Spectroscopic properties of trivalent lanthanide ions in fluorophosphate glasses

Cassanjes

et al. 2003

Optical spectroscopic properties of Tm 3ϩ -doped 60TeO 2 Ϫ10GeO 2 Ϫ10K 2 OϪ10Li 2 O Ϫ10Nb 2 O 5 glass are reported. The absorption spectra were obtained and radiative parameters were determined using the Judd-Ofelt theory. Characteristics of excited states were studied in two sets of experiments. Excitation at 360 nm originates a relatively narrow band emission at 450 nm attributed to transition 1 D 2 → 3 F 4 of the Tm 3ϩ ion with photon energy larger than the band-gap energy of the glass matrix. Excitation at 655 nm originates a frequency upconverted emission at 450 nm ( 1 D 2 → 3 F 4 ) and emission at 790 nm ( 3 H 4 → 3 H 6 ). The radiative lifetimes of levels 1 D 2 and 3 H 4 were measured and the differences between their experimental values and the theoretical predictions are understood as due to the contribution of energy transfer among Tm 3ϩ ions.

Section: ͑3͒mentioning

confidence: 99%

Optical properties and frequency upconversion fluorescence in a Tm3+ -doped alkali niobium tellurite glass

Cassanjes

et al. 2003

“…Upconversion laser emission and amplified spontaneous emission studies have been reported for Tm 3ϩ doped optical fibers and channel waveguides. 1,2,12,13 Recently a number of reports became available where detailed spectroscopic properties of Tm 3ϩ were analyzed in glasses such as fluorozirconate, 14,15 fluoroindate, 16 -18 fluorophosphate, 19,20 fluoroindogallate, 21 and silicate. 22 Each glass host presents certain characteristics that favor specific applications.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, fluorophosphate glasses have been recently investigated because of their potential as a laser host material and optical amplifier. 19,[23][24][25] In this work, tungstate fluorophosphate glasses have been chosen as host matrices to study the spectroscopic properties of Tm 3ϩ . Two previous articles report some of the physical properties of these glasses.…”

Section: Introductionmentioning

confidence: 99%

Optical spectroscopy and frequency upconversion properties of Tm3+ doped tungstate fluorophosphate glasses

Jerez

et al. 2003

Tungstate fluorophosphate glasses of good optical quality were synthesized by fusion of the components and casting under air atmosphere. The absorption spectra from near-infrared to visible were obtained and the Judd-Ofelt parameters determined from the absorption bands. Transition probabilities, excited state lifetimes and transition branching ratios were determined from the measurements. Pumping with a 354.7 nm beam from a pulsed laser resulted in emission at 450 nm due to transition 1 D 2 → 3 F 4 in Tm 3ϩ ions and a broadband emission centered at Ϸ550 nm attributed to the glass matrix. When pumping at 650 nm, two emission bands at 450 nm ( 1 D 2 → 3 F 4 ) and at 790 nm ( 3 H 4 → 3 H 6 ) were observed. Excitation spectra were also obtained in order to understand the origin of both emissions. Theoretical and experimental lifetimes were determined and the results were explained in terms of multiphonon relaxation.

“…For example, fluorophosphate glasses have been investigated because of their potential as laser materials and optical amplifier media. 9,14,15 Here we present results for tungstate fluorophosphate ͑TFP͒ glass that is a new emerging photonic material. Recently, TFP glasses have been considered as host materials for fluorescence studies of RE ions and for nonlinear optics.…”

Section: Introductionmentioning

confidence: 95%

“…In particular, thulium ͑Tm 3+ ͒ and neodymium ͑Nd 3+ ͒ ions are recognized as efficient RE ions for obtaining laser emission and frequency up-conversion ͑UC͒. 1,2 A large number of reports are available where detailed spectroscopic properties of Tm 3+ and Nd 3+ were analyzed in glasses such as fluorozirconate, 1-4 fluoroindate, [5][6][7][8] fluorophosphate, 9,10 and silicate. 1,2,11 The investigation of ET processes between Tm 3+ and Nd 3+ was reported for different host materials.…”

Section: Introductionmentioning

confidence: 99%

Optical properties and energy transfer processes in (Tm3+, Nd3+) doped tungstate fluorophosphate glass

Brandão

et al. 2006

We investigate the linear optical properties and energy transfer processes in tungstate fluorophosphate glass doped with thulium ͑Tm 3+ ͒ and neodymium ͑Nd 3+ ͒ ions. The linear absorption spectra from 370 to 3000 nm were obtained. Transitions probabilities, radiative lifetimes, and transition branching ratios were determined using the Judd-Ofelt ͓Phys. Rev. 127, 750 ͑1962͒; J. Chem. Phys. 37, 511 ͑1962͔͒ theory. Frequency up-conversion to the blue region and fluorescence in the infrared were observed upon pulsed excitation in the range of 630-700 nm. The excitation spectra of the luminescence were obtained to understand the origin of the signals. The temporal decay of the fluorescence was measured for different concentrations of the doping ions. Energy transfer rates among the Tm 3+ and Nd 3+ ions were also determined.