K+，Yb3+：BaWO4晶体光谱性能研究
Spectrum Characteritics of K+,Yb3+: BaWO4 Crystals
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摘要: 为提高Yb3+离子在BaWO4晶体中的掺入量,采用了双掺K+离子的方法,增大Yb3+离子的分凝系数,使K+(x(K+)=0.01),Yb3+(x(Yb3+)=0.02):BaWO4晶体在977 nm处的吸收系数达到α=0.494 cm-1.研究了波长为930 nm的LD激光抽运时相应于Yb3+离子2F5/2→2F7/2跃迁的960~1 020 nm的荧光光谱,其在1 005 nm处的发射截面σem=6.286 pm2,荧光寿命为0.4 ms.实验表明K+,Yb3+:BaWO4是一种新型近红外激光晶体。Abstract: To increase concentration of Yb3+-ions in BaWO4 crystals, co-doped K+-ions method were adopted. Absorption coefficient of K+ ( x (K+ ) = 0.01 ), Yb3+ ( x ( Yb3+) = 0.02) : BaWO4 crystals is a = 0.494 cm-1 at 977 nm. Fluorescence spectra of Yb3+-ions from 960 nm to 1 020 nm, corresponding to transition 2F5/2→2F7/2 was investigated. Emission cross section at 1 005 nm is 6. 286 × 10-20cm2, livetime is 0.4 ms. The experimental result shows that K+, Yb3+: BaWO4 is a potential laser crystal.
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