Meng Xiangeng, Tanaka Katsuhisa, Murai Shunsuke, Fujita Koji, Miura Kiyotaka, Hirao Kazuyuki
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto, Japan.
Opt Lett. 2006 Oct 1;31(19):2867-9. doi: 10.1364/ol.31.002867.
We report a novel phenomenon in sodium-calcium-silicate glass doped with Ta(5+). Under irradiation with a 780 nm femtosecond pulsed laser, strong blue emission centered at about 420 nm could be observed. The spectral characteristics are similar to those pumped by ultraviolet photons. The log-log correlation between integrated emission intensity and pump power reveals that a two-photon absorption process is involved in the phenomenon. It is suggested that the presence of localized Ta(5+)5d(0) energy levels is responsible for the appearance of the blue emission. The results indicate that transition metal ions without d electrons play an important role in fields of optics when embedded into glass hosts.
我们报道了一种在掺杂Ta(5+)的钠钙硅酸盐玻璃中的新现象。在用780纳米飞秒脉冲激光照射下，可以观察到以约420纳米为中心的强烈蓝色发射。光谱特性与由紫外光子泵浦的特性相似。积分发射强度与泵浦功率之间的对数-对数相关性表明该现象涉及双光子吸收过程。有人认为，局域化的Ta(5+)5d(0)能级的存在是蓝色发射出现的原因。结果表明，没有d电子的过渡金属离子嵌入玻璃基质时在光学领域起着重要作用。
