A reflective axicon, also known as a reflaxicon, does not have the geometry of a traditional axicon. Rather, it consists of a pair of coaxial conical reflective surfaces. Designed to manipulate light in much the same manner of a transmissive axicon, it has several features that make it the best choice in some situations: a high damage threshold, low chromatic aberration, and better group velocity dispersion.

Axiconlens

Room 609, 6/F, Global Gateway Tower, No.63 Wing Hong Street, Cheung Sha Wan, Kowloon, Hong Kong +852-54993705 info@shanghai-optics.com

Axiconbarcode verifier

The Illuminated Handheld Magnifier from Carson is a 7x Aspheric magnifier. Aspheric lens magnifiers allow for increased magnification and image clarity while greatly reducing edge to edge distortion. Its 1.5 in. crystal-clear acrylic lens allows it to be lightweight enough to use for everyday tasks.

Axiconapp

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The TriView 5x/10x/15x Folding Loupe with Built-in Case is a compact, portable folding loupe magnifier with power ranging from 5x-15x power magnification. Each lens contains 5x power magnification. Combine two lenses together to make 10x power magnification or three to make 15x power.

At Shanghai Optics we produce high-precision axicon lenses for medical, scientific and industrial applications. From eye surgery to optical tweezers to laser drilling, from optical coherence tomography to particle physics, these prisms play a very important role in a wide range of optical systems.

To convert a collimated beam of light into a ring, one places the axicon lens with the flat side facing the collimated beam. Light enters at a perpendicular angle, in the center of this flat side, then travels along the axions optical axis and and leaves the lens as a cone of light. When projected onto a planar surface this light can be seen to be a ring. The closer the surface, the smaller the diameter of the ring.

Axiconmeaning

An axicon lens is a special lens with one plano (flat) surface and one conical surface. Also known as a rotationally symmetric prism, an axicon lens creates a focal line along the optical axis using interference, and can convert a laser beam into a ring shaped beam of light. Axicons are typically defined by their apex angles.

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The ergonomic SureGrip™ handle adds comfort while in handheld use, or easily transition to hands-free use by extending the metal drop-down legs.

At Shanghai Optics we produce a variety of axicon lenses from optical materials such as fused silica, sapphire, ZnSe, and plastics. Our lenses can be made with almost any ring diameter, and both refractive and diffractive axicon lenses are available. We can also design optical assemblies such as a combination of axicons with beam expanders, lenses, or additional axions to produce your desired beam profile.

While a Gaussian beam would deteriorate over distance, the beam profile produced by an axicon begins by nearly propagating the properties of a Bessel beam which maintains a stable intensity distribution as it propagates. In fact, it generates a very good approximation within its depth of focus, which can be calculated from the radius of the beam entering the axicon, the index of refraction of the axicon, and the angle α.  If the angle of refraction is small, this can be approximated by radius/ (index of refraction-1) α.

One application of axicons is in what is called optical trapping. This technique involves creating attractive and repulsive forces by means of a laser, then using these forces to mover or trap very small particles (micro particles) and, on occasion, cells. An axicon lens, forming a Bessel beam within the DOF (depth of focus, the beam overlap region), can effectively trap a particle on a flat surface such as a microscope slide.

Alpha Industrial Park, Tu Thon Village, Ly Thuong Kiet Commune, Yen My District, Hung Yen Province Vietnam 17721 +84 221-730-8668 rfqvn@shanghai-optics.com

Eisco Labs gowland type plano-convex lens made of extra white glass. Features an unbreakable plastic lens holder and an anodized aluminum cover. Ideal for precise optical applications.

Axicontablets

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

Axicon lenses are also used for optical surgery, enabling the surgeon to focus in on an area of interest and to smooth tissue where necessary. For ultimate adjustability of ring diameter a combination of positive and negative axions are often used for this application.