Axicon Lens

Axicon Lens

Axicon lenses use interference to form a focal line along the optical axis and can transform a laser beam into a ring-shaped beam. Axicon lenses are mainly used as beam shapers for laser applications.

How Axicon Lenses Work

An axicon lens, also known as a conical or rotationally symmetric prism lens, has a conical surface that refracts light differently from a standard spherical lens. When a collimated light beam passes through an axicon lens, it is transformed into a non-diffractive Bessel beam, creating a focal line rather than a focal point. This unique property is due to the conical shape, which directs light rays along a continuous path, ideal for applications requiring long-depth focus, such as laser drilling, optical trapping, and medical imaging.

Application

Axicons form Bessel beams within the DOF (depth of field, area of beam overlap) and can effectively trap particles on flat surfaces, such as microscope slides.

Axicons are also used in optical surgery, allowing surgeons to focus on areas of interest and smooth tissue if necessary. To maximize the adjustment of the ring diameter, a combination of positive and negative axicons is often used in this application.

In telescopes, lenses are used as solar concentrators, focusing light from the sun. In optical coherence tomography (OCT), lenses are used for laser drilling and optical drilling.

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