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Axicon (Conical Lens)

Featured Product from Hangzhou Shalom Electro-optics Technology Co., Ltd.

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Features:

  • Creating an approximation of a diffraction-free Bessel beam or  converting laser light into an annular shape
  • Made of high-quality UV Fused Silica
  • High-precision polished
  • Superior performance for high-power lasers
  • Base angles available from 0.5°to  40°

 

An Axicon or a Conical Lens is an optical lens with a conical side and flat side, it is defined by its base angles and its apex angle. 

The working principle of an axicon is that it uses interference to create a focal line along the optical axis. Axicons could be utilized to generate an approximation of a diffraction-free Bessel beam, which is a beam consisting of a series of concentric rings having equal power through transforming collimated Gaussian beam in the near field. Although a Bessel beam does not exist in real life because it would require infinite energy to create, axicons offer a good analog by maintaining the non-diffractive Bessel beam properties over a distance much longer than a similar Gaussian beam. Bessel beams can be applied in atom or molecule guiding, optical trapping, and medical treatments. A plano-convex axicon could also be used to convert laser light into an annular shape by taking the projection in the far field, and the ring’s thickness will be 1/2 of the incident laser beam’s diameter. This trait grants axicons aptness for laser hole drilling, microscopes, and medical applications. Note that when converting a collimated light beam into a ring, the plano surface of the axicon should face the input light source.

Hangzhou Shalom EO offers Custom Axicons (Conical Lenses). The axicons are in plano-convex shape, made of high-quality UV Fused Silica, and are high-precision polished, featuring superior performance excellent for high-power lasers. The base angles of the axicons range from 0.5°to  40°.

 

Application Notes: the manner that the axicon deflects light could be described by Snell's Law, which can be utilized to calculate the deflection angle: n*sin(a)=sin(a+b), where n is the refractive index of the glass, a is the physical angle of the prism, and b is the angle the deflected beam between the optical axis. and note that the refractive index of air is presumed to be 1.