Spectroscopic and laser properties of erbium and ytterbium co-doped photo-thermo-refractive glass (original) (raw)
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Structural and optical properties of TeO2-Li2O-ZnO-Nb2O5-Er2O3 glass system
Journal of Non-Crystalline Solids, 2018
Quinary tellurite glass system in the percentages of 75TeO 2-5Li 2 O-10ZnO-(10-x) Nb 2 O 5-xEr 2 O 3 where (x = 0.0, 0.5, 1.0, 1.5, 2.0, and 2.8 mol%) have been prepared and characterized. Both Fourier-transform-infrared (FTIR) and Raman spectroscopies were performed to study the structural changes correlated with the glass network. The thermal characteristics of the system were specified which showed a higher thermal stability (> 100°C) due to the formation of more bridging oxygen's (BO's) revealed by (FTIR) and Raman spectroscopies. The optical absorption spectra within near UV-visible regions were performed, and exhibited nine absorption bands centered around 1536, 977, 798, 653, 545, 524, 490, 450, and 443 nm corresponding to the 4 I 15/2 ground state to the various excited states 4 I 13/2 , 4 I 11/2 , 4 I 9/2 , 4 F 9/2 , 4 S 3/2 , 2 H 11/2 , 4 F 7/2 , 4 F 5/2, and 4 F 3/2 respectively. The same measurement also showed increasing values of the optical band gap (E g) form 2.70 to 2.90 (eV) and decreasing the refractive index (n) from 2.48 to 2.42. Both the extinction coefficient data and the complex dielectric functions of the glasses were estimated. The different optical parameters were distinctly affected by increasing the Er 2 O 3 (mol %) and the structural changes. The radiative properties of the glass were calculated using J-O parameters. The Branching ratio (β) of 4 I 13/2 → 4 I 15/2 transition peaked at 1520.48 nm for Er 3+ ions has the highest value (1.000) also, the radiative lifetime (τ) of the same transition changed from 1.4510 to 1.8483. The gain cross-section of the laser transition level from 4 G 11/2 → 4 I 15/2 changed from 1.44 × 10 −20 to 1.92 × 10 −20 cm −1 in the existing glass system. The acquired results exhibited that the existent glass can be a good candidate in the fiber drawing and laser, non-linear optical applications.
SPECTROSCOPIC AND STRUCTURAL PROPERTIES OF TeO2-ZnO-Na2O-Er2O3-Au GLASSES
This paper reports the spectroscopic and structural properties of glasses with composition 70TeO 2-20ZnO-10Na 2 O-(x)Er 2 O 3-0.2Au (x=0.5, 1.0 and 1.5) synthesized using meltquenching technique. The physical and thermal properties of glass samples with different Er 2 O 3 contents are found to vary due to structural changes. The absorption spectra consist of seven bands attributed to the absorption from ground state (4 I 15/2) to various excited states of 4f shell. TEM micrograph confirms the presence of gold nanoparticles (Au NPs) with average size ~ 7.6 nm. The observed visible up-conversion (UC) emission under 779 nm excitation wavelength exhibits three bands centered at 533 nm (green), 547 nm (green) and 637 nm (red). The glass with 1.0 mol% Er 2 O 3 displays dominant enhancement (two fold) in the UC emission intensity for the green band (4 S 3/2 → 4 I 15/2) and relatively weaker enhancement for the red band (4 F 9/2 → 4 I 15/2). The enhancement is primarily ascribed to the energy transfer between Er 3+ ions and local field effect of Au NPs. The IR result reveals shifts of the peaks due to the incorporation of Er 2 O 3 of varying concentration that consequently change the bonding between ligands in the glass matrix. Our results suggest that the proposed glasses can be nominated as potential materials for the developments of optical devices.
