992 resultados para Yb^3
Resumo:
YAG phosphor powders doped/codoped with Er(3+)/(Er(3+) + Yb(3+)) have been synthesised by using the solution combustion method. The effect of direct pumping into the (4)I(11/2) level under 980 nm excitation of doped/codoped Er(3+)/Yb(3+)-Er(3+) in Y(3)Al(5)O(12) (YAG) phosphor responsible for an infrared (IR) emission peaking at similar to 1.53 mu m corresponding to the (4)I(13/2)->(4)I(15/2) transition has been studied. YAG exhibits three thermally-stimulated luminescence (TSL) peaks at around 140A degrees C, 210A degrees C and 445A degrees C. Electron spin resonance (ESR) studies were carried out to identify the centres responsible for the TSL peaks. The room temperature ESR spectrum of irradiated phosphor appears to be a superposition of two distinct centres. One of the centres (centre I) with principal g-value 2.0176 is identified as O(-) ion, while centre II with an isotropic g-factor 2.0020 is assigned to an F(+) centre (singly ionised oxygen vacancy). An additional defect centre is observed during thermal-annealing experiments and this centre (assigned to F(+) centre) seems to originate from an F-centre (oxygen vacancy with two electrons) and these two centres appear to correlate with the observed high-temperature TSL peak in YAG phosphor.
Resumo:
Operation of a single-clad Dy 3+-doped ZrF 4-BaF 2-LaF 3-AlF 3-NaF (ZBLAN) fiber laser operating at mid-infrared near 3 m is presented. The laser is pumped by an Yb 3+-doped silica fiber laser centered at 1088 nm. An output of near 0.1 W with a slope efficiency of up to 23% with respect to absorbed pump power was measured. The laser performance, theoretical modeling and laser spectrum of Dy fiber laser system with respect to various cavity losses are studied. The experimental slope efficiency is more than 4.5 times higher than the previous demonstration, and is 64% of the Stokes efficiency limit. The efficiency was improved by using cavity mirrors of reflectivities of 99 and 50%. The emission central wavelength and spectral width are found to be dependent on the pump power and output coupler, reflectivity. 2011 by Astro Ltd., published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA.
Resumo:
70TeO2-(20-x)ZnO-xPbO-5La2O3-2.5K2O-25Na2O(x=05101520)Yb2O31Yb^3+((Tx-Tg)>195TZN(118))X=15(125pm^2)(
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Yb^3+YbYAG(IR)YbYAGIRYbYAGIRYbYAGYb^3+
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YbYAG940hmYbYAG498nmYb^3Yb^3Yb^3YAG4f^I3
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Yb^354at163at271at536at100atYbY3Al5O12Yb^3Yb^3SmakulaYb^3Yb^3271atYb^3536at
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Yb^3550100YbY3Al5O12YbYAGYb^3940nm LDYbYAGYb^3YbYbYAGYbAG
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1mYb^3YbYb
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LDQYb^3Yb^3Lu2SiO5Yb^1LSO257W490mW222-142299mW1084nm10341085nmInGaAsQ301058nm2539kHz
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YbFAPICP-AESYb^3YbFAP003Yb^3YbFAP77K300K-Yb^3YbFAPYbFAP904nm982nmYb
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Yb^35-30YbYAGYbYAGYh^3YbYAGYb^3YbYAG50nsYb^35YbYAG
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Nd^3+Yb^3+(<01)(LD)YbInGaAsYbYb
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Yb^3900980nmInGaAs9001100nm1000nmInGaAsYb^3YbYAGYbKYWYbGdVO4YbSYSYbYAB
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YbYAGYb^3YbYbYAGXYb^3CrYbYAGCr^4
Resumo:
YbFAPCaF2ICP-AESYb^3YbFAPYbFAPX
