We describe the first observation of stimulated emission at 0.75–0.80 µm and at 1.06–1.14 µm in sodium vapor at 580°C and 0.5-Torr buffer argon pressure by single-UV-photon or two-visible-photon pumping. For our pumping source, we used a XeCl excimer laser (EMG 101)–dye laser (FL2002), wavelengths 3375.93-Å (PTP) and 5772.8- Å (Rh6G) for single-photon and two-photon excitation with 0.16- Å linewidth and 10-nm pulse width; heating zone of the heat-pipe 25 cm.

Annual Meeting Optical Society of AmericaJan 1, 19860 citations

Zeitschrift für Physik D Atoms Molecules and Clusters

Resonantly enhanced two-photon excitation of sodium atoms in a heat pipe

J. Zhang, P. Lambropoulos, Dino Zei, R. N. Compton, John A. D. Stockdale

Published Sep 1, 1992• 10 citations

Publisher

DOI: 10.1007/bf01437398

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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.

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{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.