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Proceedings Paper

Pressure effects in the electronic levels of tunable laser materials
Author(s): V. Lemos
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Paper Abstract

The low to high-field transition in KZnF3:Cr3+, induced by external pressure was observed through photoluminescence measurements at room temperature, T equals 90 K and T equals 20 K. Direct measurement of the lowest electronic level separation (Delta) , was accomplished through the low temperature experiments. Pressure coefficients of (Delta) are given. Emission spectra of KZnF3:Cr3+ obtained at several pressures and temperatures in the range [20 K - 90 K] allow for the construction of a Tanabe-Sugano type diagram illustrating the transition from low- to high-crystal-field regime for cubic and distorted centers. Assignments of sharp lines are given based on the analysis of these diagrams, time-resolved spectroscopy and transition lifetime. Emission measurements were performed at atmospheric pressure and low temperature outside the pressure cell and also at several pressures for KZnF3:Co3+. Comparing the zero-phonon line positions and using the phonon dispersion relation of the host material and fine structure in the emission spectrum of KZnF3:Co2+ was identified. Pressure coefficients were obtained for several among the emission lines from which the values for zero-phonon lines were deduced. Analysis show that the spin-orbit parameter changes with pressure are negligible in KZnF3:Co2+.

Paper Details

Date Published: 6 July 1999
PDF: 12 pages
Proc. SPIE 3572, 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications, (6 July 1999); doi: 10.1117/12.358433
Show Author Affiliations
V. Lemos, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 3572:
3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications
Angela Maria Guzman, Editor(s)

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