新型激光晶体α-Nd∶Ba_3Y(BO_3)_3光谱性能研究

Optical Characterization of α-Nd∶Ba_3Y(BO_3)_3 Crystal

研究了高温相掺钕硼酸钇钡α Nd∶Ba3Y(BO3)3(α NBYB)晶体的光谱特性。α NBYB晶体具有R3空间群结构。吸收光谱表明:该晶体在808nm左右有比较强的吸收峰,其对应于4I9 2→4F5 2,2H9 2的能级跃迁,半峰宽(FWHM)15nm,相应的吸收截面为1.56×10-20cm2,荧光光谱表明:4F3 2→4I11 2能级跃迁有很强的荧光发射,其发射波长为1.058μm,相应的荧光寿命为70μs,发射跃迁截面为1.82×10-19cm2,并用J O理论计算了该晶体的振子强度参数:Ω2=1.43×10-20,Ω4=2.08×10-20,Ω6=2.45×10-20cm2。

The optical property of high temperature phase αNd∶Ba3Y(BO3)3(αNBYB) crystal, which belongs to space group R3, was investigated. The room temperature absorption spectrum shows that it has broad absorption band with a FWHM of 15 nm around 808nm and the absorption cross section is 1.56×10-20 cm2. The main fluorescence peak is centered at 1058 nm, which lifetime is about 70 μs and emission cross section is 1.82×10-19 cm2. Using the JO theory, the intensity parameters Ωλ(λ=2,4,6) were calculated: Ω2=1.43×10-20, Ω4= 2.08×10-20, Ω6=2.45×10-20 cm2.