利用显微拉曼光谱仪研究了近红外飞秒激光脉冲诱导二氧化钛金红石单晶所引起的相变。实验发现当激光的平均功率为300 mW时,随着辐照时间的增加,金红石相的Eg模式强度增强,而A1g模式强度减弱,由此得出激光诱导晶体产生了色心;辐照时间为10 s时,锐钛矿相出现;并且随着辐照时间的增加,锐钛矿相的拉曼振动模式强度增强,金红石相的减弱。然而当辐照时间确定为1/63 s时,随着激光功率的增加,金红石Eg模式强度与A1g模式强度的比值增加,而没有锐钛矿相出现。

The phase transformation of rutile TiO2 single crystal irradiated by femtosecond laser pulses was studied by micro-Raman spectroscopy. It is found that when the femtosecond laser average power is 300 mW, with the increase of irradiation time, the intensity of Raman active mode Eg increases while that of A1g decreases, which suggests that the color center is induced. When the irradiation time is about 10 s, the component of anatase emerges and with increase of the irradiation time the intensity of Raman active modes of anatase increases while that of rutile decreases. But if the irradiation time is 1/63 s, with the increase of average power of laser, the intensity of Eg increases and that of A1g decreases apparently within the ablation crater, and no anatase appears.