Crystal growth and spectroscopic characterization of Yb-doped and Yb, Na-codoped CaF2 laser crystals by TGT

Influence of Various Impurities on the Optical Properties of YbF3-Doped CaF2Crystals

“…These bands are consistent with other reported experiments and calculations [1,3,4,[6][7][8][9]12]. The UV region absorptions can be related to the 4f 14 −4f 13 5d transitions of the Yb 2+ ions [1,3,6,12].…”

“…The other peaks, called Y 1 , Y 2 , and Y 3 bands, are also observed by several investigators, but there are some discrepancies between their spectra [1][2][3][4]. The sharp Y 1 = 922 nm band has not been reported by [4] but has been observed by [3,9,11]. The intensity of the Y 2 = 946 nm increases as the concentration increases.…”

“…The properties of Yb 2+ ions have been less investigated, mainly only for its intense and broad yellow-green (535-560 nm) luminescence [6][7][8]. The influence of monovalent ions (such as Li + and Na + ) on * corresponding author; e-mail: marius stef2002@yahoo.com the absorption and emission spectra of the YbF 3 doped CaF 2 crystals has been less investigated, mainly on the properties of the Yb 3+ ions [9]. The goal of this work is to investigate the influence of Li + and Na + ions on absorption and emission spectra of the divalent ytterbium ions in the as-grown YbF 3 -doped CaF 2 crystals.…”

Concentration distribution of Yb2+ and Yb3+ ions in YbF3:CaF2 crystals

“…For example, the segregation coefficient of Yb 3+ ions in GdVO 4 increases from 0.66 to 0.75 as the Yb 3+ concentration in the melt increases from 2 to 10 at% [9]; k ¼ 0.41 for 1.24 at% YbF 3 -doped Ca 2 La 2/3 (VO 4 ) 2 [10]. The segregation coefficient is greater than unity, for example, in the following crystals, k ¼ 1.1 for 5 at% Yb 2 O 3 :YAG [11], k ¼ 1.14 for 5.7 at% Yb-doped GGG crystal [12], k ¼ 1.07 for 1.96 at% YbF 3 :CaF 2 and k ¼ 0.91 for Yb, NaCaF 2 crystals [13]. The segregation coefficient of the Yb 2+ ion has not been reported.…”

Segregation coefficient of Yb3+ and Yb2+ ions in YbF3 doped BaF2 crystals

“…The homogeneous distribution of the dopant in laser crystals is important because this affects the efficiency of the laser. It has been found that the segregation coefficient of Yb 3+ ions can be k<1 or k>1 depending on the matrix and the dopant concentration [1][2][3] The segregation coefficient of the Yb 2+ and Yb 3+ ions in BaF 2 matrix has not been reported. The goal of this work is to determine the segregation coefficient of the two kinds of Yb ions, namely Yb 2+ and Yb 3+ ions, in as-grown YbF 3 -doped BaF 2 crystals using the optical absorption method.…”