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Acta Optica Sinica

Measurement of Gd atom metastable levels by laser induced fluorescence spectroscopy

Lina Hu

Published Jan 1, 1991• 0 citations
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Abstract

The atomic beam velocity distribution of Gd atomic metastable levels, 215cm-1 533 cm-1 and 999 cm-1 were measured by means of laser induced fluorescence method. Their lifetimes are deduced from the change of the velocity distributions at two different probe areas along the beam axis. The experimental results show that this is a very simple, sensitive and effective method to measure the lifetime of atomic metastable level.

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Japanese Journal of Applied Physics•Feb 10, 2004•3 citations
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In this paper,we give a new method to measure the lifetime of 5s5p3P1 metastable state for Sr atom,based on the TOF method and the absorption spectrum technique.During the experiment,we use the 689 nm laser to pump the Sr atoms of ground state(5s2)1S0 to the 5s5p3P1 metastable state,then we obtain the 688 nm laser absorption spectrums by using the 688 nm probing laser.With these spectrums we change different parameters to obtain a good index decaying curve and then we can get the value of τ.The value of our experimental is(21.9±0.8) μs.The method presented here have a low demand of experimental setup and can get a relatively high precision synchronously.
We report the measurement of Rabi oscillations in the optical pumping of a beam of metastable neon atoms in a three-level system with a cw dye laser. The laser beam is focused on the atomic beam, resulting in an interaction time with the laser beam of the order of the spontaneous lifetime of the induced transition. The Rabi oscillations are measured by a velocity-resolved analysis of the optically pumped metastable atoms. Adiabatic following is observed when the atoms cross the laser beam outside the waist, induced by the Doppler shifts due to the curvature of the wave fronts.
A delayed-coincidence technique has been used to measure the lifetime of the 5d6p1F35d6p^{1}F_{3}5d6p1F3​ state of atomic barium. An intermediate, 6s5d1D26s5d^{1}D_{2}6s5d1D2​ metastable state of barium atoms in an atomic beam was populated by electron bombardment, and a pulsed cw laser was employed to excite atoms from the metastable state to the 5d6p1F35d6p^{1}F_{3}5d6p1F3​ state. A time-to-amplitude convertor was used to measure the time distribution of the fluorescent light. The value obtained for the lifetime was (44.5\ifmmode\pm\else\textpm\fi{}1.8) nsec.
The absorption spectra of two transitions originating from 0 and 999 cm -1 for atomic Gd were investigated at 394.554 nm. Newly measured transition probabilities are reported. Because of a narrow spectral difference of approximately 0.195 cm -1 between the two transitions, rapid sweeping of the diode laser wavelength made it possible to record both the absorption spectra simultaneously. The adopted technique enabled the real-time monitoring of the fraction of the Gd vapor at the ground energy level.