Two independently tunable, linearly polarized dye lasers are counterpropagated through a heat pipe containing sodium vapor. The frequency of the first laser ${\ensuremath{\omega}}_{1}$ is incremented through both 3 ${p}^{2}$ ${P}_{1/2}$ ,3/2 fine-structure levels while the second laser ${\ensuremath{\omega}}_{2}$ is scanned through the energy increment necessary to reach ns $^{2}S_{1/2}$ and ${\mathrm{nd}}^{2}$ ${D}_{3/2}$ ,5/2 levels (n=5--35). Following excitation, ionization occurs through chemi-ionizing collisions. The polarization (defined as the ionization intensity measured when the two planes of polarization of the laser beams are parallel minus the intensity when perpendicular divided by the sum of the intensities) P=( ${I}_{?}$ -${I}_{\ensuremath{\perp}}$)/( ${I}_{?}$ +${I}_{\ensuremath{\perp}}$) goes from +1 to -1 as ${\ensuremath{\omega}}_{1}$ is tuned between the 3 ${p}^{2}$ ${P}_{1/2}$ ,3/2 fine-structure levels. This novel polarization effect is shown to be due to an interference between the two pathways to the ns $^{2}S_{1/2}$ levels. Upon exciting the unresolved nd $^{2}D_{3/2}$ ,5/2 levels, the polarization is very close to zero when ${\ensuremath{\omega}}_{1}$ is at or near the 3p $^{2}P_{3/2}$ ,1/2 levels. A simple few-level atom theory reproduces the experimental observations except for the case when both lasers are in resonance.Two independently tunable, linearly polarized dye lasers are counterpropagated through a heat pipe containing sodium vapor. The frequency of the first laser ${\ensuremath{\omega}}_{1}$ is incremented through both 3${p}^{2}$${P}_{1/2}$,3/2 fine-structure levels while the second laser ${\ensuremath{\omega}}_{2}$ is scanned through the energy increment necessary to reach ns $^{2}S_{1/2}$ and ${\mathrm{nd}}^{2}$${D}_{3/2}$,5/2 levels (n=5--35). Following excitation, ionization occurs through chemi-ionizing collisions. The polarization (defined as the ionization intensity measured when the two planes of polarization of the laser beams are parallel minus the intensity when perpendicular divided by the sum of the intensities) P=(${I}_{?}$-${I}_{\ensuremath{\perp}}$)/(${I}_{?}$+${I}_{\ensuremath{\perp}}$) goes from +1 to -1 as ${\ensuremath{\omega}}_{1}$ is tuned between the 3${p}^{2}$${P}_{1/2}$,3/2 fine-structure levels. This novel polarization effect is shown to be due to an interference between the two pathways to the ns $^{2}S_{1/2}$ levels. Upon exciting the unresolved nd $^{2}D_{3/2}$,5/2 levels, the polarization is very close to zero when ${\ensuremath{\omega}}_{1}$ is at or near the 3p $^{2}P_{3/2}$,1/2 levels. A simple few-level atom theory reproduces the experimental observations except for the case when both lasers are in resonance.

Physical Review ANov 1, 198912 citations

27p-D-11 過渡的二次光学過程(量子エレクトロニクス,原子・分子合同セッション)

直樹佐野, 吉隆谷村

年会講演予稿集Mar 27, 19870 citations

ac polarizability and photoionization-cross-section measurements in an optical lattice

