摘要
研究了808nm和977nm激光二极管抽运下铥/镱共掺TeO2-Ga2O3-R2O(R=Li,Na,K)玻璃光谱特性.利用Judd-Ofelt理论计算了Tm3+离子在碲镓酸盐玻璃中自发辐射跃迁概率、荧光分支比和辐射寿命等光谱参数.在977nm激光二极管抽运下,观测到Tm3+/Yb3+共掺碲镓酸盐玻璃很强的476nm上转换蓝光(1G4→3H6)和较弱的650nm上转换红光(1G4→3H4和3F2,3→3H6).分析表明476nm蓝光发射为三光子吸收过程,650nm红光发射为双光子和三光子混合吸收过程;而在808nm激光二极管抽运下,玻璃上转换蓝色荧光为双光子吸收过程.实验发现,随着碱金属离子半径的增大,977nm激光二极管抽运下蓝光上转换发光强度增强,而用808nm激光二极管抽运蓝光上转换发光无明显的变化.
This paper reports on upconversion properties of Tm^3＋/yb^3＋ co-doped TeO2-Ga2O3-R2O （R = Li, Na, K） glasses pumped by 808 and 977 nm laser diodes （LD）. An intense upconversion emission centered at 476-nm （blue） along with a weak emission at 650 nm （red） has been observed when pumped by 977 nm LD, assigned to the transitions of 1G4→3H4→3H6 and 1G4→ 3H4 and/or 3F2,3→3H6 of Tm^3＋,respectively. The 476-nm upconversion intensity has a nearly cubic dependence on incident pump laser power, indicating a three-photon process. However, a quadratic dependence of the 476-nm upconversion intensity on the incident pump laser power has been observed when pumped by 808 nm LD, due to two-photon absorption process. It is noticed that the intensity of the blue-upeonversion emission increases signifieantly with increasing radius of alkali metal of samples when pumped by 977 nm LD, while no obvious change has been observed when pumped by 808 nm LD.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第7期4194-4199,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:50472053)
新世纪优秀人才计划(批准号:04-0821和04-0823)
广州市科技项目(批准号:2004Z2-D0131
2006J1-C0491)
华南理工大学青年基金(批准号:123-E5040900)资助的课题.~~
