Spectroscopic properties of lead fluoroborate and heavy metal oxide glasses doped with Yb 3+ (original) (raw)
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Spectroscopic properties of lead fluoroborate glasses codoped with Er^3+ and Yb^3+
Journal of The Optical Society of America, 2002
A new glass of heavy metal oxide (25.0Bi 2 O 3 -57.0PbO-18.0Ga 2 O 3 (mol%)) doped with Yb 3þ is presented and compared with lead fluoroborate glass (43.5H 3 BO 3 -22.5PbCO 3 -34.0PbF 2 (mol%)), also doped with ytterbium. The interest in Yb 3þ for laser action and short pulse generation under diode pumping has been reported in the literature. Spectroscopic properties were studied for both glasses doped with 0.5 mol% of Yb 2 O 3 . The absorption cross-section of the heavy metal oxide glass is ð2:20 AE 0:15Þ Â 10 À20 cm 2 at the absorption peak wavelength of 968 nm and its emission cross-section is ð0:75 AE 0:05Þ Â 10 À20 cm 2 at the extraction wavelength of 1012 nm. A fluorescence effective linewidth of 86 nm and a fluorescence lifetime of 0.40 ms were measured. In the case of the lead fluoroborate glass used for comparison, these values change to ð2:56 AE 0:18Þ Â 10 À20 cm 2 (absorption cross-section), ð1:07 AE 0:08Þ Â 10 À20 cm 2 (emission cross-section at 1022 nm), 60 nm (fluorescence effective linewidth) and 0.81 ms (fluorescence lifetime). Calculations of the minimum pump intensity are also presented. Both have spectroscopic properties for laser applications that are similar to those of other known glasses (phosphate and tellurite laser glasses) used as active laser media. The large emission bandwidth measured for the heavy metal oxide is of interest for tunable lasers. Ó
Glasses of heavy metal oxide doped with ytterbium
2001
A new ytterbium doped heavy metal oxide glass (Yb:BPG) is presented in this work. The literature published the use of Pr 3+ , Dy 3+ , Tm 3+ and Er 3+ , in this host. We reported last year the use of Nd 3+ and now the use of Yb 3+ ; the glass has high refractive index (of 2.52), transmission cutoff in the far infrared (at 9µm), knoop hardness of 321kg/mm 2 and density of 4.63g/cm 3 . The concentration of Yb 3+ was determined using the X ray fluorescent spectrometry. For 0.5wt% of Yb 2 O 3 the absorption cross-section is of 2.2x10 -20 cm 2 at the laser pump wavelength (968nm), the radiative lifetime is of 300µs, the fluorescence effective linewidth is of 86nm and the emission cross-section is of 0.75x10 -20 cm 2 at 1012nm.
Spectroscopic properties of lead fluoroborate and heavy metal oxide glasses doped with Yb< sup> 3+
2002
Energy transfer at 1500 nm in lead fluoroborate glasses (PbO-PbF 2-B 2 O 3) codoped with Er 3ϩ and Yb 3ϩ is studied for the first time to the authors' knowledge. A sample codoped with 1 mol. % of Yb 2 O 3 and 0.01 mol. % of Er 2 O 3 has a measured fluorescence lifetime of (1.30 Ϯ 0.07) ms and an energy transfer efficiency of 80%. Also, a large emission band, of 72.4 nm has a measured peak emission cross section of (0.73 Ϯ 0.06) ϫ 10 Ϫ20 cm 2. The calculated Judd-Ofelt parameters are ⍀ 2 ϭ (3.51 Ϯ 0.14) ϫ 10 Ϫ20 cm 2 , ⍀ 4 ϭ (1.09 Ϯ 0.07) ϫ 10 Ϫ20 cm 2 , and ⍀ 6 ϭ (0.94 Ϯ 0.07) ϫ 10 Ϫ20 cm 2. The temporal evolution of the Yb 3ϩ fluorescence is fitted by use of the Yokota-Tanimoto expression to yield the Yb 3ϩ diffusion constant ͓(1.6 Ϯ 0.2) ϫ 10 Ϫ10 cm 2 s Ϫ1 ͔ and the critical radius of Yb 3ϩ /Er 3ϩ (18 Ϯ 1) ϫ 10 Ϫ8 cm. Results with the singly doped samples produced are presented to clarify the energy transfer process.
Spectroscopic properties of heavy metal oxide glasses doped with erbium
Journal of Luminescence, 2003
Glasses of heavy metal oxide (Bi 2 O 3 -PbO-Ga 2 O 3 ) doped with different concentrations of Er 3+ are presented. Measurements of absorption, emission and fluorescence lifetime at 1532 nm are shown. Measured lifetimes showed a maximum value of 3.94 ms for the glass with 0.50 wt% of Er 2 O 3 . The increase of lifetimes at low Er 2 O 3 concentration was attributed to radiation trapping whereas the subsequent decrease to concentration quenching. Interesting spectroscopic properties for laser action at 1532 nm were observed for the sample with 0.1 wt% of Er 2 O 3 : fluorescence lifetime of 3.76 ms, emission cross-section of 0.69 Â 10 À20 cm 2 and effective line width of 68.7 nm.
