最后，本文提出了高阶级联滤波器的纵向扩展设计思路。

Finally, the longitudinal expansion thought of high-order cascade filter design was presented.

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模拟结果表明，这种新型滤波器不仅可以提高高数值孔径物镜的纵向分辨率，同时基本上不影响横向分辨率。

Numerical results show that this new kind of pupil filters can realize not only axial superresolution, but also not influence transverse resolution.

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针对采用有限大小探测器的共焦显微系统，利用两区相位型滤波器提高系统的纵向分辨率。

For a confocal microscope with a finite-sized detector, the improvement in axial resolution by a phase-only filter with two zones was experimentally investigated.

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