Customized Axicon Lens

Axicon lenses

What is Axicon Lenses

Axicon lenses, also called conical lenses or rotationally symmetric prism, is defined by its apex angle, have a conical and a flat surface. They’re used to create Bessel intensity or non-diverging cone-shaped beams. When transforming a collimated beam into a ring, position the flat side toward the beam. Axicon lenses are ideal for laser drilling, producing diffract-free concentric Bessel beams. They come with precise angles (0.5-40 degrees) and are often crafted from UV fused silica, perfect for high-power laser applications.

Axicon lenses have diverse applications in areas such as laser material processing, optical trapping, microscopy, and interferometry, where the generation of ring-shaped or Bessel beams is required.

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Customize Your Axicon Lenses

There are several types of axicon lenses based on their specific applications: Plano-Convex Axicon, Plano-Concave Axicon,Double-Convex Axicon, Double-Concave Axicon, Fresnel Axicon, Blazed Axicon etc. Depending on the specific requirements of an application, custom axicons with unique cone angles and surface profiles can be designed and manufactured.

Specifications for
Customized Plano-concave Axicons

Type Plano-convex
Substrate material H-K9L, JGS1, BK7, UVFS, etc.
Clear aperture >90%
Diameter Up to 400mm
Diameter tolerance +/- 0.05 mm
Thickness Tolerance +/-0.05mm
Apex rounding Regular: <⌀1 mm
Advanced: <⌀0,4 mm
Angle tolerance Regular: ±0,5°
Advanced: ±0,1°
Surface Deviation (RMS) <0.05μm(S1)
Coatings As per requested
Surface quality 60-40 Scratch-Dig
40-20 Scratch-Dig
Surface irregularity λ/10@633nm / λ/4@632nm
Coatings Uncoated / Broadband AR coated
( Ravg = < 0.5% @ 400 – 700 nm )

Specifications for
Customized Plano-concave Axicons

Type Plano-concave
Substrate material H-K9L, JGS1, BK7, UVFS, etc.
Clear aperture >90%
Diameter Up to 400mm
Diameter tolerance +/- 0.05 mm
Thickness Tolerance +/-0.05mm
Apex rounding N/A
Angle tolerance Regular: ±0,5
Surface Deviation (RMS) <0.05μm (S1)
Coatings As per requested
Surface quality 60-40 Scratch-Dig
40-20 Scratch-Dig
Surface irregularity λ/10@633nm / λ/4@632nm
Coatings Uncoated / Broadband AR coated
( Ravg = < 0.5% @ 400 – 700 nm )

Why Axicon lenses

A refractive axicon lens exhibits unique optical characteristics where the length and width of its focal line are determined by the prism angle and the refractive index of the material.

Unlike traditional converging lenses, such as plano-convex, double-convex, or aspheric lenses, which are designed to focus a light source onto a single point along the optical axis, the design of an axicon lens aims to converge the light source into a line composed of multiple discrete points distributed along the optical axis.

Why Axicon Lenses before and after

Axicon Uses in Scientific and Industrial Applications

Their unique optical properties make axicons valuable in these scientific and industrial applications. Such as 1) Optical Alignment: Precise beam shaping and alignment in optical systems. 2) Corneal Surgery: Used in LASIK for vision correction. 3) OCT Imaging: Extends depth of field for detailed biomedical imaging. 4) Atomic Traps: Trapping and manipulating cold atoms in quantum research.  5) Acoustic Testing: Shapes and focuses acoustic waves for testing. 6) Material Processing: Enables laser drilling and cutting with annular beams. 7) Nanolithography: Creates high-resolution patterns. Interferometry: Useful in studying wave interference.

why axicons lenses

Fabrication and Alignment of Axicon Lenses

The axicon lens manufacturing process involves key steps for precision and quality, which are axicon conical surface shaping, rapid Polishing to remove tool marks and enhance surface roughness, precision polishing to improve smoothness and shape accuracy and then fine tuning to refine the axicon lens surface. We qualitatively tested the fabricated Axicon by examining the beam profile within a collimated laser beam arrangement, and additionally utilized a stylus profilometer to measure the surface profile.

