23 Apr 2009 Axicon lens a conical lens which, when followed by a conventional lens, can focus laser light to a ring shape.
Both types - Plano convex and Plano concave axicons available! Axicon can be used to convert a parallel laser beam into a ring, to create a non diffractive Bessel beam or to focus a parallel beam into long focus depth.
The term axicon was coined in 1954 by John McLeod to describe his newly invented optical element, which produced a line focus. He explored various methods to diffract light so that it converged linearly on the optical axis, but the best-known system was a refractive element with a planar and a conical surface. This element produced an extended focus, which began at the back surface. |
