The femtosecond laser induced void array inside Al_2O_3 crystals was discussed.The void array was formed spontaneously under the irradiation of a single beam of infrared femtosecond laser which was focused at a fixed point inside the Al_2O_3 crystal sample.It was found that the regular voids only could be fabricated near the sample surface,which was different from the situation in CaF_2 single crystal reported before. The possible mechanism of the phenomena was also discussed.
We report on near-infrared to visible upconversion luminescence in transparent Eu-doped SrO-TiO-SiO glass-cera...
Bin Zhu Songmin Zhang Shifeng Zhou Nan Jiang Jianrong Qiu 1 State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310027,China 2 Department of Physics and Astronomy Arizona State University,Tempe,Arizona 85257-1504,USA
We reported effect of various alkaline oxides on the broadband infrared luminescence from bismuth-doped aluminophosphate glasses.The samples of (99-x)P_2O_5-17Al_2O_3-xR_2O-1Bi_2O_3 (R=Li,Na and K, x=0 and 10 in mol%) were prepared under reducing condition controlled by additional carbon powders.The fluorescent intensity decreased with increasing content of alkaline oxides and basicity of host glasses.The 1/e fluorescence lifetime of the 72P_2O_5-17Al_2O_3-10R_2O-1Bi_2O_3 (R=Li,Na and K) glasses decreased from 461 to 316μs,as alkaline ions changed from Li^+ to K^+.
