Spectroscopic Properties of Er3+-Doped Ga2O3-GeO2-Bi2O3-PbO Glass

2011 ◽  
Vol 399-401 ◽  
pp. 997-1001
Author(s):  
Dong Mei Shi ◽  
Ying Gang Zhao ◽  
Jin Liu ◽  
Xiao Feng Wang
Keyword(s):  
Cross Section ◽  
Emission Cross Section ◽  
Emission Spectra ◽  
Fiber Amplifier ◽  
Spectroscopic Properties ◽  
Full Width ◽  
Half Maximum ◽  
Intensity Parameters ◽  
Promising Application ◽  
Peak Emission

Spectroscopic properties in Er3+-doped Ga2O3-GeO2-Bi2O3-PbO（BP）glass have been investigated and their promising application as Er3+-doped fiber amplifiers (EDFA) has also been evaluated under the excitation of 980 nm. The important roles of Bi2O3 substitution for PbO on spectroscopic properties, such as Judd-Ofelt intensity parameters (t=2, 4, 6) and emission spectra of Er3+, have been studied. The calculated peak emission cross-section of the 4I13/2→4I15/2 transition of Er3+ ions are 16.03×10-21 cm2 when the substituted PbO content by Bi2O3 is about 25 mol. The product of the peak emission cross-section ( ) and the full width at half-maximum (FWHM) of the sample is~689.29×10-28 cm3, which is higher than that of Er3+-doped silicate, phosphate and ZBLAN glasses. It was found that the substitution of Bi2O3 for PbO provides two potentials: broadening the full width at half-maximum of 1.53 μm fluorescence and improving the values of FWHM× of Er3+. The results strongly support that the Er3+-doped BP2 glass could be identified as a promising material for achieving 1.53 μm fiber amplifier.

Luminescence Properties of Er3+-Doped Ga2O3-GeO2-Bi2O3-R2O (R=Na and K) for 1.53 μm Fiber Amplifier

2012 ◽  
Vol 510 ◽  
pp. 614-618
Author(s):  
Ying Gang Zhao ◽  
Dong Mei Shi ◽  
Xiao Feng Wang
Keyword(s):  
Cross Section ◽  
Laser Excitation ◽  
Upconversion Luminescence ◽  
Emission Cross Section ◽  
Fiber Amplifier ◽  
Spectroscopic Properties ◽  
Fiber Amplifiers ◽  
Alkali Metal Ions ◽  
Optical Fiber Amplifiers ◽  
Peak Emission

An intense broadband 1.53-μm emission with a full width at half-maximum of 51.2 nm and peak emission cross-section of 8.58×10-21 cm2 of Er3+-doped Ga2O3-GeO2-Bi2O3-R2O (R= Na+, K+) glass have been obtained upon 980 nm diode-laser excitation. Effects of alkali metal ions on the thermal stability and spectroscopic properties of Er3+-doped Ga2O3-GeO2-Bi2O3 glass have been investigated. It is found that the incorporation of Na+ replacing K+ into Er3+-doped Ga2O3-GeO2-Bi2O3 glass can effectively improve the 1.53-μm emission and deduce upconversion luminescence .The results show that Ga2O3-GeO2-Bi2O3-Na2O glass might be an attractive host material for their application in C-band optical fiber amplifiers.

Investigation on the Spectroscopic Properties of Yb3+-doped Phosphate Glass

2011 ◽  
Vol 335-336 ◽  
pp. 1035-1038
Author(s):  
Qi Sang ◽  
Shao Jun Wang ◽  
Xue Rong Wang ◽  
Jing Wen Lu
Keyword(s):  
Cross Section ◽  
Spectral Properties ◽  
Emission Cross Section ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Pump Intensity ◽  
Doping Content ◽  
Performance Parameters ◽  
Particle Count ◽  
Laser Glass

A series of the Yb3+ -doped phosphate laser glass have been prepared under high temperature and different doping content and the fluorescence and absorption spectrum is observed, respectively. The influences of the Yb3+ -doped content on the spectral properties of the glass are analyzed and the optimal mole fraction is 4 %. The emission cross-section and fluorescent lifetime is calculated with McCumber theory. Furthermore, the integrated absorption cross-section, the full width at half maximum of the emission spectra and the laser performance parameters such as least particle count, saturation pump intensity and lowest pump intensity of Yb3+ -doped laser glass is calculated.

scholarly journals Temperature-Dependent Stimulated Emission Cross-Section in Nd3+:YLF Crystal

