atoms that are used traditionally, for a non-QED determination of the fine structure constant.