scholarly journals Optical Properties and White Light Emission of Dy3+ Doped Alumino Borotellurite Glasses

2019 ◽  
Vol 35 (4) ◽  
Author(s):  
Phan Van Do
Keyword(s):  
Optical Properties ◽  
Light Emission ◽  
Transition Probability ◽  
Emission Cross Section ◽  
Optical Gain ◽  
Emission Feature ◽  
Stimulated Emission ◽  
Luminescence Spectra ◽  
Intensity Parameters ◽  
Chromaticity Coordinates

Dy3+ doped alumino borotellurite (ABT) glasses xB2O3+(80-x)TeO2+10Al2O3+10CaO+ 0.5Dy2O3 (where x = 35; 45 and 55) have been prepared by melting method. Their optical properties were studied through absorption, luminescence spectra and decay time measurements. Judd-Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) have been determined using absorption spectra and are been used to calculate the radiative parameters like transition probability, stimulated emission cross-section, branching ratios, gain band width and optical gain for the 4F9/2→6H13/2 transition in Dy3+ ions. The chromaticity coordinates is used to estimate the emission feature of prepared glasses.

scholarly journals OPTICAL ABSORPTION AND STRUCTURAL STUDIES OF Pr3+ DOPED CADMIUM BISMUTH BORATE GLASSES IN VISIBLE AND NEAR INFRARED REGIONS

2013 ◽  
Vol 22 ◽  
pp. 408-415
Author(s):  
INDER PAL ◽  
ASHISH AGARWAL ◽  
SUJATA SANGHI ◽  
SANJAY ◽  
SUNIL BHARDWAJ
Keyword(s):  
Optical Absorption ◽  
Transition Probability ◽  
Emission Cross Section ◽  
Radiative Lifetime ◽  
Branching Ratio ◽  
Glass Network ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Luminescence Spectra ◽  
Ligand Field

Glasses having composition 20CdOxBi2O3(79.5-x)B2O30.5Pr6O11 with x varying from 15 to 35 mol% have been synthesized. Optical absorption and fluorescence spectra were measured at ambient temperature. A close correlation is observed between the Bi2O3 content and the spectroscopic properties such as Judd-Ofelt intensity parameters Ωλ = (λ = 2, 4, 6) , radiative and structural properties of prepared glasses doped with Pr3+ ion. The variation of Ω2 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth (RE) ion site (due to structural change) and to changes in RE-O covalency, whereas the variation of Ω6 has been related to the variation in RE-O covalency. Following the luminescence spectra, various radiative properties like transition probability (Arad), radiative lifetime (τr), branching ratio (βr) and stimulated emission cross section (σ) have been calculated. The branching ratio for 3P0 → 3F2 transition of Pr3+ glass system arrive at 41 to 40%, respectively, and the predicted spontaneous radiative transition probability rates are high and varies from 14032 to 14864 s−1. In addition, the glass stability is improved in which the substitution of B2O3 for Bi2O3 strengthens the glass network structure. The bismuth based glass as a host for Pr3+ ion doped suggesting their suitability for laser applications.

PHYSICAL, ABSORPTION AND FLUORESCENCE SPECTRAL STUDIES OF Pr3+ IONS DOPED LITHIUM BISMUTH BORATE GLASSES

2013 ◽  
Vol 22 ◽  
pp. 298-304
Author(s):  
BEENA BHATIA ◽  
VISHAL PARIHAR
Keyword(s):  
Transition Probability ◽  
Emission Cross Section ◽  
Radiative Lifetime ◽  
Branching Ratio ◽  
Emission Spectra ◽  
Radiative Transition ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Spectral Studies ◽  
Intensity Parameters

Glasses of the system: xB2O3-10Bi2O3-30Li2O-xPr6O11 where x =1, 1.5 and 2 were prepared by melt quenching technique. Optical absorption and emission spectra have been recorded. The intensities of f-f transition are calculated in term of Judd-Ofelt (JO) intensity parameters Ωλ (λ = 2, 4 and 6). Using the fluorescence data and these Ωλ parameters, various radiative properties like transition probability (Arad), branching ratio (βR), radiative lifetime (τR), and stimulated emission cross section (σp), of various emission lines have been evaluated. The branching ratio for 3P0→3H4 transition is 56% and the predicted spontaneous radiative transition probability rates are fairly high 16411 s−1. This is beneficial for lasing emission.

scholarly journals Spectral and Transmittance Properties of Er3+ Doped Zinc Lithium Lead Calcium Borophosphate Glasses

2021 ◽  
Vol 9 (12) ◽  
pp. 636-643
Author(s):  
S. L. Meena
Keyword(s):  
Optical Absorption ◽  
Emission Cross Section ◽  
Branching Ratio ◽  
Life Time ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Absorption Bands ◽  
Borophosphate Glasses ◽  
Intensity Parameters ◽  
Quenching Method

Abstract: Zinc lithium lead calcium borophosphate glasses containing Er3+ in (40- x):P2O5:10ZnO:10Li2O:10PbO:10CaO:20B2O3:xEr2O3 (where x=1, 1.5,2 mol %) have been prepared by melt-quenching method. The amorphous nature of the glasses was confirmed by x-ray diffraction studies. Optical absorption, Excitation, fluorescence and Transmittance spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters Ωλ (λ=2, 4, 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. Using these intensity parameters various radiative properties like spontaneous emission probability, branching ratio, radiative life time and stimulated emission cross–section of various emission lines have been evaluated. Keywords: ZLLCBP Glasses, Optical Properties, Judd-OfeltTheory, Transmittance Properties.

