Pressure effects in the electronic levels of tunable laser materials

V. Lemos

doi:10.1117/12.358433

6 July 1999 Pressure effects in the electronic levels of tunable laser materials

V. Lemos

Proceedings Volume 3572, 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications; (1999) https://doi.org/10.1117/12.358433
Event: 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications, 1998, Cartagena de Indias, Colombia

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⁺.

Citation Download Citation

V. Lemos "Pressure effects in the electronic levels of tunable laser materials", Proc. SPIE 3572, 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications, (6 July 1999); https://doi.org/10.1117/12.358433

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KEYWORDS

Crystals

Phonons

Temperature metrology

Ions

Tunable lasers

Luminescence

Absorption

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