用线偏振光产生可调矢量椭圆空心光束

摘要

A new scheme for generating a vector hollow beam is proposed by usingπphase plates, in which two linearly polarized light beams with perpendicular polarizations pass through twoπphase plates respectively, and then an elliptical hollow beam is generated by the superposition of two diffracted waves. The eccentricity of the ellipse can be adjusted by varying the geometric size of phase plates with rectangular diaphragm. And the conversion from the radial vector beam into the angular vector beam can be realized by adjusting directions of phase plates. The feasibility and potential applications in atom optics are analysed and discussed showing that our scheme has a good potential application in atom optics.%提出了利用π相位板产生矢量空心光束的新方案，两个偏振方向互相垂直的线偏振光波分别通过π相位板调制后进行强度叠加，得到椭圆空心光束。用矩形光阑调节相位板的几何尺寸，可以实时调节椭圆的离心率；调节π相位板的方位，能够实现径向矢量空心光束到角向矢量空心光束的转换。分析、讨论了方案的可行性和在原子光学中的潜在应用。结果表明：本方案在原子光学中有很好的应用前景。