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 431
Author(s):  
Giorgio Turri ◽  
Scott Webster ◽  
Michael Bass ◽  
Alessandra Toncelli
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Room Temperature ◽  
Radiative Decay ◽  
Emission Cross Section ◽  
Spectroscopic Properties ◽  
Stimulated Emission ◽  
Different Temperatures ◽  
Stimulated Emission Cross Section ◽  
Semi Empirical

Spectroscopic properties of neodymium-doped yttrium lithium fluoride were measured at different temperatures from 35 K to 350 K in specimens with 1 at% Nd3+ concentration. The absorption spectrum was measured at room temperature from 400 to 900 nm. The decay dynamics of the 4F3/2 multiplet was investigated by measuring the fluorescence lifetime as a function of the sample temperature, and the radiative decay time was derived by extrapolation to 0 K. The stimulated-emission cross-sections of the transitions from the 4F3/2 to the 4I9/2, 4I11/2, and 4I13/2 levels were obtained from the fluorescence spectrum measured at different temperatures, using the Aull–Jenssen technique. The results show consistency with most results previously published at room temperature, extending them over a broader range of temperatures. A semi-empirical formula for the magnitude of the stimulated-emission cross-section as a function of temperature in the 250 K to 350 K temperature range, is presented for the most intense transitions to the 4I11/2 and 4I13/2 levels.

Spectroscopic properties of Nd-doped phosphate glass with a high emission cross section

2002 ◽  
Vol 11 (6) ◽  
pp. 613-618 ◽  
Author(s):  
Mao Yan-Li ◽  
Sun Zhen-Rong ◽  
Jiang Xiu-Li ◽  
Deng Pei-Zhen ◽  
Gan Fu-Xi
Keyword(s):  
Cross Section ◽  
Phosphate Glass ◽  
Emission Cross Section ◽  
Spectroscopic Properties ◽  
High Emission

STUDIES ON OPTOELECTRONIC PROPERTIES OF Eu3+ ACTIVATED LaOCl NANOPHOSPHOR

2011 ◽  
Vol 25 (09) ◽  
pp. 685-696 ◽  
Author(s):  
A. CHOUBEY ◽  
S. SOM ◽  
R. KUMARI ◽  
S. K. SHARMA
Keyword(s):  
Band Gap ◽  
Cross Section ◽  
Energy Levels ◽  
Emission Cross Section ◽  
Laser System ◽  
Emission Spectra ◽  
Wide Band ◽  
Stimulated Emission ◽  
Phase Method ◽  
Stimulated Emission Cross Section

The 0.1 mol% europium ( Eu 3+) activated lanthanum oxychloride nanophosphor was prepared by the liquid-phase method. The X-ray diffraction analysis of the prepared compound exhibits the tetragonal structure having the particles size in the range of 18–21 nm. The band gap of Eu 3+ doped LaOCl phosphor was found to be around 5.2 eV using absorption and diffuse reflectance measurements. The photoluminescence (PL) emission spectra show the bright emission in orange–red region from 580 nm to 630 nm. The most intense emission peak at 621 nm was due to transition in energy levels 5 D 0 → 7 F 2 of Eu 3+ ions. The absorption and stimulated emission cross-section of the intense peak were found to be 4.135 × 10-20 cm2 and 8.9 × 10-20 cm2 respectively. The wide band gap and high stimulated emission cross-section of prepared nanophosphor makes its possible applications as red emitting phosphor in display devices and laser system.

scholarly journals Ultra Thin Flexible Octagonal Metamaterials Absorber

2018 ◽  
Vol 10 (3) ◽  
pp. 833
Author(s):  
H. Hassan ◽  
M. Abu
Keyword(s):  
Resonance Frequency ◽  
Cross Section ◽  
Triangular Lattice ◽  
Full Width Half Maximum ◽  
Metamaterial Absorber ◽  
Unit Cell ◽  
Basic Unit ◽  
Full Width ◽  
Half Maximum ◽  
Lattice Arrangement

