掺Yb3+氧化镧钇透明激光陶瓷的光谱特性

采用传统陶瓷烧结工艺,在无压还原气氛下低温制备出透明性良好的掺Yb3+氧化镧钇透明激光陶瓷,测试了其在室温下的吸收光谱、发射光谱和荧光寿命.结果表明,掺Yb3+氧化镧钇透明激光陶瓷的吸收系数随着Yb3+掺杂浓度的增加而增大,最强吸收峰974nm处的吸收截面为0.90～1.12×10－20 cm2;主发射峰1 032 nm和1 075 nm处的发射截面分别为1.05×10－20 cm2和0.87×10－20 cm2; Yb3+掺杂浓度为5at.%时荧光寿命为1.38 ms,并随Yb3+掺杂浓度的增加而减小;当Yb3+掺杂浓度超过10at.%时,样品中存在严重的浓度猝灭.产生浓度猝灭的原因是高掺杂时离子间存在合作上转换和能量转移.

Spectroscopic Characteristics of Yb3+-doped Yttrium Lanthanum Oxide Transparent Laser Ceramics

Highly transparent Yb3+-doped yttrium lanthanum oxide laser ceramics have been fabricated by conventional processing at low sintering temperature and sintered pressurelessly in H2 atmosphere.The absorption,emission spectra and fluorescence lifetime at room temperature were measured.The results indicate that the absorption coefficient of Yb3+-doped yttrium lanthanum oxide transparent laser ceramics isincreased with the increasing of Yb3+ content and the absorption cross-sections at 974 nm are 0.90～1.12×10－20 cm2.The emission cross-sections at 1 032 nm and 1 075 nm are 1.05×10－20 cm2 and 0.87×10－20 cm2,respectively.The fluorescence lifetime is 1.38 ms when Yb3+ content is 5at.% and the fluorescence lifetime is decreased with the increasing of Yb3+ content.There existed severe concentration quenching when Yb3+ content is above 10at.%.The concentration quenching is caused by cooperative up-conversion and energy transfer process between the ions in high Yb3+-doped yttrium lanthanum oxide transparent laser ceramics.