Chen Nan-Kuang, Kuan Pei-Wen, Zhang Junjie, Zhang Liyan, Hu Lili, Lin Chinlon, Tong Limin
Department of Electro-Optical Engineering, National United University, Miaoli, Taiwan 360, Taiwan.
Opt Express. 2010 Dec 6;18(25):25615-26. doi: 10.1364/OE.18.025615.
We report multicolor upconversion emissions including the blue-violet, green, and red lights in a Tm 3+/Er3+codoped tellurite glass photonic microwire between two silica fiber tapers. A silica fiber is tapered until its evanescent field is exposed and then angled-cleaved at the tapered center to divide the tapered fibers into two parts. A tellurite glass is melted by a gas flame to cluster into a sphere at the tip of one tapered fiber. The other angled-cleaved tapered fiber is blended into the melted tellurite glass. When the tellurite glass is melted, the two silica fiber tapers are simultaneously moving outwards to draw the tellurite glass into a microwire in between. The advantage of angled-cleaving on fiber tapers is to avoid cavity resonances in high index photonic microwire. Thus, the broadband white light can be transmitted between silica fibers and a special optical property like high intensity upconversion emission can be achieved. A cw 1064 nm Nd:YAG laser light is launched into the Tm 3+/Er3+ codoped tellurite microwire through a silica fiber taper to generate the multicolor upconversion emissions, including the blue-violet, green, and red lights, simultaneously.
我们报道了在两根二氧化硅光纤锥之间的Tm³⁺/Er³⁺共掺杂碲酸盐玻璃光子微线中实现的包括蓝紫光、绿光和红光的多色上转换发射。将一根二氧化硅光纤逐渐拉细，直到其倏逝场暴露出来，然后在锥形中心进行斜切，将锥形光纤分成两部分。用气体火焰将碲酸盐玻璃熔化，使其在一根锥形光纤的尖端聚集成一个球体。将另一根斜切的锥形光纤融入熔化的碲酸盐玻璃中。当碲酸盐玻璃熔化时，两根二氧化硅光纤锥同时向外移动，将碲酸盐玻璃拉成中间的微线。光纤锥斜切的优点是避免在高折射率光子微线中产生腔共振。因此，宽带白光可以在二氧化硅光纤之间传输，并且可以实现诸如高强度上转换发射等特殊光学特性。通过一根二氧化硅光纤锥将连续波1064 nm Nd:YAG激光发射到Tm³⁺/Er³⁺共掺杂碲酸盐微线中，以同时产生包括蓝紫光、绿光和红光的多色上转换发射。
