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Journal of Physics B Atomic and Molecular Physics

Study of excitation transfers by dye laser pumping

Raymond J. Vetter, Roland M. Damaschini, J. Cahen, Jean Brochard

Published Aug 21, 1975• 6 citations
Publisher

Abstract

A CW dye laser at lambda =5570 gamma has been used to depopulate the first metastable level of krypton in order to study excitation transfers between krypton and xenon levels. The separation between the direct effect of transfers and indirect effects of pumping has been made possible by the analysis of line profiles.
DOI
10.1088/0022-3700/8/12/004

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Saturated-absorption profiles of the lines at lambda =557 nm involving the lowest metastable level of krypton show intense and broad Gaussian backgrounds due to thermalising collisions. These backgrounds are greatly reduced by the addition of xenon atoms which quench the metastable level. The variation of the amplitude of the background relative to the amplitude of the narrow absorption resonance versus pressure is quadratic in pure krypton and linear in mixtures of krypton and xenon. An interpretation of the results is given taking into account transit-time effects, while making use of published results for the quenching cross section.
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Energy-pooling collisions between low-lying excited states of Ba have been studied. We have used a CW dye laser to excite the level in Ba. Radiative decay and collisions with Ba or buffer-gas atoms (Ar, He) populate also the , and metastable levels. The spatial density distributions of these excited levels were measured by the absorption of lines from a Ba hollow-cathode lamp as a function of laser frequency. When the laser was on the exact atomic resonance we observed fluorescence from the , , , , , , and states populated by energy-pooling collisions of Ba( , ). By changing the buffer gas pressure the fluorescence intensity ratio between - and - transitions changes dramatically. This is found to be due to redistribution of population among metastable levels, both in magnitude and space. In addition, we have found that the and metastable levels are also populated when the laser is tuned to the blue from the 553.5 nm line under which conditions a pronounced red-shifted light cone (cone emission) is observed.
We report on the results of optical-pumping experiments in GaP doped with the isoelectronic impurity nitrogen. In the first experiment we have measured the saturation of absorption at the AAA bound exciton as a function of pump intensity, using as the pump a pulsed dye laser tuned to the AAA line. The observed saturation behavior is in quantitative accord with a simple three-level system involving the AAA and BBB bound-exciton level and the N ground state. The second experiment involves measuring the absorption at the AAA line with a weak probe (a tunable dye laser) while the crystal is being pumped with an intense pump dye laser tuned above the indirect gap. In this case also the absorption saturates with increasing pump power and we can infer approximately 10% efficiency for the capture of excitons at N impurities. In this second experiment, a simple model predicts an amplification by a factor of 8.5 but none is observed. We conclude from these measurements that, when pumped above the indirect gap, the dominant excited state of N impurities in our crystal is a single electron trapped at N. We believe that this is caused by the presence of other impurities in the crystal and is not an intrinsic limitation of the system.