There is a potential need for large (>500 mm diameter) conformal windows for use on air, space, and watercraft

Freeform surfaces on optical components have become an important design tool for optical designers. Non-rotationally symmetric optical surfaces have made solving complex optical problems easier. The manufacturing and testing of these surfaces has been the technical hurdle in freeform optic’s wide-spread use

Freeform applications are expanding and include helmet-mounted displays, conformal optics, and those requiring the extreme precision of EUV. We will discuss the total manufacturing process and highlight the capabilities available today

We will present a case study of a characteristic freeform production optic that required an absolute positioning measurement procedure utilizing a custom dual computer generated hologram (CGH) interferogram set-up

Freeform optical systems are becoming increasingly common due to new design and manufacturing methods. We present an example compact freeform optical system and describe considerations for transfer of the prescription of freeform surfaces for fabrication

Monolithic multi-surface telescopes combined with freeform optical surfaces provide improvements in optical performance in a smaller footprint as compared to systems with spherical surfaces, while providing superior mechanical stability to traditional telescope assemblies

With optical technology and design advances, larger freeform optics are increasingly sought after by consumers for an expanding number of applications. This paper will present some of the challenges and solutions of extending freeform polishing capabilities from approximately 150 mm diameter parts to a component of over 500 mm in diameter

This paper will address challenges that have been encountered in the manufacturing, testing, and handling of freeforms as their size expands up to and beyond 500 mm, and provide future work that will address each challenge

This paper will discuss challenges faced as a result of scaling up our freeform polishing process from parts with approximately 150 mm diameters, to polishing components with diameters over 600 mm

Several challenges associated with part size and shape complexity were solved during the manufacture of the largest extreme freeform shape Optimax has fabricated to date

Freeform optics have emerged as a new tool for optical designers and integrators. Manufacturing innovations are gradually increasing availability of precision freeform optics.

The top five common freeforms have gained popularity with lens designers and optical system interrogators. 

Optical systems must perform under environmental conditions including thermal and mechanical loading. To predict the performance in the field, an integrated analysis combining optical and mechanical software is required to understand optical performance. 

Freeform optical shapes or optical surfaces that are designed with non-symmetric features are gaining popularity. This enabling technology allows for conformal sensor windows and domes that provide enhanced aerodynamic properties

Conformal windows pose new and unique challenges to manufacturing due to the shape, measurement of, and requested hard polycrystalline materials. Optimax has developed a process for manufacturing conformal windows out of fused silica, glass, zinc-sulfide multispectral, and spinel. 

Freeform optical surfaces are gaining popularity with lens designers and optical system integrators as a method to solve complex optical system design problems. Fortunately, advances in optical manufacturing have opened the possibility for designers to manufacture these complex surfaces

Freeform optical shapes that are designed with non-symmetric features allow for conformal sensor windows and domes that provide enhanced aerodynamic properties as well as environmental and ballistic protection

Freeform and conformal optics have the potential to dramatically improve optical systems by enabling systems with fewer
optical components, reduced aberrations, and improved aerodynamic performance

For more than 100 years, optical imaging systems were limited to rotationally symmetric lens elements, due to limitations in processing optics. However, the present application of CNC machines has made the fabrication of non-rotationally symmetric lenses, such as freeform surfaces, economical

Freeform optical shapes or optical surfaces that are designed with non-symmetric features are gaining popularity with lens
designers and optical system integrators. Tolerances on a freeform optical design influence the optical fabrication process

Freeform surfaces typically have little to no symmetry, making the alignment of the surfaces difficult. Fiducials are required to achieve higher accuracy measurements of freeform optical surfaces

Freeform optical surfaces, which have little to no symmetry, are gaining popularity with lens designers and optical system integrators. Using fiducials properly leads to higher accuracy measurements and allows more control of the surface throughout the manufacturing process

Our robotic polishing platforms are able to polish large, difficult-to-make optical surfaces with minimal surface error. 

Proper metrology is required to monitor and verify the freeform fabrication processes to improve capability and precision

The freeform monolithic multi-surface telescope design has all its off-axis optical surfaces manufactured from a single optical blank, resulting in truly monolithic telescope design, providing improvements in stability and payload. 

Optimax has developed a variety of new deterministic freeform manufacturing processes by combining traditional optical fabrication techniques with cutting edge technological innovations

The addition of VIBE smoothing as the final optical fabrication process yields highly smooth surfaces on polycrystalline aspheres, improving optical performance. 

Freeform optical shapes or optical surfaces that are designed with non-symmetric features are gaining popularity with lens designers and optical system integrators. A common question about freeform optics is, “If I design it, can you really make it?”