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.

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.

scholarly journals Physical and Spectroscopic Properties of Yb3+-Doped Fluorophosphate Laser Glasses

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Shujiang Liu ◽  
Anxian Lu
Keyword(s):  
Power Generation ◽  
Refractive Index ◽  
Cross Section ◽  
Emission Cross Section ◽  
Spectroscopic Properties ◽  
Pump Intensity ◽  
Gain Coefficient ◽  
Mechanical And Thermal Properties ◽  
Fluorophosphate Glass ◽  
Excellent Candidate

The physical properties including refractive index, Abbe number, nonlinear refractive index, microhardness and thermal expansion coefficient, and spectroscopic properties of Yb3+-doped fluorophosphate laser glasses were investigated. The results show that due to the addition of fluoride, mechanical and thermal properties are promoted, emission cross-section σemi is also greatly enhanced. The largest gain coefficient σemi·τm (0.824 pm2·ms) can be obtained with the minimum pump intensity Imin (1.112 kw/cm2). This kind of Yb3+-doped fluorophosphate glass is an excellent candidate material for Yb3+-doped host for high-power generation.

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

Yb:tellurite laser glass with high emission cross-section

1999 ◽  
Vol 41 (4) ◽  
pp. 209-214 ◽  
Author(s):  
Chun Jiang ◽  
Fuxi Gan ◽  
Junzhou Zhang ◽  
Peizhen Deng ◽  
Guosong Huang
Keyword(s):  
Cross Section ◽  
Emission Cross Section ◽  
Laser Glass ◽  
High Emission

Yb:phosphate laser glass with high emission cross-section

2000 ◽  
Vol 61 (8) ◽  
pp. 1217-1223 ◽  
Author(s):  
Chun Jiang ◽  
Hua Liu ◽  
Qingji Zeng ◽  
Xiaodong Tang ◽  
Fuxi Gan
Keyword(s):  
Cross Section ◽  
Emission Cross Section ◽  
Laser Glass ◽  
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 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.

Analysis of Tungstates and Sesquioxides, Two of the Best Yb3+-Doped Laser Crystals According to Different Evaluations.

2001 ◽  
Vol 667 ◽  
Author(s):  
Georges Boulon ◽  
Alain Brenier ◽  
Laetitia Laversenne ◽  
Yannick Guyot ◽  
Christelle Goutaudier ◽  
...  
Keyword(s):  
Emission Cross Section ◽  
Laser Action ◽  
Spectroscopic Properties ◽  
Pump Intensity ◽  
Laser Wavelength ◽  
Group I ◽  
Level Laser ◽  
Growth Method ◽  
Laser Crystals ◽  
Two Parameters

ABSTRACTThe development of reliable InGaAs laser diode pump sources emitting in the 900-980 nm spectral range is stongly influencing the field of lasers based on Yb3+-doped solid state crystals. Ca5(PO4)3F (C-FAP) and S-FAP (Sr5(PO4)3F) were soon recognized to be favourable hosts for Yb3+ lasing in the nanosecond pulse regime. This fact was supported by an evaluation of the spectroscopic properties of several Yb3+-doped crystals useful for laser action. This evaluation is based on two parameters known from spectroscopy, the emission cross-section at the laser wavelength and the minimum pump intensity required to achieve transparency at the laser wavelength.We think there is a need of a new evaluation of Yb3+-doped crystals in order to predict the laser efficiency in a more realistic manner in different kinds of regimes. We present here the main spectroscopic properties of two Yb3+-doped laser crystals which are grown in our Group: (i) KY(WO4)2 double tungstates by the Floating Crystal method and (ii) Y2O3sesquioxides by the Laser Heated Pedestal Growth method. The approach, based on a quasi-three level laser model, leads to compare all known Yb3+-doped crystals in a two-dimensional diagram considering the laser extracted power and the slope efficiency. We shall show that tungstates and sesquioxides belong to the highest laser crystal potential in CW-end pumping configuration.

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