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首次采用泡生法生长了掺铒钨酸镱钾(分子式:Er3+:KYb(WO4)2,简称:Er:KYbW)激光晶体。室温下测试了该晶体的吸收及上转换发射光谱。在荧光光谱中,观察到3个较为明显的上转换发射带,分别位于470~560nm,645~675 nm,750~850 nm。其中,位于533 nm处的上转换绿光强度最大。基于能量匹配原理分析了晶体上转换发光基质,结果表明,上转换红光和绿光的发光渠道均为双光子过程。根据J-O理论,计算了光谱参数,强度参数为:Ω2=16.342×10-20cm2,Ω4=4.183×10-20cm2,Ω6=1.264×10-20cm2;对应于绿光4S3/2-4I15/2跃迁的荧光分支比为76.37%,荧光寿命为278μs。这些光学参数表明Er:KYbW激光晶体可实现高效上转换绿光发射。
Erbium tungstate ytterbium potassium (formula: Er3 +: KYb (WO4) 2, abbreviation: Er: KYbW) was grown for the first time by bubble generation method. The absorption and up-conversion emission spectra of this crystal were tested at room temperature. In the fluorescence spectrum, three obvious up-conversion emission bands are observed, which are located at 470-560 nm, 645-675 nm and 750-850 nm, respectively. Among them, the up-conversion green light at 533 nm has the highest intensity. Based on the principle of energy matching, the upconversion luminescent matrix was analyzed. The results showed that both up-conversion red and green luminescent channels were two-photon processes. According to the JO theory, the spectral parameters were calculated. The intensity parameters were: Ω2 = 16.342 × 10-20cm2, Ω4 = 4.183 × 10-20cm2, Ω6 = 1.264 × 10-20cm2; corresponding to the green 4S3 / 2-4I15 / 2 transition The fluorescence branching ratio was 76.37% and the fluorescence lifetime was 278μs. These optical parameters indicate that Er: KYbW laser crystals can efficiently upconvert green emission.