The line shape of the Raman transition between metastable levels of neon ( $^{3}p_{0}\mathrm{and}^{3}p_{2}$ ) is studied as a function of the pressure of a helium buffer gas. Dicke narrowing of the Doppler-broadened nonresonant Raman signal (for large optical detunings) gives the first evidence of conservation of a fine-structure coherence by velocity-changing collisions. Pressure broadening of the resonant Raman signal gives a measurement of the velocity-changing-collision rate.The line shape of the Raman transition between metastable levels of neon ($^{3}p_{0}\mathrm{and}^{3}p_{2}$) is studied as a function of the pressure of a helium buffer gas. Dicke narrowing of the Doppler-broadened nonresonant Raman signal (for large optical detunings) gives the first evidence of conservation of a fine-structure coherence by velocity-changing collisions. Pressure broadening of the resonant Raman signal gives a measurement of the velocity-changing-collision rate.

Physical Review LettersMay 19, 19866 citations

Stimulated Raman Scattering

A. Laubereau

Springer eBooksJan 1, 198213 citations

Stimulated Raman spectroscopy and the determination of the D -fine-structure level separation in C40a+

Rekishu Yamazaki, Hideyuki Sawamura, Kenji Toyoda +1 more

We describe the results of stimulated Raman spectroscopy between the fine-structure levels, specifically $3{d}^{2}{D}_{3/2}$ and $3{d}^{2}{D}_{5/2}$ metastable states, in a single trapped ${^{40}\text{C}\text{a}}^{+}$ . Transitions between different Zeeman sublevels, split by an applied magnetic field, are clearly observed and the fine-structure level separation of $\ensuremath{\nu}=1\text{ }819\text{ }599\text{ }021\text{ }504\ifmmode\pm\else\textpm\fi{}37\text{ }\text{Hz}$ is determined. This measurement provides a direct observation of this level separation. From the spectroscopic data, a prospect of using the $D$ -fine structure levels as a qubit for the quantum information processing is reviewed.We describe the results of stimulated Raman spectroscopy between the fine-structure levels, specifically $3{d}^{2}{D}_{3/2}$ and $3{d}^{2}{D}_{5/2}$ metastable states, in a single trapped ${^{40}\text{C}\text{a}}^{+}$. Transitions between different Zeeman sublevels, split by an applied magnetic field, are clearly observed and the fine-structure level separation of $\ensuremath{\nu}=1\text{ }819\text{ }599\text{ }021\text{ }504\ifmmode\pm\else\textpm\fi{}37\text{ }\text{Hz}$ is determined. This measurement provides a direct observation of this level separation. From the spectroscopic data, a prospect of using the $D$-fine structure levels as a qubit for the quantum information processing is reviewed.

Physical Review AJan 23, 200815 citations

Dynamics and spatial order of cold cesium atoms in a periodic optical potential

G. Grynberg, Philippe Verkerk, J.-Y. Courtois +3 more

The spatial distribution of cesium atoms in a 1D optical molasses are probed by measuring the absorption (or amplification) of a weak laser beam. Very narrow stimulated Raman and Rayleigh resonances are observed. The position of the Raman resonance gives access to the oscillation frequency of the atoms in the wavelength-scale optical potential. From the width of the Raman lines (~35 kHz), we deduce the damping time of this oscillation, which exhibits a dramatic lengthening due to the spatial confinement of atoms to a fraction of optical wavelength (Lamb–Dicke effect). Furthermore, the narrow stimulated Rayleigh signals (8 kHz) give experimental evidence for a large scale spatial order of the atomic gas presenting some analogy with an antiferromagnetic medium.The spatial distribution of cesium atoms in a 1D optical molasses are probed by measuring the absorption (or amplification) of a weak laser beam. Very narrow stimulated Raman and Rayleigh resonances are observed. The position of the Raman resonance gives access to the oscillation frequency of the atoms in the wavelength-scale optical potential. From the width of the Raman lines (~35 kHz), we deduce the damping time of this oscillation, which exhibits a dramatic lengthening due to the spatial confinement of atoms to a fraction of optical wavelength (Lamb–Dicke effect). Furthermore, the narrow stimulated Rayleigh signals (8 kHz) give experimental evidence for a large scale spatial order of the atomic gas presenting some analogy with an antiferromagnetic medium.

Annual Meeting Optical Society of AmericaJan 1, 19923 citations

The line shape of the Raman transition between metastable levels of neon (

^{3}p_{0}\mathrm{and}^{3}p_{2}

) is studied as a function of the pressure of a helium buffer gas. Dicke narrowing of the Doppler-broadened nonresonant Raman signal (for large optical detunings) gives the first evidence of conservation of a fine-structure coherence by velocity-changing collisions. Pressure broadening of the resonant Raman signal gives a measurement of the velocity-changing-collision rate.

We describe the results of stimulated Raman spectroscopy between the fine-structure levels, specifically

3{d}^{2}{D}_{3/2}

and

3{d}^{2}{D}_{5/2}

metastable states, in a single trapped

{^{40}\text{C}\text{a}}^{+}

. Transitions between different Zeeman sublevels, split by an applied magnetic field, are clearly observed and the fine-structure level separation of $\ensuremath{\nu}=1\text{ }819\text{ }599\text{ }021\text{ }504\ifmmode\pm\else\textpm\fi{}37\text{ }\text{Hz}$ is determined. This measurement provides a direct observation of this level separation. From the spectroscopic data, a prospect of using the

D

-fine structure levels as a qubit for the quantum information processing is reviewed.