Yb^(3+)掺杂KY(WO_4)_2激光晶体生长、结构与光谱分析  

Growth,structure and spectral properties of Yb^(3+)-dopedKY(WO_4)_2 laser crystal

作　　者：张礼杰[1] 雷鸣[1] 王宇明[1] 李建立[1] 孙彧[1] 刘景和[1] 

机构地区：[1]长春理工大学材料与化工学院,长春130022

出　　处：《物理学报》2006年第6期3141-3146,共6页Acta Physica Sinica

摘　　要：采用顶部籽晶提拉法(TSSG)生长出Yb:KY(WO4)2(Yb:KYW)激光晶体.对预烧后的原料及晶体进行了XRD分析,结果表明,分别在920℃和600℃预烧8h后的熔质和助熔剂基本上形成一相,抑止了实验中的挥发问题;所生长的晶体为β-Yb:KYW,计算其晶格常数为a=1·063nm,b=1·034nm,c=0·755nm,β=130·75°.测得不同厚度样品的吸收光谱,结果表明样品在933nm和981nm有较强的吸收峰,计算出主峰981nm的吸收截面σabs=5·34×10-20cm2.测得样品的荧光光谱,计算出主峰1030nm受激发射截面σem=3·1×10-20cm2,并估算其荧光寿命为0·56ms,与实测值0·60ms吻合.计算出激发态最小粒子数(β)、饱和抽运强度(Isat)和最小抽运强度(Imin),通过与其他掺Yb3+晶体比较,结果表明Yb:KYW晶体的Imin(0·24kW/cm2)很小.Yb^3＋ -doped KY（ WO4）2 （ Yb ： KYW） laser crystal was grown by top seeded solution growth （TSSG） method. The solute and solvent calcined at 920℃ and 600℃ respectively for 8h formed a single phase as shown by XRD analysis, which suppressed the volatilization in the growth process. The as-grown crystal was identified as β-Yb：KYW by XRD, and the cell parameters of Yb： KYW were calculated to be a = 1.063nm, b = 1.034nm, c = 0.755nm and β = 130.75°. Absorption spectrum of samples with different thickness （E//c） were obtained, in which two intensive peaks at 933nm and 981 nm were observed, and the absorption cross section is 5.34×10^-20cm^2 at the main peak of 981nm. Fluorescence spectrum of the sample was measured and there exist three intensive emission peaks at 990, 1010 and 1030nm. It was calculated that the peak emission cross section is 3.1×10^-20 cm^2 at 1030nm and the lifetime is 0.56ms which is closed to the measured value. The pumping parameter （β）, saturated pump intensity （Isat） and minimum pump intensity （Imin） were calculated, and the parameter Imin （24kW/cm^2 ） of Yb： KYW is very low compared to other Yb^3＋ doped crystals.

关 键 词：Yb:KYW TSSG法 晶体结构 光谱参数 

分 类 号：O782.5[理学—晶体学]