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.

Understanding Axicon Lenses

To turn a collimated beam into a ring shape, you need to face the flat side of the axicon lens toward the incoming beam. When the beam hits the center of this flat surface straight on, the light travels along the optical axis of the axicon and then exits the lens in a cone shape. Once this conical beam hits a flat surface, it forms a ring of light. The closer the surface is to the lens, the smaller the diameter of the ring.

Unlike a Gaussian beam, which fades as it travels, the beam shape created by an axicon behaves more like a Bessel beam — meaning it keeps a steady intensity profile over a longer range. In fact, within a certain depth of focus, an axicon can create a beam that closely approximates a true Bessel beam. This depth of focus depends on the incoming beam’s radius, the refractive index of the axicon, and the angle α. If the angle is small, you can roughly estimate the depth of focus with the formula: radius / [(refractive index - 1) × α].

Beyond this focused region, the axicon still generates a clean, uniform ring-shaped beam.

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.

Product parameter

Axicon Lens Manufacturer

At Hongsheng Optoelectronics we are committed to delivering cutting-edge optical solutions that meet the highest standards of quality and precision. 

Expertise in Precision Optics: With years of experience in the development, production, and assembly of optical components, including cylindrical lenses, spherical mirrors, prisms, and infrared crystals, we bring unparalleled expertise to every project.

Innovative Technology: We integrate the latest optical technology with a focus on continuous innovation, ensuring that our products are not only precise but also ahead of industry trends.

Custom Solutions: We understand that every project is unique. Our team offers fully customized optical lenses and components tailored to your specific needs, ensuring optimal performance for your applications.

Reliable Quality: We pride ourselves on maintaining strict quality control throughout the production process, guaranteeing that every lens and optical component meets the highest standards of durability and accuracy.

Timely Delivery: With a streamlined manufacturing process and efficient logistics, we ensure that your orders are delivered on time, every time—no matter how large or small the order.

Comprehensive Support: From technical consulting to after-sales support, we are dedicated to providing our clients with a seamless experience, guiding them through every step of their project.