The first and primary objective of spectroscopic investigations on activated laser crystals is to analyze the Stark structure of the spectra and to establish the scheme of energy levels of the activator ion. The second stage of investigation is associated with determining the point symmetry group of the activator, symmetry properties of the wave functions of the Stark levels, and selection rules for the optical transitions and their intensities. Purposeful synthesis and search for new materials with given spectral parameters requires, first of all, theoretical interpretation of dependences between the composition and the structural peculiarities of the base matrix, on the one hand, and the energy spectrum of the activator, on the other. The first problem is solved experimentally using the conventional methods of absorption and luminescence spectroscopy at low temperatures (see, for instance, [43, 46, 47, 61, 63, 497, 549, 722]) which have recently been facilitated by Raman light-scattering methods [501, 557] and stimulated-emission spectroscopy [4, 5, 271]; the latter provides accurate measurements at relatively high temperatures. Information on symmetry properties of the Stark levels and the structure of the activator-ion surroundings is largely obtained from polarization measurements and optical spectra in external fields (Zeeman effect, piezospectroscopy) as well as from EPR results [181,500,604,663]. In recent years the newest spectroscopic methods have been successfully applied to different types of lasers [62,722].
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© 1990 Springer-Verlag Berlin Heidelberg
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Kaminskii, A.A. (1990). Stark Level Structure and Optical Transition Intensities of Activator Ions in Laser Crystals. In: Laser Crystals. Springer Series in Optical Sciences, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-70749-3_4
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DOI: https://doi.org/10.1007/978-3-540-70749-3_4
Publisher Name: Springer, Berlin, Heidelberg
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