<span lang="IN">An ultra thin flexible octagonal metamaterial absorber on 0.13 mm fastFilm D27 material has been presented in this paper. CST microwave studio was used in designing and simulating the octagonal metamaterial absorber. The flexible octagonal metamaterial absorber was resonated at 10 GHz with highly perfect absorbance of 99.98%. However, Full Width Half Maximum (FWHM) of the absorbance was relatively small 135 MHz affected from the ultra thin substrate used. By using triangular lattice arrangement of the unit cell, the FWHM could be increased to 171 MHz. Besides that, combination of resonating frequencies technique also had increased the FWHM more than 74% increment from basic unit cell with one resonance frequency. The flexibleness of the metamaterial absorber could increase the functionality of the metamaterial absorber to be used in any application especially in reducing radar cross section for stealth application.</span>

scholarly journals Er,Yb:Ca3RE2(BO3)4 (RE=Y, Gd) – Novel 1.5 μm Laser Crystals

2019 ◽  
Vol 10 (1) ◽  
pp. 14-22 ◽  
Author(s):  
K. N. Gorbachenya ◽  
R. V. Deineka ◽  
V. E. Kisel ◽  
A. S. Yasukevich ◽  
A. N. Shekhovtsov ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Spectral Range ◽  
Energy Levels ◽  
Emission Cross Section ◽  
Wide Band ◽  
Spectroscopic Properties ◽  
Beam Parameter ◽  
Active Media ◽  
Breakdown Spectroscopy

The search for new crystalline host materials for the usage in lasers emitting in the eye-safe spectral range of 1.5–1.6 µm is an important task. The aim of this work was to study the growth technique, spectroscopic properties and laser characteristics of new active media – crystals Er3+,Yb3+:Ca2RE2(BO3)4(RE=Y, Gd).Calcium-yttrium Er3+,Yb3+:Ca3Y2(BO3)4(CYB) and calcium-gadolinium Er3+,Yb3+: Ca2Gd2(BO3)4  (CGB) oxoborate crystals co-doped with erbium and ytterbium ions were investigated. Polarized absorption and emission cross-section spectra were determined. The lifetimes of4I11/2and4I13/2energy levels of Er3+ions were measured and ytterbium-erbium energy transfer efficiencies were estimated. The calculation of the gain cross-section spectra was performed. By using of Er3+,Yb3+: Ca2RE2(BO3)4 (RE=Y, Gd) crystals the laser performance was realized, for the first time to the best of our knowledge. The laser characteristics were studied in a quasi-CW (QCW) laser operation.The wide band with a peak at the wavelength of 976 nm is observed in the absorption spectra of both crystals. This peak coincides with the emission wavelength of the pump laser diodes for Yb-doped active media. The maximum value of absorption cross-section was 1.7 × 10–20cm2for polarizationE//bfor both crystals. The lifetimes of the upper laser level4I13/2of Er3+ions were 580 ± 30 μs and 550 ± 30 μs for Er,Yb:CYB and Er,Yb:CGB crystals, respectively. The energy transfer efficiencies from ytterbium to erbium ions for an Er,Yb:CYB and Er,Yb:CGB crystals were 94 % and 96 %, respectively. According to gain spectrum of the Er,Yb:CYB crystal the gain band peak is centered at the wavelength of 1530 nm. The maximum QCW output power was 0.5 W with slope efficiency of 13 % regarding to absorbed pump power for an Er,Yb: CYB crystal. The laser beam parameter M2did not exceed < 1.5.Based on the obtained results, it can be concluded that these crystals are promising active media for lasers emitting in the spectral range of 1.5–1.6 μm for the usage in laser rangefinder and laser-induced breakdown spectroscopy systems, and LIDARs.

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.

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.

Theoretical Calculation of Optical Collisional Cross Sections and α-Parameter Values for Transitions of Interest in Atomic Absorption Spectrometry

1977 ◽  
Vol 31 (5) ◽  
pp. 424-434 ◽  
Author(s):  
R. J. Lovett ◽  
M. L. Parsons
Keyword(s):  
Excited State ◽  
Hyperfine Structure ◽  
Cross Section ◽  
Cross Sections ◽  
Absorption Spectrometry ◽  
Full Width ◽  
Half Maximum ◽  
Line Broadening ◽  
Actual Shape ◽  
Parameter Values

A method has been developed for calculating optical collisional cross sections and subsequent a-parameter values for spectral transitions of interest to analytical atomic spectroscopists. A combination of classical and semiclassical line broadening theory is used. The calculated values compare well (±20% or less) with values determined experimentally for elements without extensive hyperfine structure. If hyperfine structure is significant, the calculated a-parameter can be used to calculate the full width at half maximum of the spectral transition, but not the actual shape. The cross section values are found to correlate well with the proximity of the energy of the excited state of the atom to the ionization energy and to the orbitals involved in the electronic transition (e.g., s-p). A method of converting a values to different flame conditions has also been developed. Cross sections and a-parameter values for a total of 114 transitions from 52 elements have been calculated for the air-acetylene flame.

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