Sub-dekahertz spectroscopy of 199Hg+

We report on precision laser spectroscopy of the2S1/2(F = 0) -2D3/2(F = 2, mF= 0) clock transition in a single ion of171Yb+. The absolute value of the transition frequency, determined using an optical frequency comb referenced to a hydrogen maser, is 688 358 979 309 310 plusmn 9 Hz. This corresponds to a fractional uncertainty of 1.3 times 10-14.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Apr 1, 20090 citations

Precision frequency measurement of the 2S1/2 — 2F7/2 electric octupole transition in a single 171Yb+ ion

Stephen A. Webster, Kazumoto Hosaka, Barney Walton +2 more

We report precision laser spectroscopy of the2S1/2(F = 0, mF=0)-2F7/2(F =3, mF= 0) clock transition in a single, trapped, laser cooled ion of171Yb+. The absolute frequency is measured to be 642 121 496 772 656 (12) Hz, a factor of 20 more accurate than previous measurements.

Conference on Precision Electromagnetic MeasurementsJun 1, 20085 citations

Sub-dekahertz spectroscopy of 199Hg+

Jonas Bergquist, Robert J. Rafac, Brent C. Young, James A. Beall, Wayne M. Itano, David J. Wineland

Published Sep 21, 2001• 1 citation

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Abstract

Using a laser that is frequency-locked to a Fabry-Perot etalon of high finesse and stability, we probed the 5d106s 2S1/2(F equals O, mF equals O)

ARLR 5d96s22D5/2 (F equals 2, mF equals O) electric-quadrupole transition of a single laser-cooled 199Hg+ ion stored in a cryogenic radio-frequency ion trap. We observed Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 X 1015 Hz). The functional form and estimated values of some of the frequency shifts of the 2S1/2

ARLR 2D5/2 clock transition (including the quadrupole shift), which have been calculated using a combination of measured atomic parameters and ab initio calculations, are given.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Related papers

Sub-dekahertz spectroscopy of199Hg+

James C. Bergquist, Robert J. Rafac, Brent C. Young +3 more

Using a laser that is frequency-locked to a Fabry-Perot etalon of high finesse and stability, we probed the 5d106s 2S1/2(F equals O, mF equals O) $ARLR 5d96s22D5/2 (F equals 2, mF equals O) electric-quadrupole transition of a single laser-cooled 199Hg+ ion stored in a cryogenic radio-frequency ion trap. We observed Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 X 1015 Hz). The functional form and estimated values of some of the frequency shifts of the 2S1/2 $ARLR 2D5/2 clock transition (including the quadrupole shift), which have been calculated using a combination of measured atomic parameters and ab initio calculations, are given.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.Using a laser that is frequency-locked to a Fabry-Perot etalon of high finesse and stability, we probed the 5d106s 2S1/2(F equals O, mF equals O) $ARLR 5d96s22D5/2 (F equals 2, mF equals O) electric-quadrupole transition of a single laser-cooled 199Hg+ ion stored in a cryogenic radio-frequency ion trap. We observed Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 X 1015 Hz). The functional form and estimated values of some of the frequency shifts of the 2S1/2 $ARLR 2D5/2 clock transition (including the quadrupole shift), which have been calculated using a combination of measured atomic parameters and ab initio calculations, are given.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEMay 3, 20017 citations

Sub-dekahertz Ultraviolet Spectroscopy of 199Hg+

Robert J. Rafac, Brent C. Young, James A. Beall +3 more

Using a laser that is frequency locked to a Fabry-P\'erot \'etalon of high finesse and stability, we probe the ${5d}^{10}6s^{2}S_{1/2}(F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0)\ensuremath{\leftrightarrow}{5d}^{9}{6s}^{2}^{2}D_{5/2}(F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2)$ $\ensuremath{\Delta}{m}_{F}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ electric-quadrupole transition of a single laser-cooled ${}^{199}{\mathrm{Hg}}^{+}$ ion stored in a cryogenic radio-frequency ion trap. We observe Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm ( $1.06\ifmmode\times\else\texttimes\fi{}{10}^{15}\phantom{\rule{0ex}{0ex}}\mathrm{Hz}$), yielding a line $Q\ensuremath{\approx}1.6\ifmmode\times\else\texttimes\fi{}{10}^{14}$. We perform a preliminary measurement of the ${5d}^{9}{6s}^{2}^{2}D_{5/2}$ electric-quadrupole shift due to interaction with the static fields of the trap, and discuss the implications for future trapped-ion optical frequency standards.Using a laser that is frequency locked to a Fabry-P\'erot \'etalon of high finesse and stability, we probe the ${5d}^{10}6s^{2}S_{1/2}(F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0)\ensuremath{\leftrightarrow}{5d}^{9}{6s}^{2}^{2}D_{5/2}(F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2)$ $\ensuremath{\Delta}{m}_{F}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ electric-quadrupole transition of a single laser-cooled ${}^{199}{\mathrm{Hg}}^{+}$ ion stored in a cryogenic radio-frequency ion trap. We observe Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm ( $1.06\ifmmode\times\else\texttimes\fi{}{10}^{15}\phantom{\rule{0ex}{0ex}}\mathrm{Hz}$), yielding a line $Q\ensuremath{\approx}1.6\ifmmode\times\else\texttimes\fi{}{10}^{14}$. We perform a preliminary measurement of the ${5d}^{9}{6s}^{2}^{2}D_{5/2}$ electric-quadrupole shift due to interaction with the static fields of the trap, and discuss the implications for future trapped-ion optical frequency standards.

