Abstract
This paper reports an up-conversion emission in violet (408 nm) from Nd 3+-doped 93SiO 2:7TiO 2:20AlO 1.5 glasses synthesized by the sol-gel process. Upon excitation at 583 nm ( 4I 9/2→ 4G 5/2), a bright violet up-conversion emission at 408 nm has been observed. The behavior of the up-conversion luminescence has been compared with that of the normal luminescence at both 408 and 1064 nm. The results show that while no concentration quenching for up to 2 mole Nd content is observed for the up-conversion emission, such an effect can be observed for the normal luminescence cases. Although the up-conversion luminescence has a shorter lifetime and weaker intensity, it is of use to the development of sol-gel glass-based waveguide lasers operating at the violet wavelength.
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