Ryan Cardman, Xiaoxuan Han, Jamie MacLennan +2 more

We use double-resonant two-photon laser spectroscopy to measure the dynamic scalar polarizability of the rubidium $5{D}_{3/2}$ level, ${\ensuremath{\alpha}}_{5{D}_{3/2}}^{S}$, at a wavelength of $\ensuremath{\lambda}=1064$ nm. Since $\ensuremath{\lambda}$ is shorter than the photoionization (PI) limit of the Rb $5{D}_{3/2}$ level, this state undergoes significant broadening due to PI. The 1064-nm field is applied in the form of a deep optical lattice ($\ensuremath{\sim}{10}^{5}$ photon recoils) generated by an in-vacuum field-enhancement cavity. In our spectroscopic method, we use known dynamic polarizabilities to eliminate the need to measure the light intensity. Our method yields, in atomic units, ${\ensuremath{\alpha}}_{5{D}_{3/2}}^{S}=\ensuremath{-}524(17)$, in agreement with estimates. Additionally, we extract the $5{D}_{3/2}$ photoionization cross section $\ensuremath{\sigma}$ at 1064 nm from spectral linewidths; we find $\ensuremath{\sigma}=44(1)$ Mb.We use double-resonant two-photon laser spectroscopy to measure the dynamic scalar polarizability of the rubidium $5{D}_{3/2}$ level, ${\ensuremath{\alpha}}_{5{D}_{3/2}}^{S}$, at a wavelength of $\ensuremath{\lambda}=1064$ nm. Since $\ensuremath{\lambda}$ is shorter than the photoionization (PI) limit of the Rb $5{D}_{3/2}$ level, this state undergoes significant broadening due to PI. The 1064-nm field is applied in the form of a deep optical lattice ($\ensuremath{\sim}{10}^{5}$ photon recoils) generated by an in-vacuum field-enhancement cavity. In our spectroscopic method, we use known dynamic polarizabilities to eliminate the need to measure the light intensity. Our method yields, in atomic units, ${\ensuremath{\alpha}}_{5{D}_{3/2}}^{S}=\ensuremath{-}524(17)$, in agreement with estimates. Additionally, we extract the $5{D}_{3/2}$ photoionization cross section $\ensuremath{\sigma}$ at 1064 nm from spectral linewidths; we find $\ensuremath{\sigma}=44(1)$ Mb.

arXiv:2107.02635Physical Review ADec 8, 20216 citations

Na（3P）＋Rb（5P）碰撞能量转移截面

沈异凡, 李万兴

原子与分子物理学报Jan 1, 19950 citations

3p-YA-3 冷却原子を用いた量子光学

隆弘久我

日本物理学会講演概要集. 年会Mar 15, 19960 citations

{p}^{2}

{P}_{1/2}

,3/2 fine-structure levels while the second laser ${\ensuremath{\omega}}_{2}$ is scanned through the energy increment necessary to reach ns

^{2}S_{1/2}

and

{\mathrm{nd}}^{2}

{D}_{3/2}

,5/2 levels (n=5--35). Following excitation, ionization occurs through chemi-ionizing collisions. The polarization (defined as the ionization intensity measured when the two planes of polarization of the laser beams are parallel minus the intensity when perpendicular divided by the sum of the intensities) P=(

{I}_{?}

-${I}_{\ensuremath{\perp}}$)/(

{I}_{?}

+${I}_{\ensuremath{\perp}}$) goes from +1 to -1 as ${\ensuremath{\omega}}_{1}$ is tuned between the 3

{p}^{2}

{P}_{1/2}

,3/2 fine-structure levels. This novel polarization effect is shown to be due to an interference between the two pathways to the ns

^{2}S_{1/2}

levels. Upon exciting the unresolved nd

^{2}D_{3/2}

,5/2 levels, the polarization is very close to zero when ${\ensuremath{\omega}}_{1}$ is at or near the 3p

^{2}P_{3/2}

,1/2 levels. A simple few-level atom theory reproduces the experimental observations except for the case when both lasers are in resonance.

We use double-resonant two-photon laser spectroscopy to measure the dynamic scalar polarizability of the rubidium

5{D}_{3/2}

level, ${\ensuremath{\alpha}}_{5{D}_{3/2}}^{S}$, at a wavelength of $\ensuremath{\lambda}=1064$ nm. Since $\ensuremath{\lambda}$ is shorter than the photoionization (PI) limit of the Rb

5{D}_{3/2}

level, this state undergoes significant broadening due to PI. The 1064-nm field is applied in the form of a deep optical lattice ($\ensuremath{\sim}{10}^{5}$ photon recoils) generated by an in-vacuum field-enhancement cavity. In our spectroscopic method, we use known dynamic polarizabilities to eliminate the need to measure the light intensity. Our method yields, in atomic units, ${\ensuremath{\alpha}}_{5{D}_{3/2}}^{S}=\ensuremath{-}524(17)$, in agreement with estimates. Additionally, we extract the

5{D}_{3/2}

photoionization cross section $\ensuremath{\sigma}$ at 1064 nm from spectral linewidths; we find $\ensuremath{\sigma}=44(1)$ Mb.