Optical Gain in Foerster Energy Transfer Based Organic Guest-Host-Systems

2009 ◽  
Vol 1197 ◽  
Author(s):  
Torsten Rabe ◽  
Sebastian Döring ◽  
Niko Hildebrandt ◽  
Thomas Riedl ◽  
Wolfgang Kowalsky ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Emission Cross Section ◽  
Pump Energy ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Wide Range ◽  
Förster Energy Transfer ◽  
Donor Acceptor ◽  
Stimulated Emission Cross Section

AbstractWe study the optical gain for various doping concentrations in a dye doped polymer (poly-[9,9-dioctylfluorene] with 6,6'-[2,2'-octyloxy-1,1'-binaphthyl] spacer groups (BN-PFO) doped by the stilbene dye 1,4-bis[2-[4-[N,N-di[p-tolyl]amino]phenyl]vinyl-benzene] (DPAVB)). In such a guest-host-system (GHS) the occupation of the upper laser level (dopant site) is due to Förster energy transfer (FET), which strongly depends on the donor acceptor distance and hence on the concentration of the laser dye. Therefore, the doping concentration is varied over a wide range and the gain coefficients are measured at various excitation densities to analyze the stimulated emission cross section.For the investigated GHS maximum gain coefficients up to ∼340 1/cm were found at absorbed pump energy densities of around 50 μJ/cm2. It will be shown that the stimulated emission cross section (σ = 1.8 × 10−16 cm2) is concentration independent which is quite different to a recently investigated small molecule based GHS. These effects will be discussed considering the rate and exciton diffusion constants.

Broadband ~1.5μm Emission of Er3+ in Heavy Metal Germanium Tellurite Glasses for Optical Fiber Amplifier

2011 ◽  
Vol 299-300 ◽  
pp. 538-541
Author(s):  
Xiao Liu ◽  
Quan Shen ◽  
Hai Lin ◽  
Dian Lai Yang
Keyword(s):  
Figure Of Merit ◽  
Emission Cross Section ◽  
Fiber Amplifier ◽  
Optical Amplifier ◽  
Stimulated Emission ◽  
Tellurite Glasses ◽  
Gain Bandwidth ◽  
Optical Fiber Amplifier ◽  
Intensity Parameters ◽  
Ir Emission

In Er3+/Yb3+codoped Na2O-ZnO-PbO-GeO2-TeO2(NZPGT) glasses, effective ~1.5mm infrared (IR) emission was investigated under 980nm excitation. Judd-Ofelt intensity parameters Wt (t = 2, 4, 6) had been calculated to be 6.78´10-20, 1.54´10-20, and 1.17´10-20cm2,respectively. The IR emission full width at half maximum (FWHM) is 73nm, and the maximum stimulated emission cross-section (se) is derived to be 7.53×10-21cm2. A figure of merit (FOM) as the product FWHM´se is adopted to evaluate the gain bandwidth. The comparison of FOM in different glasses indicated that Er3+/Yb3+codoped NZPGT glasses were potential materials in developing broadband optical amplifier.

scholarly journals Silicon Nanocrystals: Fundamental Theory and Implications for Stimulated Emission

2008 ◽  
Vol 2008 ◽  
pp. 1-32 ◽  
Author(s):  
V. A. Belyakov ◽  
V. A. Burdov ◽  
R. Lockwood ◽  
A. Meldrum
Keyword(s):  
Energy Transfer ◽  
Silicon Nanocrystals ◽  
Light Emission ◽  
Theoretical Calculations ◽  
Energy Levels ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Recombination Rates ◽  
Physical Mechanisms ◽  
Gain Profile

Silicon nanocrystals (NCs) represent one of the most promising material systems for light emission applications in microphotonics. In recent years, several groups have reported on the observation of optical gain or stimulated emission in silicon NCs or in porous silicon (PSi). These results suggest that silicon-NC-based waveguide amplifiers or silicon lasers are achievable. However, in order to obtain clear and reproducible evidence of stimulated emission, it is necessary to understand the physical mechanisms at work in the light emission process. In this paper, we report on the detailed theoretical aspects of the energy levels and recombination rates in doped and undoped Si NCs, and we discuss the effects of energy transfer mechanisms. The theoretical calculations are extended toward computational simulations of ensembles of interacting nanocrystals. We will show that inhomogeneous broadening and energy transfer remain significant problems that must be overcome in order to improve the gain profile and to minimize nonradiative effects. Finally, we suggest means by which these objectives may be achieved.

scholarly journals Synthesis, Structural and Luminescence Studies of Europium Doped Borate Glasses

