摘要
在液相环境中，利用纳秒（ns）脉冲激光器轰击消融铬掺杂ZnSe（Cr^2＋：ZnSe）微米颗粒，制备出Cr^2＋：ZnSe纳米粒子，扫描电镜以及X射线衍射检测，结果显示，制备所得的粒子为平均尺寸为50nm的ZnSe闪锌矿结构纳米粒子。基于Cr^2＋：ZnSe纳米粒子，观察到中心波长为2180nm、阈值为0．4mJ／pulse的随机激光效应。相比于Cr^2＋：ZnSe晶体激光器，纳米粒子随机激光的中心波长发生了约170nm的蓝移，Cr^2＋：ZnSe纳米粒子的光致发光寿命也比Cr^2＋：ZnSe晶体要短。
Synthesized chromium doped ZnSe nanocrystalline particles （Cr^2＋： ZnSe NCPs） by using nanosecond pulsed laser ablation of polyerystalline Cr^2＋： ZnSe micron-sized powder in liquid environment. The scanning electron micrseope and X-ray diffraction results revealed that the products were ZnSe cubic sphalerite structure with an average size around 60nm. Based on the Cr^2＋： ZnSe nanoparticles, typical random laser emissions centering at 2175 nm with a threshold of 0.4 m J/pulse were observed. Compared to the Cr^2＋： ZnSe bulk laser, the central wavelength showed about 175nm blue-shift. The photoluminescence lifetime of Cr^2＋： ZnSe NCPs was shorter than that of Cr^2＋： ZnSe bulk.
