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采用顶部籽晶溶液法生长出铒镱共掺钨酸钆钾[Er3+:Yb3+:KGd(WO4)2,Er:Yb:KGW]激光晶体。测量了晶体的红外光谱、Raman光谱、吸收光谱和发射光谱,分析了晶体的振动模式,并对晶体振动光谱进行归属。利用Judd-Ofelt理论计算晶体的吸收及发射截面、强度参数、辐射跃迁几率、荧光分支比和荧光寿命等光谱参数。结果表明:Er:Yb:KGW晶体在380,523,935nm和981nm处存在较强的吸收峰,主峰981nm处的吸收截面为3.35×10-20cm2。强度参数为Ω 2=1.0729×10-20cm2, Ω 4=1.2956×10-20cm2, Ω 6=0.9335×10-20cm2。用488nm和980nm波长激发晶体,得到较强的1.53μm人眼安全波段激光,由于Yb3+对Er3+的敏化作用不仅可以提高泵浦光的吸收效率,而且可以降低激光振荡阈值。
Er3 +: Yb3 +: KGd (WO4) 2, Er: Yb: KGW] laser crystals were grown by the top seed solution method. The infrared spectra, Raman spectra, absorption spectra and emission spectra of the crystals were measured. The vibrational modes of the crystals were analyzed and the vibrational spectra of the crystals were assigned. Judd-Ofelt theory is used to calculate the absorption and emission cross sections, intensity parameters, radiation transition probability, fluorescence branching ratio and fluorescence lifetime. The results show that there are strong absorption peaks at 380,523,935nm and 981nm for Er: Yb: KGW crystal, and the absorption cross section at 981nm is 3.35 × 10-20cm2. The strength parameters were Ω 2 = 1.0729 × 10-20 cm 2, Ω 4 = 1.2956 × 10-20 cm 2, and Ω 6 = 0.9335 × 10-20 cm 2. Excitation of the crystal at 488nm and 980nm gives a strong 1.53μm eye-safe lasers, which can not only enhance the absorption efficiency of the pump light but also reduce the laser oscillation threshold due to the sensitization of Yb3 + to Er3 +.