从单个锥形折射光束产生三维暗焦点
Generating a three dimensional dark focus from a single conically refracted light beam
摘要：
我们在这里报告的生成一个三维的暗焦点从一个单一的聚焦单色高斯光束，经过锥形折射时，它沿着一个双轴晶体的光轴传播。我们研究了晶体后面的环强度图案作为环半径和束腰之间的比率的函数，并推导出特定的参数值，对于该参数值，在环中心处形成具有零强度的三维暗焦点。我们已经进行了实验与${\rm KGd(WO_4)_2}$双轴晶体报告的产生与我们的理论研究完全一致的瓶束。
英文摘要：
We report here the generation of a three dimensional dark focus from a single focused monochromatic Gaussian beam that undergoes conical refraction when it propagates along one of the optic axes of a biaxial crystal. We study the resulting ring intensity pattern behind the crystal as a function of the ratio between the ring radius and the beam waist and derive the particular parameter values for which a three dimensional dark focus with null intensity at the ring center is formed. We have performed experiments with a ${\rm KGd(WO_4)_2}$ biaxial crystal reporting the generation of a bottle beam in full agreement with our theoretical investigations.
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