掺镱钼酸锶激光晶体的光谱研究

庄任重; 张剑锋; 郭丽花

掺镱钼酸锶激光晶体的光谱研究

1.
龙岩学院物理与机电工程学院,福建省龙岩市364000

详细信息

通讯作者:
庄任重(1981-) ，男，福建福州人，讲师，主要从事晶体材料方面的研究。

中图分类号: TN241
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出版历程
- 刊出日期: 2011-01-15

A Spectral properties of strontium molybdate laser crystal doped with ytterbium ion

1.
Longyan University,Physics and Electromechanical Department,Longyan 364000,China

摘要

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976nm有最强吸收，该处的吸收截面为1.7110-20cm2，吸收半峰宽为71nm。由荧光光谱得到晶体的发射峰在1021nm，发射谱带半峰宽为44nm。由倒易法计算了晶体的发射截面，计算得出晶体在1021nm处的发射截面为1.2410-20cm2。通过拟合荧光寿命衰减曲线得到Yb3+∶SrMoO4晶体的荧光寿命为878s。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4.35kW/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0.44kW/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。
- 吸收光谱 /
- 发射光谱 /
- 激光晶体 /
- 钼酸锶
Abstract: The spectra properties of Yb3+∶SrMoO4 crystal were investigated by employing the absorption and emission spectra. The strongest absorption is observed at 976nm in the absorption spectra. The absorption cross-section is 1.7110-20cm2 at 976nm. The absorption band has a FWHM of 71nm. 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 1021nm. The emission band has a FWHM of 44nm. The emission cross-section calculated by the reciprocity method is 1.2410-20cm2 at 1021nm. The fluorescence lifetime of Yb3+∶SrMoO4 crystal is 878s 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 4.35kW/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 0.44kW/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.
- absorption spectra /
- emission spectra /
- laser crystals /
- strontium molybdate

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