Spectral analysis of RE 3+ (RE = Er, Nd, Pr and Ho):GeO 2 –B 2 O 3 –ZnO–LiF glasses
Journal of Physics: Condensed Matter, 2008
This paper reports on the absorption, visible and near-infrared luminescence properties of Er 3+ , Nd 3+ , Pr 3+ and Ho 3+ -doped alkali fluoride zinc boro germanate glasses. The x-ray diffraction (XRD) and differential thermal analysis (DTA) profiles of the host glass have been carried out, to confirm its structure and thermal stability. From the measured absorption spectra, Judd-Ofelt (JO) intensity parameters ( 2 , 4 and 6 ) have been calculated for all the studied ions. For Pr 3+ and Ho 3+ -doped glasses, upconversion emission spectra have also been measured. Decay curves were measured for the visible emissions of Er 3+ , Pr 3+ and Ho 3+ ions at 547 nm (Er 3+ : green), 604 nm and 641 nm (Pr 3+ : orange and red) and 658 nm (Ho 3+ : red), respectively. The near-infrared emission spectra of Er 3+ /Yb 3+ and Nd 3+ -doped glasses have shown full width at half maximum (FWHM) around 95 nm (for the 4 I 13/2 → 4 I 15/2 transition) and 63 nm (for the 4 F 3/2 → 4 I 11/2 transition), respectively. The measured maximum decay times of 4 I 13/2 → 4 I 15/2 transition (at wavelength 1.51 μm) are about 5.72 ms and 6.14 ms for 1.0Er 3+ and 1.0Er 3+ /2Yb 3+ (mol%)-codoped glasses, respectively. The maximum stimulated emission cross sections for 4 I 13/2 → 4 I 15/2 transition of Er 3+ and Er 3+ /Yb 3+ are 5.447 × 10 −21 cm 2 and 4.540 × 10 −21 cm 2 . These glasses with better thermal stability, bright visible emissions and broad near-infrared emissions should have potential applications in broadly tunable laser sources, interesting optical luminescent materials and broadband optical amplification in low-loss telecommunication windows.
Ceramics International, 2024
The present work is involved in synthesizing, characterizing, and evaluating the role of Er 3+ ion on structural, optical, and thermal properties of 20CaO-10ZrO 2-10Y 2 O 3-30 B 2 O 3-(30-x)SiO 2-xEr 2 O 3 (x = 0.3, 0.6, 1.0, and 1.5 mol%) compositions. The as-synthesized samples are characterized by various experimental techniques such as XRD, FTIR, Raman, UV visible spectroscopy, and DSC to study their suitability for optoelectronic applications. The density of glasses increases, whereas the molar volume decreases with the doping of Er 2 O 3 in place of SiO 2. The amorphous nature of the prepared samples is confirmed by the X-ray diffraction pattern. FTIR and Raman spectra confirm the presence of BO 4 and BO 3 structural units in the prepared glass samples. The UV-visible absorption spectra show 4 G 9/2 , 4 G 11/2 , 2 G 9/2 , 4 F 5/2 , 4 F 7/2 , 2 H 11/2 , and 4 F 9/2 transitions with the Er 2 O 3 doping. The optical band gap increases from 3.25 to 3.61 eV, whereas the refractive index decreases from 2.33 to 2.24 with increasing doping of Er 2 O 3 , except for the SE-1.5 glass sample. The molar refraction decreases with Er 2 O 3 doping. The glass transition temperature increases from 472 to 512 • C with Er 2 O 3 doping in place of SiO 2 , except for the SE-1.5 glass. SE-0.3 glass shows the highest thermal stability, while SE-1.5 glass shows the lowest thermal stability. Therefore, these glasses can be considered for application in optoelectronics.
Journal of Physics: Condensed Matter, 2008
In this paper, we present the spectroscopic properties of Er 3+ -, Er 3+ /Yb 3+ -and Er 3+ /Tm 3+ /Yb 3+ -doped novel tellurite glasses. From the measured absorption spectra, Judd-Ofelt (JO) intensity parameters ( 2 , 4 and 6 ) have been evaluated for the Er 3+ -doped glass. With 980 nm excitation three strong upconversion emission bands centered at 505, 520 and 630 nm were observed for both Er 3+ -and Er 3+ /Yb 3+ -codoped glasses and the characteristic near-infrared emission bands were spectrally centered at 1.535 μm. The near-infrared spectra of Er 3+ -and Er 3+ /Yb 3+ -doped glasses have shown full width at half-maxima (FWHM) around 100 nm and 120 nm for the erbium 4 I 13/2 → 4 I 15/2 transition, respectively. The measured maximum decay times of the 4 I 13/2 → 4 I 15/2 transition (at wavelength 1.535 μm) are about 7.24 ms and 7.68 ms for 1.0Er 3+ and 1.0Er 3+ /2Yb 3+ (mol%)-codoped glasses, respectively. The maximum stimulated emission cross sections for the 4 I 13/2 → 4 I 15/2 transition of Er 3+ and Er 3+ /Yb 3+ are 8.64 × 10 −21 and 6.78 × 10 −21 cm 2 . From 1Er 3+ /1Tm 3+ /2Yb 3+ (mol%)-codoped glass, broad near-infrared emission bands centered at 1510 nm (Er 3+ : 4 I 13/2 → 4 I 15/2 ) and 1637 nm (Tm 3+ : 3 F 4 → 3 H 6 ) with full width at half-maxima (FWHM) around 52 nm and 60 nm, respectively, were observed. These glasses with broad near-infrared emissions should have potential applications in tunable lasers and broadband optical amplification at low-loss telecommunication windows
