摘要
通过晶体的吸收光谱和荧光光谱研究了Yb3+∶SrMoO4激光晶体的光谱性能。由吸收光谱得到晶体在976 nm有最强吸收,该处的吸收截面为1.71×10-20cm2,吸收半峰宽为71 nm。由荧光光谱得到晶体的发射峰在1 021 nm,发射谱带半峰宽为44 nm。由倒易法计算了晶体的发射截面,计算得出晶体在1 021 nm处的发射截面为1.24×10-20cm2。通过拟合荧光寿命衰减曲线得到Yb3+∶SrMoO4晶体的荧光寿命为878μs。由光谱数据计算了Yb3+∶SrMoO4晶体的激光参数,计算得到饱和泵浦功率密度为4.35 kW/cm2,在激光输出波长处净透过所需要激发粒子的最小分数为10.08%,最小泵浦功率密度为0.44 kW/cm2。Yb3+∶SrMoO4晶体具有较大的吸收和发射半峰宽,较长的荧光寿命和较低的激光阈值,可成为一种潜在的LD泵浦激光材料,可能应用于飞秒激光及可调谐激光领域。
The spectra properties of Yb3＋∶SrMoO4 crystal were investigated by employing the absorption and emission spectra.The strongest absorption is observed at 976 nm in the absorption spectra.The absorption cross-section is 1.71×10-20 cm2 at 976 nm.The absorption band has a FWHM of 71 nm.The Stark energy levels of Yb3＋ in Yb3＋∶SrMoO4 crystal were obtained in the absorption spectra and low temperature emission spectra.The emission peak is at 1 021 nm.The emission band has a FWHM of 44 nm.The emission cross-section calculated by the reciprocity method is 1.24×10-20 cm2 at 1 021 nm.The fluorescence lifetime of Yb3＋∶SrMoO4 crystal is 878 μs by fitting the fluorescence decay curve.The laser parameters of Yb3＋∶SrMoO4 crystal were calculated by the spectral data,the pump saturation intensity parameter is 4.35 kW/cm2,the minimum fraction of Yb3＋ ions that must be excited to balance the ground state absorption and the gain exactly is 10.08%,the minimum pump intensity is 0.44 kW/cm2.For large absorption and emmision FWHM,long fluorescene lifetime and low laser threshold,Yb3＋∶SrMoO4 crystal could be considered as a LD pumped laser gain material and used in femto-laser and tunable laser area.
出处
《应用光学》
CAS
CSCD
北大核心
2011年第1期184-188,共5页
Journal of Applied Optics
基金
福建省自然科学基金(2009J05129)资助课题
关键词
吸收光谱
发射光谱
激光晶体
钼酸锶
absorption spectra
emission spectra
laser crystals
strontium molybdate
