掺镱钨酸锶晶体的生长及其性能表征

Growth and Properties of Yb^(3+)-Doped Strontium Tungstate Crystal

镱离子掺杂晶体材料是一类优秀的固体激光增益介质,已获得广泛应用。使用提拉法生长了不同镱离子掺杂浓度的钨酸锶(Yb∶SrWO_(4))晶体,通过X射线粉末衍射仪测定了其单晶结构,对粉末衍射数据精修得到了其晶胞参数。使用X射线荧光光谱法测定了晶体中镱离子的实际掺杂浓度,结果表明Yb∶SrWO4晶体中Yb^(3+)离子存在掺杂上限,随着Yb^(3+)离子掺杂浓度增加,晶体中主要的电荷补偿机制变为基质阳离子空位。同时,Yb∶SrWO4晶体的比热、热膨胀系数、热导率与纯钨酸锶(SrWO4)晶体相比无明显变化,在钨酸盐系列晶体中热学性能优良。上述结果表明Yb∶SrWO4晶体是一种具有一定应用潜力的固体激光增益介质。

Ytterbium doped crystal is a kind of excellent solid-state laser gain medium,which has been widely used.In this work,Yb∶SrWO_(4)crystals with different doping concentrations were grown by Czochralski method.The crystal structure was characterized by X-ray powder diffraction,and the cell parameters were obtained by analyzing the powder diffraction data.The actual doping concentration of Yb^(3+)in Yb∶SrWO_(4)crystal was investigated by X-ray fluorescence spectrometry,whose results show that there is an upper doping limit for the Yb^(3+)ions and the main charge compensation mechanism in the crystal changes with the increase of Yb^(3+)doping concentration.The thermal properties of Yb∶SrWO_(4)crystal with different doping concentrations were measured,whose results show that the specific heat,thermal expansion coefficient and thermal conductivity changed slightly compared with the undoped SrWO_(4)crystals,exhibiting excellent thermal properties.These results indicate that Yb∶SrWO_(4)crystal is a potential solid laser gain medium.