Plano-Convex (PCX) Ring Grade Axicons

Plano-Convex (PCX) Ring Grade Axicons are used in generating ring profile laser beams and are available in several different Apex Angles from 90° to 160°. They feature controlled apex angle tolerances that create precise ring profiles. Plano-Convex (PCX) Ring Grade Axicons utilize a precision fused silica substrate and can be purchased with a broadband anti-reflection coating or as uncoated substrates. For axicons used to create diffraction-free Bessel Beams, Plano-Convex (PCX) Bessel Grade Axicons are available.

Note: For more information on axicons, please review our application note: An In-Depth Look at Axicons.

The ring thickness (t) is easily defined by taking ½ of the beam diameter (d_b):

The diameter of the ring (d_r) is defined using the length from lens output to image (L), the index of refraction of the lens material (n), and the angle (a) and can be approximated as follows:

For optimum performance, we recommend using Plano-Convex (PCX) Axicons in conjunction with one of our beam expanders in order to ensure a beam diameter of at least 50% of the clear aperture.