摘要
制备了高折射率Ho3+单掺和Ho3+/Yb3+共掺低声子能量重金属碲酸盐玻璃。根据Judd-Ofelt理论对吸收光谱进行拟合,求得Ho3+强度参数Ωt(t=2,4,6)分别为4.373×10-20,1.906×10-20和1.451×10-20cm2,并进一步计算了Ho3+在红外区各能级跃迁的振子强度、自发辐射跃迁概率、辐射寿命和荧光分支比等光谱参数。982nm激发下,铋碲酸盐玻璃中Yb3+直接敏化Ho3+,在红外区产生有效红外发射。Ho3+吸收与发射截面在1.95和2.05μm处分别高达5.63×10-21和6.24×10-21cm2,大于Ho3+掺杂磷酸盐和氟化物玻璃,这有利于降低激光抽运阈值,实现高效Ho3+激光输出。较低的声子能量和较大的发射截面表明,Ho3+/Yb3+共掺杂铋碲酸盐玻璃有望成为良好的红外激光工作物质。
Ho^3＋ doped and Ho^3＋/Yb^3＋ co-doped low phonon heavy metal tellurite glasses with large refractive indices were designed and fabricated. Based on optical absorption, Judd-Ofelt parameters Ω2, Ω4 and Ω6 were derived to be 4. 373×10^-20 , 1. 906×10^-20 and 1. 451×10^20cm^2 , respectively. Then the radiative transition probabilities, radiative lifetimes and fluorescence branching ratios were calculated. The efficient infrared emission in Ho^3＋/Yb^3＋ co-doped bismuth tellurite glass system was recorded under the pumping of a 982 nm diode laser and Yb^3＋ was considered to be a preferable sensitizer for catching remarkable pumping energy and transferring considerable energy to Ho^3＋. The maximum absorption and calculated emission cross sections are 5.63×10^-21 cm^2 at 1.95 mm and 6.24×10^-21cm^2 at 2.05mm, respectively, which are larger than the values in phosphate and fluoride glasses, and are beneficial in lowing laser threshold as well as realizing efficient laser output of Ho^3＋. Low maximum photon energy and high emission cross sections indicate that Ho^3＋/Yb^3＋ co-doped low phonon bismuth tellurite glasses will be promising infrared laser materials.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第4期883-886,共4页
Spectroscopy and Spectral Analysis
基金
辽宁省教育厅高等学校科学研究基金项目(05L076,20060162)
辽宁省自然科学基金项目(20041067)资助
关键词
重金属碲酸盐玻璃
钬
光谱参数
红外辐射
Heavy metal tellurite glasses
Ho^3＋
Spectral parameters
Infrared radiation
