263 resultados para Yb3
Resumo:
The Er3+-Yb3+ codoped Al2O3 has been prepared by the sol-gel method using the aluminium isopropoxide [Al(OC3H7)(3)]-derived Al2O3 sols with addition of the erbium nitrate [Er(NO3)(3) center dot 5H(2)O] and ytterbium nitrate [Yb(NO3)(3) center dot 5H(2)O]. The phase structure, including only two crystalline types of doped Al2O3 phases, theta and gamma, was obtained for the 1 mol% Er3+ and 5 mol% Yb3+ codoped Al2O3 at the sintering temperature of 1,273 K. By a 978 nm semiconductor laser diodes excitation, the visible up-conversion emissions centered at about 523, 545, and 660 nm were obtained. The temperature dependence of the green up-conversion emissions was studied over a wide temperature range of 300-825 K, and the reasonable agreement between the calculated temperature by the fluorescence intensity ratio (FIR) theory and the measured temperature proved that Er3+-Yb3+ codoped Al2O3 plays an important role in the application of high temperature sensor.
Resumo:
A master-oscillator fiber power amplifier (MOPA) system with a 4-m-long Yb3+-doped homemade large mode area (LMA) double-clad fiber is reported. The system emits up to 133.8 W of amplified radiation at a wavelength of 1064 nm and a repetition rate of 100 kHz, limited only by the available pump power. Peak power of 300 kW at 20 kHz with a pulse duration of 15 ns is obtained. (c) 2006 Society of Photo-Optical Instrumentation Engineers.
Resumo:
A master-oscillator fiber power amplifier (MOPA) system with a 4-m-long Yb3+-doped homemade large mode area (LMA) double-clad fiber is reported. The system emits up to 133.8 W of amplified radiation at a wavelength of 1064 nm and a repetition rate of 100 kHz, limited only by the available pump power. Peak power of 300 kW at 20 kHz with a pulse duration of 15 ns is obtained. (c) 2006 Society of Photo-Optical Instrumentation Engineers.
Resumo:
CW laser output has been demonstrated for polycrystalline transparent 10 at.% Yb3+-doped Y2O3 ceramics. End-pumped with 970 nm laser diode, a maximum output power of 5.5 W has been obtained with absorbed pump power of 31.1 W. The slope efficiency is 25% while the threshold pump power is 5.6 W. Saturation is not observed in our experiments, indicating higher laser output can be expected with higher pump power. (C) 2004 Elsevier B.V. All rights reserved.
Resumo:
In this article, we report an all-fiber master oscillator power amplifier (MOPA) system, which can provide high repetition rate and nanosecond pulse with diffraction-limit. The system was constructed using a (2 + 1) X 1 multimode combiner. The Q-Switched, LD pumped Nd:YVO4 solid-state laser wets used (is master oscillator. The 976-nm fiber-coupled module is used as pump source. A 10-m long China-made Yb3+-doped D-shape double-clad large-mode-area fiber was used as amplifier fiber. The MOPA produced as much as 20-W average power with nanosecond pulse and near diffraction limited. The pulse duration is maintained at about 15 its during 50-175 kHz. The system employs a simple and compact architecture and is therefore suitable for the use in practical applications such as scientific and military airborne LIDAR and imaging. Based oil this system. the amplification performances of. the all fiber amplifier is investigated. (C) 2008 Wiley Periodicals, Inc.
Resumo:
Tm^3Yb^3nSiO2-030nPbF2-050n=Al2O3=015nAlF3=0049-xnTmF3=ynYbF3=xx=00001001000150020y=00001970nmTm^3Yb^3452n
Resumo:
15Li2O-15Nb2O5-70TeO2-0.1Er2O3-0.4Yb2O3%, , . XXRD, Yb6Te5O19.2Er6Te5O19.2, 55 nm. Judd-OfeltEr^3tt2, 4, 6Er^34I15/24I13/2, McCumber
Resumo:
Tm^3+Yb^3+RamanTm^3+Yb^3+Tm^3+Yb^3+Tm^3+Yb^3+
Resumo:
Er^3+Tm^3+/Yb^3+Raman980nmLD(476nm)(530nm545nm)(656nm)(476nm)Tm^3+1^G43^3H6(530nm545nm)Er^3+2^H11/24^I1524^S3/24^I15/2(6
Resumo:
070TeO2-(020-x)ZnO-xGeO2005La2O3-0025K2O-0025Na2O-001Yb2O3(x=0,005010015020)Yb^3+070TeO2-020GeO2-005La2O3-0025K2O-0025Na2O(TZN)(1
Resumo:
70TeO2-(20-x)ZnO-xPbO-5La2O3-2.5K2O-25Na2O(x=05101520)Yb2O31Yb^3+((Tx-Tg)>195TZN(118))X=15(125pm^2)(
Resumo:
Cr^3Yb^3Er^3QEr2O3Er2O305wt01Hz145mJ96mJ055Cr14KigreQE-7S
Resumo:
Er^3/Yb^3. , McCumberEr^31533 nm0.8410^-20 cm^2, ^4I13/28.5 ms. , Er^3/Yb^3. , 80 mW, 16.5%.
Resumo:
An interesting fluorescence intensity reverse photonic phenomenon between red and green fluorescence is investigated. The dynamic range. of intensity reverse between red and green fluorescence of Er( 0.5) Yb( 3): FOV oxyfluoride nanophase vitroceramics, when excited by 378.5nm and 522.5nm light respectively, is about 4.32 x 10(2). It is calculated that the phonon- assistant energy transfer rate of the electric multi- dipole interaction of {(4)G(11/2)( Er3+) -> F-4(9/2)( Er3+), F-2(7/2)( Yb3+). F-2(5/2)( Yb3+)} energy transfer of Er( 0.5) Yb( 3): FOV is around 1.380 x 10(8) s(-1), which is much larger than the relative multiphonon nonradiative relaxation rates 3.20 x 10(5) s(-1). That energy transfer rate for general material with same rare earth ion's concentration is about 1.194 x 10(5) s(-1). These are the reason to emerge the unusual intensity reverse phenomenon in Er( 0.5) Yb( 3): FOV. (C) 2007 Optical Society of America.
Resumo:
35SiO215AlO1.5-45-xPbF2-xCdF201TmF315YbF3x=0102030CdF2CdF2PbFCdF2Tm^3
