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基于复合波片消色差设计方法,结合矢量光场衍射受限的大数值孔径聚焦理论,以600 nm为中心波长,提出了一种适用于宽波带的全晶体型光瞳滤波器。该滤波器由三片具有同心分区环带的复合延迟波片构成,每分区波片具有各自的方位角及环带参数,且相邻环带光轴垂直。在轴对称偏振矢量光场入射下,通过调节光瞳滤波器的方位角,经聚焦后,在550~650 nm波长范围内,均可获得轴向焦深的扩展、横向压缩的光针场以及衍射受限的三维光管场。研究结果表明,该光瞳滤波器在100 nm波段内实现了宽波带矢量光场的调控。
Based on the achromatic design method of composite wave plate and the large numerical aperture focusing theory of diffraction limited by the vectorial light field, a full-crystal type pupil filter suitable for a wide wavelength band is proposed. The filter consists of three composite retardation plates with concentric zone rings. Each zone plate has its own azimuth and annulus parameters with the optical axis of the adjacent annulus perpendicular. By adjusting the azimuth angle of the pupil filter and adjusting the azimuth angle of the pupil filter under the incident light field of the axisymmetric polarization vector, the axial depth of focus expansion, transversely compressed light needle field and Diffraction limited 3D light pipe field. The results show that the pupil filter can control the light field in a wide band with a wavelength of 100 nm.