Resonance laser spectroscopy of ion pairs in a Nd3+: LaF3 crystal

Ахмеджанов Р.А., Бондарцев А.А., Гущин Л.А., Чернов В.В. Резонансная лазерная спектроскопия ионных пар в кристалле Nd3+:LaF3 // Оптический журнал. 2011. Т. 78. № 5. С. 84–87.

Akhmedzhanov R.A., Bondartsev A.A., Gushchin L.A., Chernov V.V. Resonance laser spectroscopy of ion pairs in a Nd3+: LaF3 crystal [in Russian] // Opticheskii Zhurnal. 2011. V. 78. № 5. P. 84–87.

R. A. Akhmedzhanov, A. A. Bondartsev, L. A. Gushchin, and V. V. Chernov, "Resonance laser spectroscopy of ion pairs in a Nd3+: LaF3 crystal," Journal of Optical Technology. 78(5), 346-348 (2011). https://doi.org/10.1364/JOT.78.000346

This paper shows that the satellite lines that appear in the absorption and fluorescence spectra of neodymium ions in a LaF3 crystal at concentrations of about 0.5 at.% and the accompanying lines of the isolated ion are caused by pairwise interaction of the Nd3+ ions. Double optical resonance is used to study the structure of the satellite lines in the neighborhood of the 4I9/2 → 4G5/2 transition of the isolated ion (wavelength 5777.1 Å), hidden by inhomogeneous broadening. When neodymium ion pairs are excited by resonance laser radiation, the presence of anti-Stokes components is recorded in the fluorescence spectrum (up-conversion). It is shown that the main up-conversion mechanism is cumulative pair excitation. These results are convincing evidence that the suppression of absorption from excited levels can be experimentally observed in condensed media.