Micro-channels were fabricated in sodalime glass through imprinting, and then joined to a glass slab by thermal assisted
direct bonding (TADB). These techniques are simple and low cost, suitable for mass production of micro-fluidic devices.
The joined samples were characterized before and after TADB by optical microscopy, profilometer, SEM, shear strength
test and Vickers hardness test. The integrity of channels is maintained also after the TADB. The interface between the
two glass slabs was found to be without impurities, bubbles and cracks. The bonding strength was also measured to be
31.94MPa.
TeO2-ZnF2-PbO-Nb2O5 based fluorotellurite glasses were synthesized and studied for the first time for laser
applications. The property characterizations including XRD and thermal analysis as well as optical properties
measurement were performed. It is demonstrated that this fluorotellurite system has good glass formation ability; and
increasing the ZnF2 concentration to 30 mol% can significantly increase the thermal stability of the glass. Adding ZnF2
also reduced remarkably the hydroxyl (OH) concentration of the glass resulting in lower optical absorption in the
infrared region, which is crucial for infrared laser applications. In addition, the glass absorption cut-off edge near 400 nm
blue-shifted with increasing ZnF2 addition.
In this paper Tm-doped tellurite glasses (75TeO2-20ZnO-5 Na2O, mol%) were prepared and characterized, and codoping
with Yb was investigated in order to improve pump efficiency and wavelength emission range. Emission spectra and
lifetime measurements were obtained by pumping Tm-doped tellurite glasses at 800 nm and Yb-Tm co-doped tellurite
glasses at 980 nm, thus exploiting the Yb-Tm energy transfer mechanism. Highly Yb-doped Tm-tellurite glasses were
investigated (Yb2O3 concentrations up to 5 wt%) and an increase in 3F4 lifetime with Yb2O3 concentrations higher than
3% was observed. This showed that high amounts of Yb do not affect lifetime of the metastable state, thus allowing
investigation of lasers in this range of doping concentrations.
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