Yb^(3+)∶LiYF_4激光晶体的生长与光谱性能

Bridgman growth and spectral properties of fluoride laser crystal Yb^(3+)∶ LiYF_4

报道了氟化物激光晶体Yb3+∶LiYF4的单晶生长与光谱性能。按照n(LiF)∶n(YF3)∶n(YbF3)=51.5∶47.5∶1.0制备配合料,经干燥HF气氛下的固相烧结合成制备出无水Yb3+∶LiYF4多晶料;采用非真空密闭条件下的坩埚下降法成功生长出系列12 mm尺寸的透明完整Yb3+∶LiYF4单晶。采用化学分析和光谱测量表征了所生长单晶的掺杂浓度和光谱性能,结果表明,Yb3+离子已成功掺杂进入基质晶体,其有效分凝系数估算为0.455;此单晶在较宽波长范围内具有良好光学透过性,在896 nm波长激发光作用下,该单晶具有930~1 030 nm波长范围的荧光发射,其荧光衰减寿命为1 888μs。

The Bridgman growth and spectral properties of fluoride laser crystal Yb3 ＋ ∶LiYF4 are reported in this paper.According to the molar ratio of n （LiF）∶n （YF3 ）∶n （YbF3 ）=5 1.5∶47.5∶1.0,the anhydrous polycrystalline material for Yb3 ＋ ∶ LiYF4 crystal growth was synthesized by means of the fluoridation process under dried HF atmosphere at elevated temperature.A series of Yb3 ＋ ∶LiYF4 single crystals with 12 mm in diameter were grown successfully by means of vertical Bridgman method under the sealed non-vacuum atmosphere.The dopant concentration and spectral properties of as-grown crystals were characterized by means of chemical analysis and spectroscopic measurements respectively.It was confirmed that Yb3 ＋ ions had been doped into LiYF4 host crystal with effective segregation coefficient estimated to be 0.455.The single crystals exhibit a high optical transmittance in a wide wavelength range from ultraviolet to infrared region.Under the photonic excitation at 896 nm,the single crystals possess a fluorescence emission at the wavelength ranges from 930 to 1 030 nm with decay life time of 1 888 μs.