Nd^(3+)掺杂的Sr_3Y_2(BO_3)_4晶体光谱特性研究

Spectra Properties of Nd^(3+)∶Sr_3Y_2(BO_3)_4 Crystal

采用提拉法生长出25mm×40mm的Nd3+∶Sr3Y2(BO3)4晶体,测试了该晶体的吸收光谱、荧光光谱及荧光寿命。结果表明:Nd3+∶Sr3Y2(BO3)4晶体在807nm附近有最强的吸收峰,其半峰宽(FWHM)为16nm,宽的吸收半峰宽适合于LD泵浦;从荧光光谱得到发射波长分别为910.8nm、1065.2nm和1399nm的荧光峰。根据吸收和荧光光谱,计算了晶体的吸收截面和发射截面。采用J-O理论计算了Nd3+在Sr3Y2(BO3)4中的强度参数、各能级的振子强度、自发辐射几率、荧光分支比等参数。计算结果表明,其强度参数Ω2=3.816×10-20cm2,Ω4=10.895×10-20cm2,Ω6=12.44×10-20cm2,辐射寿命为104μs,量子效率η=49.7%,荧光分支比β1(0.88μm)=0.429,β2(1.06μm)=0.461,β3(1.35μm)=0.107,β4(1.88μm)=0.003。

Nd^3＋： Sr3Y2 （BO3）4 crystal with dimension Ф25 mm ×40 mm were grown by Czochralski method. The absorption spectrum, fluorescence spectrum and fluorescence lifetimes of Nd^3＋ ： Sr3 Y2 （ BO3 ） 4 crystal were measured at room temperature. The results indicated that the strongest absorption band at 807 nm has a wide FWHM of 16 nm. Such broad line width is suitable for the diode laser pumping. Three emission peaks are observed at 910. 8 nm, 1065.2 nm and 1399 nm. According to the absorption and emission spectra, the absorption and emission cross section were calculated. Based on the J-O theory, the spectral parameters have been calculated. The oscillator strengths parameters Ωλ are/22 =3. 816 × 10^-20 cm^2, Ω4 = 10. 895 × 10^-20 cm^2,Ω6 = 12.44 × 10.20 cm^2. The radiative lifetime is 104 μs, and the quantum efficiency is 49.7%. The fluorescence branch ratios were calculated： β1 = 0.429,132 = 0.461,β2 = 0. 107,β3 = 0.003.