Freeform Optics

Custom Freeform Optics Design and Manufacturing

Avantier specializes in freeform optics and free‑form optics solutions that push the limits of optical performance while reducing system size and complexity. Our custom freeform optics design and manufacturing services support imaging, sensing, and laser systems in industry, defense, research, and medicine, from one‑off prototypes to high‑volume production.

For broader context on our advanced custom optics capabilities, visit our Custom Optics Hub.

Specifications:
Material: Aluminium
Size: 40 x 30 x ET 8mm
EFL: 20mm
Off-Axis Angle: 0°
Coating File: Silver

Specifications:
Material: Copper
Size: D50.8 x ET7mm
EFL: 101.6mm
Off-Axis Angle: 90°
Coating File: Silver

Specifications:
Material: Aluminium
Size: 25 x 15 x ET 10mm
EFL: 17.04mm
Off-Axis Angle: 80°
Coating File: Silver

What Are Freeform Optics?

Freeform optics are optical components with at least one surface that lacks translational or rotational symmetry about any axis normal to the mean plane. This means freeform optical surfaces are not constrained to spherical or rotationally symmetric shapes, giving designers far more degrees of freedom than traditional lenses and mirrors.

These freeform optics are typically described by XY polynomials or spline‑based surfaces and are used to correct aberrations, fold optical paths, and enable compact, high‑performance systems that would be difficult or impossible with only spherical or aspheric elements.

Materials and Representative Free-Form Optics

Avantier fabricates freeform optics in metals, plastics, and a broad range of infrared and visible materials, including aluminium, copper, germanium (Ge), calcium fluoride (CaF₂), magnesium fluoride (MgF₂), zinc selenide (ZnSe), zinc sulfide (ZnS), gallium arsenide (GaAs), and silicon (Si).

Representative examples of custom free‑form optics include:

Aluminium freeform optics with compact footprints and short effective focal lengths for lightweight imaging systems.
Copper freeform mirrors with longer focal lengths and large off‑axis angles for beam steering and high‑power laser delivery.

For IR‑optimized materials, see our Zinc Selenide Optics page for additional substrate capabilities.

Benefits of Freeform Optics

Freeform optics are often the optic of choice when designers need performance beyond what spherical and conventional aspheric elements can provide. They can simultaneously correct multiple aberrations, fold optical paths, and reduce part count in complex imaging systems.

Key advantages include:

Advanced beam shaping and wavefront control in both imaging and illumination systems.
Fewer optical elements in assemblies, which can lower mass, reduce size, and simplify alignment.
Smaller, lighter, and more compact optical systems ideal for head‑mounted displays, airborne platforms, and portable medical devices.

How Freeform Optics Are Manufactured

Because freeform optics lack rotational symmetry and are not referenced to a simple base sphere, traditional grinding and polishing methods are not sufficient. Avantier relies on state‑of‑the‑art CNC optical grinding and ultraprecise single‑point diamond turning to shape freeform surfaces directly from the design model.

A typical freeform optics manufacturing workflow includes:

Rough shaping of the freeform surface from an optical blank using CNC‑integrated grinding and diamond turning based on CAM‑defined surface data.
Iterative rough and fine grinding with CNC‑controlled tools, combined with frequent profile measurements to identify and correct shaping errors.
Sub‑aperture polishing tailored to complex freeform geometries, followed by multiple metrology checks using surface profilers, interferometers, and computer‑generated holograms to ensure the optic meets specification.

Depending on the substrate, some free‑form optics are also produced via precision molding and then refined with CNC polishing, especially for metal and plastic freeform lenses and mirrors in higher volume applications.

Learn more about how we verify freeform optics with advanced Optical Metrology Services.

Custom Freeform Optics Design & Manufacturing Solutions

Avantier’s optical engineers and designers have extensive experience in freeform optics design, tolerancing, and integration into real‑world imaging and beam‑delivery systems. The team can start from a full freeform optical design, an initial concept, or a list of performance requirements and then co‑develop a manufacturable freeform solution.

Services include:

Freeform optics design and optimization for imaging, illumination, and laser applications.
Prototype‑to‑production scaling for free‑form optics in industrial, defense, medical, and research programs.
Close collaboration on opto‑mechanical integration, alignment strategies, and coating choices tailored to each freeform optic.

Avantier provides end‑to‑end freeform optics and free‑form optics solutions, combining design expertise, advanced CNC manufacturing, precision molding, and rigorous metrology to deliver high‑performance custom components. Whether you need a single prototype or a volume production run of freeform optics for imaging, sensing, or laser systems, the team is ready to support your project.

Contact Avantier today to discuss your freeform optics requirements, request a quote, or schedule an introductory consultation to start the design process.