偏振激光诱导金属表面周期条纹结构机理的研究

发布时间：2019-04-22 19:03

【摘要】：不同偏振态激光诱导金属表面产生条纹结构的研究有很多,但对形成该结构的机理分析较少。通过在光路中插入1/4波片用于改变飞秒激光偏振态,使产生的偏振激光垂直照射到金属钨表面产生条纹结构,进而研究这种条纹结构的产生机理和激光偏振态对产生这种结构的影响。研究发现,不同偏振态的飞秒激光与对应诱导产生的条纹结构之间具有很好的一致性。当1/4波片周期性单向旋转时,激光偏振态随之周期性变化,金属表面形成的条纹结构的方向也相应地随之改变,最大偏转角度约π/4。对这种条纹方向随波片旋转而变化现象的机理进行了理论分析,分析表明不同偏振态的飞秒激光诱导金属表面产生条纹结构的方向由激光进入双折射晶体(如1/4波片)后分解的电矢量分量决定。
[Abstract]:There are many studies on the formation of striped structure on metal surface induced by different polarization laser, but the mechanism of formation of the structure is less analyzed. By inserting a 1? 4 wave plate into the optical path to change the polarization state of the femtosecond laser, the resulting polarization laser irradiates vertically onto the surface of tungsten metal to produce striped structure. The generation mechanism of the fringes and the influence of laser polarization on the structure are also studied. It is found that there is a good agreement between the femtosecond laser with different polarization states and the corresponding induced fringe structure. When the 1 ~ 4 wave plate rotates periodically in one direction, the polarization state of the laser varies periodically, and the direction of the striped structure formed on the metal surface also changes accordingly. The maximum deflection angle is about 蟺 / 4. The mechanism of the variation of the fringe direction with the rotation of the wave plate is analyzed theoretically. The results show that the direction of the fringes produced by femtosecond laser induced by different polarization states is determined by the electric vector components decomposed after the laser enters a birefringent crystal (for example, a 4-wave plate).
【作者单位】：中国科学院长春光学精密机械与物理研究所;
【分类号】：TG665

【共引文献】