Spectroscopic properties of Yb3+ doped PbO–Bi2O3–Ga2O3 glasses for IR laser applications
Optical Materials, 2005
PbO-Bi 2 O 3 -Ga 2 O 3 glasses doped with different concentrations of Yb 3+ are presented. The spectroscopic properties and laser parameters are calculated and a comparison between different results obtained when calculating the Yb 3+ emission cross-section with the reciprocity method and with the Fuchtbauer-Ladenburg formula is presented. The behavior of the near-infrared luminescence is described theoretically by a rate equation and compared with the experimental results. This host doped with Yb 3+ is a promising material for laser action at 1019 nm, with properties similar to other known glasses used as active laser media; the emission cross-section of 1.1 · 10 À20 cm 2 , the high absorption cross-section (of 2.0 · 10 À20 cm 2 ) and a minimum pump intensity of 2.4 kW/cm 2 are interesting properties for short pulse generation.
Journal of Luminescence, 2003
Diode-pumped Yb-doped glass lasers have received considerable attention for applications such as high-power beam production or femtosecond pulses generation. In this paper, we evaluate the laser potential of three different glass families doped with Yb3+: alkali lead fluorborate (PbO–PbF2–B2O3), heavy metal oxide (Bi2O3–PbO–Ga2O3) and niobium tellurite (TeO2–Nb2O5–K2O–Li2O). Spectroscopic properties were studied for the samples and calculations of the minimum laser pump intensity (Imin), saturation fluence (Usat) and the theoretical limit of peak power (Pmax) are also presented. A comparison of laser properties of these three different glasses and their importance is shown and analyzed.
GeO 2�PbO�Bi 2O 3 glasses doped with Yb 3+ for laser applications
J Non Cryst Solids, 2004
Glasses of heavy metal oxide GeO 2 -PbO-Bi 2 O 3 doped with different concentrations of Yb 3+ were prepared as materials for IR emission. Absorption and fluorescence emission spectra were measured. The spectroscopic properties and laser parameters are calculated; the disagreement between the reciprocity method and Fuchtbauer-Ladenburg formula in calculations of Yb 3+ emission cross-sections is discussed using the radiation trapping effect. GeO 2 -PbO-Bi 2 O 3 glass doped with Yb 3+ is a promising material for laser action at 1021 nm, with properties similar to other known glasses (phosphate and tellurite laser glasses) used as active laser media; the high absorption cross-section (of 1.5 · 10 À20 cm 2 ) and the large emission bandwidth (of 70 nm) are properties appropriate for short pulse generation.
Heavy metal oxide glasses as active materials
Infrared Optical Fibers and Their Applications, 1999
The solubility of rare earths at a level of 0.5 mol% in traditional heavy metal oxide glasses based on bismuth, lead and gallium is limited to the largest cations Pr, Nd and Sm. Within the families ofthese oxide glasses, a higher level of doping was achieved in this work with a heavy metal oxide glass containing germanium as a fourth component. Spectroscopic studies on the Nd3 doped glasses revealed that the fluorescence peak for the 1 .3 jim transition occurred at a relatively long wavelength of about 1360 nm. Decay time constants for the 4F32 level were considerably shorter than in other host materials.
Optical Materials, 2011
Multicolor and white light emissions have been achieved in Yb 3+ , Tm 3+ and Ho 3+ triply doped heavy metal oxide glasses upon laser excitation at 980 nm. The red (660 nm), green (547 nm) and blue (478 nm) up conversion emissions of the rare earth (RE) ions triply doped TeO 2 -GeO 2 -Bi 2 O 3 -K 2 O glass (TGBK) have been investigated as a function of the RE concentration and excitation power of the 980 nm laser diode. The most appropriate combination of RE in the TGBK glass host (1.6 wt% Yb 2 O 3 , 0.6 wt% Tm 2 O 3 and 0.1 wt% Ho 2 O 3 ) has been determined with the purpose to tune the primary colors (RGB) respective emissions and generate white light emission by varying the pump power. The involved infrared to visible up conversion mechanisms mainly consist in a three-photon blue up conversion of Tm 3+ ions and a two-photon green and red up conversions of Ho 3+ ions. The resulting multicolor emissions have been described according to the CIE-1931 standards.
Fluorescence and Spectroscopic Properties of Yb3+-Doped Phosphate Glasses
Physics Procedia, 2012
The concentration dependent Yb 3+ : phosphate (P 2 O 5 + K 2 O + MgO + Al 2 O 3 + Yb 2 O 3) glasses have been prepared and characterized their fluorescence and laser properties. The stimulated emission cross-section and laser performance parameters were determined from the measured absorption spectra using the method of reciprocity. The refractive index, absorption and emission cross-sections and fluorescence lifetimes varied with Yb 3+ ion concentration. The higher emission cross-section was found to be 1.01 × 10-20 cm 2 at the extraction wavelength of 1005 nm. The fluorescence lifetime of 2 F 5/2 level decreases from 1.04 ms to 0.28 ms with increase of Yb 2 O 3 concentration from 0.05 to 6.0 mol %. The gain cross-section spectra can be obtained from the measured absorption and emission cross-sections with different population levels. The values of emission cross-section, fluorescence lifetime, minimum pulse duration, pump power, extraction efficiency and gain coefficients suggest that these glasses can be used as a laser gain media for the generation of ultrashort pulse and high power laser applications.