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Plano-Convex (PCX) Axicons

Plano-Convex (PCX) Axicons

Plano-Convex (PCX) Axicons


  • Creates a Ring Shaped Approximation of a Bessel Beam
  • Available Uncoated or Anti-Reflection Coated
  • Offered in a Variety of Apex Angles

Plano-Convex (PCX) Axicons feature one conical surface and one plano surface. They are used to produce a non-diffractive ring-shaped beam that increases in diameter over distance while retaining a constant ring thickness. When used with a collimated Gaussian beam, Plano-Convex (PCX) Axicons create an approximation of a Bessel beam ideal for a range of medical, research, measurement, and alignment applications. They feature a precision fused silica substrate and are available uncoated and with a wide selection of anti-reflection (AR) coating options.

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

A Bessel beam is a non-diffractive beam comprised of rings equal in power to one another. Although Bessel beams are only theoretically possible because they require an infinite amount of energy, the output of Plano-Convex (PCX) Axicons offer a good approximation by maintaining a high level of the non-diffractive Bessel beam properties.

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

The diameter of the ring (dr) is defined using the length from lens output to image (L), the index of refraction of the lens material (n), and the angle a:

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.

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