Nd:KY(WO_4)_2和Nd:KG(WO_4)_2晶体吸收光谱性能分析  

Absorption spectrum analysis of Nd:KY(WO_4)_2 and Nd:KG(WO_4)_2 crystals

作　　者：郭丽花[1] 杨文琴[2] 冯尚源[2] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福州350007 [2]福建师范大学化学与材料学院,福州350007

出　　处：《应用光学》2007年第3期371-375,共5页Journal of Applied Optics

基　　金：福建省教育厅资助项目(JA03181;JB05310)

摘　　要：通过研究分析钨酸盐晶体Nd∶KY(WO4)2和Nd∶KG(WO4)2在室温下的吸收光谱,发现这2种晶体具有作为激光晶体的优良特性。根据Judd-Ofelt理论和测试所得的吸收光谱及数据,用VC++编程计算出晶体的谱线强度、振子强度、吸收截面等,拟合得Nd3+离子的3个晶场调节参数Ωλ(λ=2,4,6)的值,并从理论上计算了自发跃迁几率、能级寿命、荧光分支比和积分发射截面。从计算得出的荧光分支比β可以看出,Nd∶KY(WO4)2(β1060nm=0.438 0)和Nd∶KG(WO4)2(β1060nm=0.461 8)晶体荧光分支比都较大,计算了该晶体的X=Ω4/Ω6,并将其X值与其他晶体的X值加以比较,Nd∶KY(WO4)2和Nd∶KG(WO4)2均易于实现1.06μm激光输出,适合作为LD泵浦的钨酸盐晶体激光器。Nd ： KY（WO4）2 and Nd ： KG（WO4）2 crystals are proved to be good laser crystals through the analysis of their absorption spectrum at room temperature. According to the absorption spectrum and data derived from Judd-Ofelt theory as well as measured absorption and data obtained from the test, VC＋ ＋ program was used to calculate the intensity of spectral line, oscillator strength and absorption cross-section of the crystals. Then the values of three crystal-field adjusting parameters Ωλ（λ=2,4,6） of Nd^3＋ ion were obtained by fitting calculation. The spontaneous transition probability, energy level lifetime, fluorescence branch ratio and integrated emission cross-section were calculated theoretically. The calculated fluorescence branch ratio β indicates that the fluorescence branch ratios of both Nd ,Nd∶KY（WO4）2（β1060nm=0.438 0） and Nd∶KG（WO4）2（β1060nm=0.461 8） crystals are large. At last, X=Ω4/Ω6 of Nd ： KY（WO4）2 and Nd ： KG（WO4）2 crystals were calculated and compared with those of other laser crystals. It is concluded that Nd ： KY （WO4）2 and Nd ： KG （WO4）2 crystals can produce 1 060 nm laser.

关 键 词：Nd∶KY(WO4)2晶体 Nd∶KG(WO4)2晶体 吸收光谱 JUDD-OFELT理论 光谱参数 

分 类 号：O433.434[机械工程—光学工程]