Axicon

• Transforms light into a line focus or Bessel beam
• Creates non-diffracting beams that maintain shape over long distances
• Apex angle affects ring spread and diameter
• Enhances depth of field in Optical Coherence Tomography (OCT)
• Improves OCT imaging by extending focus without sacrificing resolution

Axicon

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  • Apex Angle of the Axicon

    Effect: The apex angle (or cone angle) of the axicon is one of the most critical parameters. A smaller apex angle (i.e., a sharper cone) will cause the rings to spread out more slowly and result in a narrower ring diameter. Conversely, a larger apex angle (i.e., a flatter cone) will cause the rings to spread out faster, resulting in a wider ring diameter.

  • How Axicons Are Used in Optical Coherence Tomography (OCT)

    Optical Coherence Tomography (OCT) is a non-invasive imaging technique that uses light waves to capture detailed, cross-sectional images of biological tissues, such as the retina in the eye or layers of skin. One of the challenges in OCT is maintaining a good depth of field (the range over which the image remains in focus) while still achieving high resolution. This is where axicons come into play.
    An axicon is a specialized cone-shaped lens that focuses light into a line rather than a single point, which extends the depth of focus. When used in OCT systems, axicons help improve the imaging process by extending the depth of focus without sacrificing resolution.

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