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SM ISO690:2012 LUPEI, Aurelia G., LUPEI, Voicu, PRESURA, C., ENAKI, Viorel, PETRARU, Adrian. Electron-phonon coupling effects on Yb3+ spectra in several laser crystals. In: Journal of Physics Condensed Matter, 1999, vol. 11, pp. 3769-3778. ISSN 0953-8984. DOI: https://doi.org/10.1088/0953-8984/11/18/312 |
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Journal of Physics Condensed Matter | ||||||
Volumul 11 / 1999 / ISSN 0953-8984 /ISSNe 1361-648X | ||||||
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DOI:https://doi.org/10.1088/0953-8984/11/18/312 | ||||||
Pag. 3769-3778 | ||||||
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The complex absorption spectra of Yb3+ in YAG, LiNbO3 and YLF, three important laser crystals, are analysed in terms of electron-phonon coupling effects. The local symmetry for Yb3+ in these crystals is noncentrosymmetric allowing the coexistence of several electron-phonon coupling mechanisms in the formation of vibronic spectra. The shape of several Yb3+ absorption lines is interpreted in terms of the near resonant electron-phonon coupling theory. The computer modelling, by taking into account more phonons in the resonance region enables the assignment of crystal-field levels of the Yb3+ 2F5/2 multiplet and an estimation of electron-phonon coupling strengths. The phonons involved in the near resonance processes were observed in Raman spectra too. For YAG the modelling with a phonon density with four peaks in the near resonant region is made and it gives a good description of the complex experimental pattern. In the case of Yb3+ in LiNbO3 and YLF the use of polarization data evidences also the symmetry characteristics of the electron-phonon coupling. |
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