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Soviet Journal of Quantum Electronics

Mechanism of laser action due to 4d3D1,2–5p3P20transitions in a strontium atom

Petr A. Bokhan, Бурлаков Владимир Дмитриевич

Published Mar 31, 1979• 1 citation
Publisher

Abstract

Investigations have been made of the energy and temporal characteristics of the 3066.2 and 3011.1 nm stimulated emission lines of a strontium vapor laser as a function of the discharge conditions. Experimental data are presented which confirm the hypothesis that the mechanism for depopulation of the lower active level of the lines under study is collisional spin-orbit relaxation in the 3Pj0 multiplet. It is concluded that the search for collisional laser action in atoms and ions exhibiting large multiplet splitting is promising.

DOI
10.1070/qe1979v009n03abeh008879

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Investigations have been made of the energy and temporal characteristics of the 3066.2 and 3011.1 nm stimulated emission lines of a strontium vapor laser as a function of the discharge conditions. Experimental data are presented which confirm the hypothesis that the mechanism for depopulation of the lower active level of the lines under study is collisional spin-orbit relaxation in the 3Pj0 multiplet. It is concluded that the search for collisional laser action in atoms and ions exhibiting large multiplet splitting is promising.
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We have observed stimulated emission on the transitions 43S1−33PJ° near 518 nm following pulsed laser excitation of Mg vapor near the 31S0−33P1° resonance at 285 nm. The emission has a divergence similar to the pump laser and closely follows the incident laser in time. The mechanism apparently involves pumping an accidental coincidence 31S0−33P1° and 33PJ°−53DJ, permitting depletion of the lower level of the triplet transition. Photoionization of the Mg vapor creates a large electron density (≲1013 cm−3); electron-impact collisions are presumed to mediate the process, transferring population from the laser-pumped 31P1° level to the triplet manifold.
An experimental investigation was made of the interaction of ruby laser radiation with a vapor of thallium atoms. Several atomic lines in the infrared range were observed and investigated for the first time. These lines were due to multiphoton excitation of the thallium atoms. The dependences of the energies of the infrared emission lines on the intensity of the exciting laser radiation indicated that they appeared because of multiphoton ionization of the atoms. Nonresonant stimulated Raman scattering involving electronic transitions between the 6P1/2 and 6P3/2 levels in the thallium atom was observed and studied. The polarization of the infrared emission lines and of the Raman lines was investigated as a function of the polarization of the exciting laser radiation. The energy efficiency of infrared conversion was ~10−5 %.
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