High infrared transmission of Y~(3+)-Yb~(3+)-doped α-SiAlON

摘要

Dense dual Y~(3+)-Yb~(3+)-doped α-SiAlON ceramic containing extra addition of 2 wt.% Y_2O_3/Yb_2O_3 was fabricated by hot pressing at 1900 ℃ for 1 h, and its optical transmittance was investigated over the wavelength range 200-6000 nm. The results showed that the addition of 2 wt.% extra liquid phase could effectively promote Y/ Yb-α-SiAlONs densification and its assemblage only consisted of single crystallized α-SiAlON phase. The obtained sample had relatively high infrared light transmittance properties. The maximum transmittance in the medium infrared region for 1.0 mm thick specimen could reach around 72% at -2500 nm. It is attributed to the uniform, dense microstructure and few residual intereranular phases.