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How can you determine the diameter and ring thickness of the beam created with a Plano-Convex (PCX) Axicon Lens?

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) Axicon Lenses 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): Bessel Beam Ring Thickness Equation

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: Bessel Beam Ring Diameter Equation

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