Optical spectroscopy of lanthanide ions in ZnO-TeO2 glasses.

Zinc tellurite glasses of compositions 19ZnO-80TeO2-1Ln2O3 with Ln = Eu, Er, Nd and Tm were prepared by melt quenching. The absorption spectra were measured and from the experimental oscillator strengths of the f-->f transitions the Judd-Ofelt parameters ohm(lambda) were obtained. The values of the ohm(lambda) parameters are in the range usually observed for oxide glasses. For Nd3+ and Er3+, luminescence spectra in the near infrared were measured and the stimulated emission cross sections sigma(p) were evaluated for some laser transitions. The high values of sigma(p), especially for Nd3+, make them possible candidates for optical applications. Fluorescence line narrowing (FLN) spectra of the Eu3+ doped glass were measured at 20 K, and the energies of the Stark components of the 7F1 and 7F2 states were obtained. A crystal field analysis was carried out assuming a C2v site symmetry. The behaviour of the crystal field ratios B22/B20 and B44/B40 agrees reasonably well with the values calculated using the geometric model proposed by Brecher and Riseberg. The crystal field strength at the Eu3+ sites appears to be very low compared to other oxide glasses.

[1]  C. Brecher,et al.  Laser-induced fluorescence line narrowing in Eu glass: a spectroscopic analysis of coordination structure , 1976 .

[2]  Shibin Jiang,et al.  Erbium-doped phosphate glass fibre amplifiers with gain per unit length of 2.1 dB/cm , 1999 .

[3]  S. Davey,et al.  Fluorescence line narrowing spectroscopy of europium(III) ions in a fluorozirconate glass 36093 , 1995 .

[4]  A. Speghini,et al.  Fluorescence line narrowing spectroscopy of Eu3+ doped sodium germanate glasses , 2000 .

[5]  M. Casarin,et al.  Optical spectroscopy of trivalent lanthanide ions in strontium metaphosphate glasses , 1998 .

[6]  H. Ebendorff-Heidepriem,et al.  Spectroscopic properties of rare-earth ions in heavy metal oxide and phosphate-containing glasses , 1999, Photonics West.

[7]  Homogeneous line width in a zinc borate glass activated by Eu3 , 1997 .

[8]  A. Lempicki,et al.  The europium ion in octacoordinate crystal fields: Symmetry, potentential, and level splittings , 1968 .

[9]  R. Denning,et al.  Site selective spectroscopy and molecular dynamics simulation of Eu(III) ZBLAN glasses , 1996 .

[10]  B. G. Potter,et al.  Increased Radiative Lifetime of Rare Earth-doped Zinc Oxyhalide Tellurite Glasses , 1997 .

[11]  V. Kozhukharov,et al.  Atomic arrangement of a zinc-tellurite glass , 1986 .

[12]  M. Ferrari,et al.  Spectroscopic investigation of zinc borate glasses doped with trivalent europium ions , 1996 .

[13]  B. G. Potter,et al.  Structure and optical properties of rare earth-doped zinc oxyhalide tellurite glasses , 1997 .

[14]  K. Kneipp,et al.  Glass formation, properties and structure of glasses in the TeO2ZnO system , 1992 .

[15]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[16]  Aiko Narazaki,et al.  Induction and relaxation of optical second-order nonlinearity in tellurite glasses , 1999 .

[17]  William M. Yen,et al.  Laser Spectroscopy of Solids , 1981 .

[18]  Miss A.O. Penney.  (b) , 1974, The New Yale Book of Quotations.

[19]  Renata Reisfeld,et al.  Radiative and non-radiative transitions of rare-earth ions in glasses , 1975 .

[20]  W. H. Lowdermilk,et al.  Multiphonon relaxation of rare-earth ions in oxide glasses , 1977 .

[21]  K. Stevens.  Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions , 1952 .

[22]  S. Turrell,et al.  Raman scattering in tellurium-metal oxyde glasses , 1995 .

[23]  Yaron Silberberg,et al.  1.3 μm emission of neodymium and praseodymium in tellurite-based glasses , 1994 .

[24]  Proulx,et al.  Absorption and emission spectroscopy of Eu3+ in metaphosphate glasses. , 1990, Physical review. B, Condensed matter.

[25]  Shibin Jiang.  Rare-Earth-Doped Materials and Devices IV , 2000 .

[26]  M. Wachtler,et al.  Fluorescence line narrowing spectroscopy of a lead germanate glass doped with Eu3 , 1998 .

[27]  K. Rajnak,et al.  Electronic Energy Levels in the Trivalent Lanthanide Aquo Ions. I. Pr3+, Nd3+, Pm3+, Sm3+, Dy3+, Ho3+, Er3+, and Tm3+ , 1968 .

[28]  Andrew G. Glen,et al.  APPL , 2001 .

[29]  T. Belliveau,et al.  On the coordination environment of rare earth ions in oxide glasses: Calcium titanosilicate and sodium aluminosilicate glasses , 1989 .

[30]  Edwin D. Mares,et al.  On S , 1994, Stud Logica.

[31]  M. Casarin,et al.  Absorption and luminescence spectroscopy of Nd3+ and Er3+ in a zinc borate glass , 1996 .

[32]  S. Rotman.  Wide-Gap Luminescent Materials: Theory and Applications , 1997 .

[33]  V. Nazabal,et al.  Second-Harmonic Generation of Electrically Poled Borophosphate Glasses: Effects of Introducing Niobium or Sodium Oxides , 1997 .