arXiv:physics/0007002Physical Review LettersSep 18, 2000265 citations

/sup 199/Hg/sup +/ optical frequency standard: progress report

Robert J. Rafac, Brent C. Young, Flávio C. Cruz +4 more

We are developing an optical frequency standard based on the narrow /sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/ electric-quadrupole transition of a single trapped /sup 199/Hg/sup +/ ion. Small linear traps designed to operate at liquid helium temperatures have been constructed which will provide confinement in the Lamb-Dicke regime for the optical transition. Cryogenic operation yields long ion storage times and significantly suppresses frequency shifts due to collisions and blackbody radiation. A major step toward the completion of this standard has been the construction and evaluation of a well isolated, high-finesse, Fabry-Perot cavity to stabilize the frequency of the interrogating laser. We report our cavity results and progress toward locking the laser frequency to the transition in the stored ion.We are developing an optical frequency standard based on the narrow /sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/ electric-quadrupole transition of a single trapped /sup 199/Hg/sup +/ ion. Small linear traps designed to operate at liquid helium temperatures have been constructed which will provide confinement in the Lamb-Dicke regime for the optical transition. Cryogenic operation yields long ion storage times and significantly suppresses frequency shifts due to collisions and blackbody radiation. A major step toward the completion of this standard has been the construction and evaluation of a well isolated, high-finesse, Fabry-Perot cavity to stabilize the frequency of the interrogating laser. We report our cavity results and progress toward locking the laser frequency to the transition in the stored ion.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Jan 22, 20032 citations

High-resolution spectroscopy of the88Sr+single ion optical frequency standard

P. Dubé, Alan A. Madej, J. E. Bernard +1 more

The present decade has seen great advances in optical frequency standards following the development of femtosecond laser frequency combs. With this technology, combined with a stable and narrow probe laser source (50-100 Hz linewidth), we made a systematic study of the 5s 2S1/2-4d 2D5/2 (S-D) transition frequency of the 88Sr+ ion as a function of the quantization axis in the trap. This study revealed the presence of systematic shifts caused by residual micromotion in our rf Paul trap and led to an evaluation of those shifts. Also, a method was developed based on the measurement of the Zeeman spectrum of the clock transition to cancel the electric quadrupole shift caused by patch potentials on the trap electrodes. From these results, we also determined the absolute frequency of the S-D clock transition frequency at 674 nm with a fractional frequency uncertainty of 3.4 × 10-14. We have since made improvements to our probe laser system and have observed 5 Hz Fourier transform limited linewidths on a Zeeman component of the S-D transition of the 88Sr+ ion. To observe such a narrow transition it is essential to have a known and well behaved drift of the laser frequency during the few minutes it takes to measure the ion resonance using the quantum jump signal. Our approach to minimize the drift rate and its sensitivity to temperature fluctuations has been to stabilize the cavity at the temperature where its coefficient of thermal expansion is zero. We will present an overview of our recent progress made on the frequency standard based on the laser-cooled and trapped single ion of 88Sr+.The present decade has seen great advances in optical frequency standards following the development of femtosecond laser frequency combs. With this technology, combined with a stable and narrow probe laser source (50-100 Hz linewidth), we made a systematic study of the 5s 2S1/2-4d 2D5/2 (S-D) transition frequency of the 88Sr+ ion as a function of the quantization axis in the trap. This study revealed the presence of systematic shifts caused by residual micromotion in our rf Paul trap and led to an evaluation of those shifts. Also, a method was developed based on the measurement of the Zeeman spectrum of the clock transition to cancel the electric quadrupole shift caused by patch potentials on the trap electrodes. From these results, we also determined the absolute frequency of the S-D clock transition frequency at 674 nm with a fractional frequency uncertainty of 3.4 × 10-14. We have since made improvements to our probe laser system and have observed 5 Hz Fourier transform limited linewidths on a Zeeman component of the S-D transition of the 88Sr+ ion. To observe such a narrow transition it is essential to have a known and well behaved drift of the laser frequency during the few minutes it takes to measure the ion resonance using the quantum jump signal. Our approach to minimize the drift rate and its sensitivity to temperature fluctuations has been to stabilize the cavity at the temperature where its coefficient of thermal expansion is zero. We will present an overview of our recent progress made on the frequency standard based on the laser-cooled and trapped single ion of 88Sr+.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEAug 29, 20078 citations

Frequency measurement of the 2S1/2 – 2D3/2 electric quadrupole transition in a single 171Yb+ ion

Stephen A. Webster, R. M. Godun, S. A. King +6 more

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Apr 1, 20090 citations

Precision frequency measurement of the 2S1/2 — 2F7/2 electric octupole transition in a single 171Yb+ ion

Stephen A. Webster, Kazumoto Hosaka, Barney Walton +2 more

Conference on Precision Electromagnetic MeasurementsJun 1, 20085 citations

Using a laser that is frequency-locked to a Fabry-Perot etalon of high finesse and stability, we probed the 5d106s 2S1/2(F equals O, mF equals O)

ARLR 5d96s22D5/2 (F equals 2, mF equals O) electric-quadrupole transition of a single laser-cooled 199Hg+ ion stored in a cryogenic radio-frequency ion trap. We observed Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 X 1015 Hz). The functional form and estimated values of some of the frequency shifts of the 2S1/2

{}^{199}{\mathrm{Hg}}^{+}

ion stored in a cryogenic radio-frequency ion trap. We observe Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm ( $1.06\ifmmode\times\else\texttimes\fi{}{10}^{15}\phantom{\rule{0ex}{0ex}}\mathrm{Hz}$), yielding a line $Q\ensuremath{\approx}1.6\ifmmode\times\else\texttimes\fi{}{10}^{14}$. We perform a preliminary measurement of the ${5d}^{9}{6s}^{2}^{2}D_{5/2}$ electric-quadrupole shift due to interaction with the static fields of the trap, and discuss the implications for future trapped-ion optical frequency standards.