Optical properties of holmium-doped β″-alumina

Ho3+-doped β″-aluminas have been prepared over a wide range of concentrations by the ion-exchange method. The absorption, emission and excitation spectra of these materials have been determined in combination with fluorescence lifetime measurements. The absorption spectra were characterized by extremely strong hypersensitive transitions that were relatively independent of polarization while the other transitions exhibited higher oscillator strengths in π polarization. A Judd–Ofelt analysis was performed and various parameters were calculated for the different absorption and emission bands including intensity parameters, spontaneous emission probabilities and branching ratios. The stimulated emission cross-section was calculated for the 2.1 µm band of Ho3+ : β″-alumina at 77 K and was found to be 1 × 10–20 cm2 with a quantum efficiency of 25%. This relatively low value for efficiency is associated with multiphonon relaxation processes in the lattice.

[1]  H. Dai,et al.  Polarized absorption spectrum and intensity analysis of trivalent neodymium in sodium β″ alumina , 1991 .

[2]  B. Dunn,et al.  The Use of Multiple Ion Exchange to Produce Energy Transfer in Beta Aluminas , 1989 .

[3]  W. Sibley,et al.  Optical absorption and emission from Ho3+ ions in KCaF3 crystals , 1988 .

[4]  W. Carrillo‐Cabrera,et al.  The structure of the lanthanide Gd3+, Eu3+ and Nd3+ β″-aluminas , 1988 .

[5]  B. Dunn,et al.  Spectroscopic studies of Nd3+-exchanged β″ alumina , 1988 .

[6]  Siyuan Zhang,et al.  Spectral properties and intensity parameters of Ho3+:Gd3Ga5O12 (Ho:GGG) single crystals , 1988 .

[7]  B. Dunn,et al.  Analysis of the absorption spectrum of neodymium:sodium beta double prime alumina , 1988 .

[8]  Renata Reisfeld,et al.  Laser properties of holmium and erbium in thorium-, zinc- and yttrium-based fluoride glass , 1987 .

[9]  B. Dunn,et al.  Saturated absorption and degenerate four-wave mixing in Nd 3+ beta″ alumina , 1986 .

[10]  B. Dunn,et al.  Nd(3+) beta'' alumina platelet laser. , 1984, Optics letters.

[11]  Bruce Dunn,et al.  Divalent beta″-aluminas: High conductivity solid electrolytes for divalent cations , 1982 .

[12]  R. Reisfeld,et al.  Absorption and emission of Ho3+ in germanate glasses , 1978 .

[13]  J. Heber,et al.  Renata Reisfeld und Christian H. Jørgensen: Lasers and Excited States of Rare Earths, Bd. 1 der Reihe: “Inorganic Chemistry Concepts”. Springer‐Verlag, Berlin, Heidelberg, New York 1977. 226 Seiten, Preis: DM 64,–, $ 29,50. , 1978 .

[14]  F. Auzel,et al.  Étude de deux transferts d'énergie non radiatifs entre ions H 03+ dans le fluorure d'yttrium; possibilités d'applications , 1976 .

[15]  T. E. Varitimos,et al.  Laser action from Ho 3+ , Er 3+ , and Tm 3+ in YAlO 3 , 1973 .

[16]  T. E. Varitimos,et al.  Optical Intensities of Rare-Earth Ions in Yttrium Orthoaluminate , 1973 .

[17]  M. Weber,et al.  Optical Transition Probabilities for Trivalent Holmium in LaF3 and YAlO3 , 1972 .

[18]  B. Judd,et al.  OPTICAL ABSORPTION INTENSITIES OF RARE-EARTH IONS , 1962 .

[19]  G. S. Ofelt.  Intensities of Crystal Spectra of Rare‐Earth Ions , 1962 .