Zalvidea D, Sicre E E
Centro de Investigaciones Opticas (CIOp), P.O. Box 124, (1900) La Plata, Argentina.
Appl Opt. 1998 Jun 10;37(17):3623-7. doi: 10.1364/ao.37.003623.
A method for obtaining phase-retardation functions, which give rise to an increase of the image focal depth, is proposed. To this end, the Wigner distribution function corresponding to a specific aperture that has an associated small depth of focus in image space is conveniently sheared in the phase-space domain to generate a new Wigner distribution function. From this new function a more uniform on-axis image irradiance can be accomplished. This approach is illustrated by comparison of the imaging performance of both the derived phase function and a previously reported logarithmic phase distribution.
提出了一种获取相位延迟函数的方法，该方法可增加图像焦深。为此，在相空间域中对与在图像空间中具有相关小焦深的特定孔径相对应的维格纳分布函数进行方便的剪切，以生成新的维格纳分布函数。从这个新函数可以实现更均匀的轴上图像辐照度。通过比较导出的相位函数和先前报道的对数相位分布的成像性能来说明这种方法。
