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Observation of ESA, ET and thermally enhanced frequency upconversion in Nd3+: LiTeO2 glass
Published online by Cambridge University Press: 06 February 2008
Abstract
Infrared to visible upconversion emission bands are observed in Nd3+:
LiTeO2 glass at 430, 482, 525, 535, 580, 600, 664 and 766 nm
wavelengths due to the 2P1/2$\to$
4I9/2,
2P1/2$\to$
4I11/2, 2P1/2$\to$
4I13/2, 4G7/2$\to$
4I9/2, 2P1/2$\to$
4I15/2, 4G7/2$\to $
4I11/2 &
4G5/2+2G7/2$\to$
4I9/2, 4G7/2$\to$
4I13/2 and 4G7/2$\to$
4I15/2 transitions, respectively. Mechanisms involved in these upconversion
emissions are shown to either involve excited state absorption or energy
transfer depending upon the concentration of the rare earth ions. The
emission bands at 755 and 968 nm are also observed due to the thermally
excited phonon absorption, on excitation with 800 nm wavelength. A 90 fold
enhancement in the intensity of anti-Stokes emission at 755 nm is observed
in this glass when temperature is raised from 298 to 523 K. Fluorescence
intensity ratio (FIR) and sensitivity (S) of the two thermally coupled
levels viz. 4F3/2 and 4F5/2 are calculated at different
temperatures and results show that these levels could act as temperature
sensor in tellurite host. Lifetimes of the excited levels 2P1/2,
4G7/2, 4F3/2, 4F5/2 and 4F7/2
involved in the emission process are also determined and their temperature
dependence is described.
- Type
- Research Article
- Information
- The European Physical Journal - Applied Physics , Volume 41 , Issue 2 , February 2008 , pp. 143 - 149
- Copyright
- © EDP Sciences, 2008
References
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