2020 ◽  
Vol 9 (1) ◽  
pp. 9-16
Author(s):  
V L Usharani ◽  
B Eraiah
Keyword(s):  
Cross Sections ◽  
Transition Probabilities ◽  
Emission Cross Section ◽  
Radiative Lifetime ◽  
Emission Spectra ◽  
Optical Gain ◽  
Stimulated Emission ◽  
Melt Quenching ◽  
Fibre Amplifiers ◽  
Quenching Method

Different concentration of (0.1, 0.2, 0.3, 0.4, 0.5, 1.0 & 1.5) mol% of europium doped lead borate lithium glasses were prepared by melt quenching method. The properties of thermal, photoluminescence & structural were analyzed using DTA, FTIR and emission spectra. Emission spectra was used to evaluate the Judd-Ofelt (JO) parameters. Radiative parameters like stimulated emission cross-sections (σe), effective band width (∆λeff), transition probabilities (A), optical gain bandwidths (σe x ∆λeff), radiative lifetime (τrad) and optical gain (σe x τrad) values were evaluated for the transition 5D0→7Fj (j=1, 2, 3 and 4) of Eu3+ ions. The outcome of transition 5D0→7F4 at its highest value of branching ratios and stimulated emission cross-section are evaluated with the literature. Hence we can could the prepared host glass doped with Eu3+ ions are good fibre amplifiers and it can be used as a red laser.

Fluorescence Properties of Pr3+ Doped Calcium Fluoroborate Glasses

2010 ◽  
Vol 123-125 ◽  
pp. 1235-1238 ◽  
Author(s):  
J. Suresh Kumar ◽  
K. Pavani ◽  
T. Sasikala ◽  
B.C. Jamalaiah ◽  
M. Jayasimhadri ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Emission Cross Section ◽  
Visible Region ◽  
Stimulated Emission ◽  
Oscillator Strengths ◽  
Absorption Bands ◽  
Hypersensitive Transition ◽  
Emission Transition ◽  
Intensity Parameters ◽  
Wave Guides

Calcium fluoroborate glasses doped with trivalent praseodymium ions have been prepared using melt quenching technique with the molar composition (42-x) B2O3 + 20 CaF2 + 15 CaO + 15 BaO + 8 Al2O3 + x PrF3 (x = 0.05, 0.1, 0.5, 1.0, 2.0 and 4.0). Absorption, fluorescence and lifetime spectra were recorded for the title glasses. Judd-Ofelt intensity parameters Ωt (t = 2, 4 and 6) have been determined for the measured oscillator strengths of the absorption bands by including and excluding the 3H4 → 3P2 hypersensitive transition. From the intensity parameters spontaneous emission probabilities (AR), excited state radiative lifetimes (τR) and branching ratios (βR) were calculated. Fluorescence quenching is observed in all the peaks and is explained by energy transfer mechanisms. Using the fluorescence spectra stimulated emission cross section (σe) for all emission transitions have been estimated. Energy transfer processes were also explained to emphasize the quenching of fluorescence intensity of certain emission transition. Based on the results, the utility of Pr3+ doped calcium fluoroborate glasses as laser active materials as well as wave guides in the visible region is discussed.

Absorbance and Fluorescence Spectral Analysis of Sm3+ Ions Doped Bismuth Boro-Silicate Glasses

2012 ◽  
Vol 585 ◽  
pp. 279-283 ◽  
Author(s):  
Sunil Bhardwaj ◽  
Rajni Shukla ◽  
Sujata Sanghi ◽  
Ashish Agarwal ◽  
Inder Pal
Keyword(s):  
Transition Probabilities ◽  
Transition Probability ◽  
Branching Ratio ◽  
Life Time ◽  
Radiative Transition ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Potential Candidate ◽  
Borosilicate Glasses ◽  
Intensity Parameters

Glasses having compositions 20B2O3.(79.5-x)Bi2O3.xSiO2(10 ≤ x ≤ 40) doped with 0.5 mol% of Sm3+ions were prepared by melt quench technique. The amorphous nature of the glasses was confirmed by X-ray diffraction studies. The spectroscopic properties of Sm3+ions in bismuth borosilicate glasses as a function of bismuth oxide were investigated using optical absorption and fluorescence spectra. The Judd-Ofelt theory has been employed to calculate transitions probability from the data of absorption cross-section of several f-f transitions. The intensity parameters Ω2is related to the symmetry of glass hosts, where as the parameter Ω6is inversely proportional to the rare earth oxygen (RE-O) covalency. The variation of Ω4with Bi2O3content has been attributed to rigidity of the samples. Using the Judd Ofelt intensity parameters the other radiative properties like radiative transition probability, radiative life time, branching ratio and the stimulated emission cross-sections of prepared BBSS glasses have been calculated. A bright fluorescent orange emission at 600 nm (4G5/2→6H7/2) of Sm3+ion has been investigated as a function of Bi2O3in host glass. The radiative transition probabilities of Sm3+ions are large in bismuth borosilicate glasses, suggesting the suitability of these glasses as potential candidate for laser application.

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