Jaroszewicz Z, Dopazo J F, Gomez-Reino C
Appl Opt. 1996 Mar 1;35(7):1025-31. doi: 10.1364/AO.35.001025.
The axial intensity of axicons illuminated by a coherent wave usually exhibits rapid oscillations from diffraction on the sharp edges of the aperture of the element. These oscillations can be suppressed when the diffractive version of the axicon is illuminated from a polychromatic source. This possibility is examined based on the example of the annular-aperture logarithmic axicon. The estimate for the wavelength interval of the illuminating source required for uniformization is obtained with the help of the stationary-phase method. Furthermore the shape of the radial intensity distribution can be maintained almost unchanged. These findings are confirmed by numerical evaluation of the Fresnel diffraction integral.
由相干波照射的轴棱锥的轴向强度通常会因元件孔径尖锐边缘上的衍射而呈现快速振荡。当从多色光源照射轴棱锥的衍射版本时，这些振荡可以被抑制。基于环形孔径对数轴棱锥的例子来研究这种可能性。借助稳相法获得了实现均匀化所需的照明源波长间隔的估计值。此外，径向强度分布的形状几乎可以保持不变。这些发现通过菲涅耳衍射积分的数值评估得到了证实。
