Rare earth crystal field spectra as a probe of librational motions in BaY2F8 solid state laser crystals

R. Capelletti*, A. Baraldi, E. Buffagni, N. Magnani, M. Mazzera

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The fine structure (FS) accompanying a few lines, originated by crystal field (CF) transitions of rare earths (RE), as Er3+ and Tm 3+, in BaY2F8 single crystals, is analyzed as a function of the RE3+ concentration (0.520 at%) and temperature (9-300 K), by using high resolution (as fine as 0.02 cm-1) Fourier transform spectroscopy and linear dichroism measurements. The 9 K absorption spectra show that FS includes weak, narrow, and closely spaced (0.40.8 cm -1) lines, covering a few cm-1 range on both sides of the narrowest among the CF lines. The FS increases by increasing the RE3+ concentration and vanishes at rather low temperature (40 and 60 K for Er 3+ and Tm3+, respectively). The polarized light spectra confirm the association of a given set of FS lines to a specific CF line. The FS is ascribed to the simultaneous excitation of an electronic CF transition and of a local librational (or hindered rotation) mode of the RE3+-F - group. The attribution is supported 1) by specific features of the host matrix and guest rare earths, which allow some mobility of F- ions, and 2) by the spacing of the FS lines, which is in excellent agreement with the calculated RE3+-F- group rotational constant.

Original languageEnglish
Article number012017
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2010

ASJC Scopus subject areas

  • General Physics and Astronomy


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