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Axicons and Their Uses

The vivid custom optics examples from which you can have a sense of what we are capable of. Such as:
— Bessel Beam Generation,
— Laser Material Processing,
— Optical Tweezers,
— Interferometry,
— Acoustic Testing,
— Optical Coherence Tomography,
— and more

APPLICATION

Bessel Beam Generation

Axicons are commonly used to generate Bessel beams. Bessel beams have a unique property of propagation, maintaining their intensity profile over long distances without spreading. They are used in various laser applications, such as optical tweezers, particle manipulation, and laser drilling.

Laser Material Processing

Axicons are utilized in laser material processing applications, including cutting, drilling, and engraving. They help focus laser beams into precise shapes and patterns, enhancing the precision of material removal or modification.

Optical Tweezers

Axicons are integral components of optical tweezers systems used for trapping and manipulating microscopic particles, cells, or biological specimens using laser light. They assist in creating stable traps and controlling particle positions.

Interferometry

In interferometric setups, axicons shape laser beams for use in optical interferometry techniques. They assist in creating interference patterns that are highly sensitive to minute changes in optical path length, enabling precise measurements of distances, wavelengths, and refractive indices.

Optical Coherence Tomography

Axicons are utilized in OCT systems for biomedical imaging. They help in generating focused beams with extended depth of field, allowing for detailed imaging of biological tissues, such as retinas and blood vessels.

Acoustic Testing

Axicons can also be used in acoustics. They help shape and focus acoustic waves for testing and measurement purposes. This application is useful in fields like non-destructive testing and ultrasound imaging.

Axicon Lenses Types At a Glance

Axicon lenses come in several types, which enable a wide range of applications in optics, laser technology, imaging, and more. Custom axicons can be designed with specific parameters, such as the cone angle, base diameter, and material etc.
Noni tailored to meet the requirements of specialized applications.

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Frequently Asked Questions about Axicons

Some important information you might want to know.

  • What are the different types of axicons?
    There are several types of axicon lenses based on their specific applications:
    • Plano-Convex Axicon: This type has one flat surface and one conical surface. It is often used for generating Bessel beams or ring-shaped intensity profiles.
    • Double-Convex Axicon: Both surfaces of this axicon are curved outward. It can be used for generating a Bessel beam or for non-linear optics applications.
    • Double-Concave Axicon: Both surfaces of this axicon are curved inward. It is sometimes used in conjunction with other optical elements to shape and manipulate light beams.
    • Fresnel Axicon: This type uses stepped or grooved surfaces to achieve the conical shape, making it lighter and more compact. It is often used in situations where space and weight constraints are critical.
    • Blazed Axicon: A blazed axicon has a specially designed conical surface with microstructures, which allows for precise control over the generated ring pattern. It is often used in applications where high precision is required.
    • Axicon Lens Arrays: These are arrays of axicon lenses arranged in a specific pattern. They find applications for creating multiple ring-shaped beams or for beam shaping purposes.
  • What is the function of the axicon?
    An axicon lens primarily serves to convert collimated light into a Bessel beam, featuring an elongated, non-diffractive focal line. This distinctive beam profile finds application in scenarios demanding extended depth of field, precise material manipulation, interferometry, and non-destructive testing. Axicons play a vital role in optical, laser, and medical applications, facilitating the shaping and precise focusing of light and electromagnetic waves.
  • Can you help to customize according to samples we offered?
    The shape of an axicon lens is conical. It typically consists of a conical surface that gradually tapers towards a point at one end and a flat surface at the other end. This conical geometry is a defining feature of axicon lenses and is responsible for their unique optical properties, such as the ability to generate Bessel beams and other non-diffractive beam profiles. The specific angle and dimensions of the conical surface may vary depending on the design and intended application of the axicon lens.

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