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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 transitions induced by the near-infrared femtosecond laser induced titania rutile single crystal were investigated by Raman spectroscopy. The experimental results show that when the average laser power is 300 mW, the Eg mode intensity of the rutile phase increases and the intensity of the A1g mode decreases with the increase of the irradiation time. The result shows that the laser induced crystals have a color center; the irradiation time is At 10 s, the anatase phase appeared. And with the increase of irradiation time, the intensity of Raman vibration mode of the anatase phase increased and the rutile phase decreased. However, when the irradiation time was determined to be 1/63 s, the ratio of the rutile Eg mode intensity to the Alg mode intensity increased without any anatase phase as the laser power increased.