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A spectroscopic study of Y b 3+ ions in Y Al 3 (BO 3 ) 4 laser crystals is presented. Polarized absorption and site selective spectroscopy experiments at low temperature have been used to determine the presence of two different Y b 3+ centres in this host crystal in the concentration range 0.2–9 at.%. The contribution of these centres to the absorption spectra has been found to be dependent on the total Y b 3+ concentration, and the Stark energy level diagrams corresponding to the different Y b 3+ centres have been determined. The importance of electron–phonon coupling in the optical transitions of Y b 3+ ions has been also pointed out.
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Ramı́rez et al. (2003) studied this question.
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