Effect of the Addition of Pb3O4 and TiO2 on the Optical Properties of Er3+ /Yb3+ :TeO2 −WO3 Glasses
ACS Omega, 2019
Heavy metal oxide tungstate-based tellurite glasses TeO 2 −WO 3 (TW) containing Er 3+ / Yb 3+ ions have been prepared by the melting and quenching method. The optical absorption and upconversion (UC) emission studies for the doped/codoped glasses have been performed. The effect of the addition of Pb 3 O 4 and TiO 2 to the Er 3+ /Yb 3+ :TW glass on its physical properties, optical absorption, and UC emission spectra under 980 nm/808 nm excitations has been studied. A significant enhancement in the UC emission intensity lying in the green and red region has been observed on introducing Pb 3 O 4 and TiO 2 into the Er 3+ /Yb 3+ :TW glass. The improvement in the UC emission intensity and full width at half maximum of the bands have been explained on the basis of energy transfer, local field correction factor, and Urbach energy. The non-color tunability in the color emitted from the prepared Er 3+ /Yb 3+ :TWPTi glass upon near-infrared (NIR) excitation at different pump power has been reported. Also, the color-correlated temperature and color purity have been measured under both NIR excitations.
Energy transfer and optical gain properties of P2O5-ZnO-LiF: (Yb3+, Er3+) glasses
The present paper reports on the results pertaining to the emission properties of 0.5 mol% Er3+ and together (0.5 Yb3+ /0.5 Er3+) doped PZL (P2O5-ZnO-LiF) glasses prepared by a melt quenching method. From the optical absorption data, absorption and stimulated emission cross-sections have been evaluated using McCumber’s theory and further cross-sectional gain has also been computed for Yb3+/Er3+ doped glass. On exciting the single (Er3+) and dual rare earth ions (Yb3+/Er3+) doped glass sample at exci = 379 nm, three emission bands in the visible region 2H11/2-4I15/2 (526 nm), 4S3/2-4I15/2 (549 nm) and 4F9/2-4I15/2 (664 nm) are observed and while at exci = 980 nm (Laser Diode) excitation a broad emission at 1530 nm attributed to 4H13/2-4I15/2 is observed in the NIR region. The enhancement in visible and NIR emission intensities with the addition of Yb3+ to Er3+ due to an energy transfer process from Yb3+ to Er3+ has been explained in terms of an energy level diagram.
Effect of heat treatment on the structural and optical properties of tellurite glasses doped erbium
Journal of Luminescence, 2012
The 75TeO 2-20ZnO-4Na 2 CO 3-1Er 2 O 3 (in molar ratio) glass system was prepared by the conventional melt-quenching method. As such, the samples prepared were investigated by differential scanning calorimetry (DSC), X-ray diffractrometry (XRD), Raman spectroscopy and infrared luminescence. DSC analyses were carried out on our glass at different heating rates between 5 and 20 1C/min. The result of the annealing temperature on the spectroscopic properties of Er 3 þ in tellurite glasses was discussed. The activation energy, for surface crystallization, was determined graphically from a Kissinger-type plot and had a value about 897.2 kJ/mol. Crystalline phases for both a-TeO 2 , g-TeO 2 and Zn 2 Te 3 O 8 system were determined by the XRD method and were confirmed by Raman spectroscopy characterizations after heat treatment. The effect of heat treatment on absorption spectra and luminescence properties in the tellurite glass was also investigated. With heat treatment, the ultraviolet absorption edge presented a redshift. As a result, the Judd-Ofelt (J-O) intensity parameters (O 2 , O 4 , O 6) were determined. The spontaneous emission probabilities of some relevant transitions, the branching ratio and the radiative lifetimes of several excited states of Er 3 þ were predicted using intensity J-O parameters. The near infrared emission that corresponds to Er 3 þ : 4 I 13/2-4 I 15/2 can be significantly enhanced after heat treatment. Notably, it is found that the luminescence lifetime in the present system is much longer than that in most other glasses and glass ceramics. A comparative study on luminescence performance suggests that the obtained glass ceramic is a promising material for Er 3 þ doped fiber amplifiers.
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.