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提出利用电控径向双折射光瞳滤波器实现横向超分辨性能参量的调制与轴向扩展焦深。该光瞳滤波器由两个平行偏光镜,一个电光晶体与一个径向对称双折射晶体组成。分析了电光晶体与径向双折射元件对光偏振态的空间调制作用,通过控制电光晶体的相位延迟实现径向中心处初始偏振态的控制,与径向双折射元件横向偏振态调制结合,实现了庞加莱球上偏振态演变路径与阶段的控制,从而对焦点附近偏振态进行空间调制以实现光强的重新分布。研究结果表明,外加电场调制可以实现横向上超分辨性能的调控以及轴向上焦深的扩展,并可得到相应的电光相位延迟范围。
The application of electronically controlled radial birefringence pupil filter is proposed to modulate the horizontal super-resolution performance parameters and extend the axial depth of focus. The pupil filter consists of two parallel polarizers, one electro-optic crystal and one radial symmetric birefringent crystal. The spatial modulation of the polarization state of the electro-optic crystal and the radial birefringent element is analyzed. By controlling the phase delay of the electro-optic crystal, the initial polarization state at the radial center is controlled and combined with the lateral polarization state modulation of the radial birefringent element. The control of polarization path and phase in Poincaré sphere is made, and the polarization state in the vicinity of the focal point is spatially modulated to achieve redistribution of light intensity. The results show that the applied electric field modulation can achieve lateral super-resolution performance control and axial depth of focus expansion, and the corresponding electro-optical phase delay range can be obtained.