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
)