7.4.1.2. Generation of a Bessel beam with a lens and an annular slit.

By positioning an aperture around the disk a non-difracting Bessel beam is generated over a distance given by the ‘overlap area’. From geometric optics this distance can be estimated by:

\(z_{max}=\frac{Df}{a}\), where \(D\) and \(f\) are the diameter and focallength of the lens respectively.

(Source code, png, hires.png, pdf)

_images/BesselAnnularSlit3_00_00.png

(png, hires.png, pdf)

_images/BesselAnnularSlit3_01_00.png