Augmented reality (AR) glasses ask a lot from a very small optical system. Digital content needs to appear bright, clear, and stable while the wearer still sees the physical world clearly. At the same time, the glasses need to become lighter, thinner, more comfortable, and easier to manufacture consistently.
For us, waveguide development starts with understanding how those priorities fit together. A waveguide has to direct light with exceptional precision, but there is no single specification that defines success. The choices we make in optical design have to hold up through manufacturing, measurement, alignment, and calibration if they are going to deliver the experience a partner is working toward.
Start With the Right Priorities
Every waveguide project begins with a different set of goals. Field-of-view may be a major priority for one design, while another may put more emphasis on efficiency, transparency, eyebox, color uniformity, or a particular form factor. Understanding those priorities early helps define which optical tradeoffs are worth making and which are not.
That matters because waveguide performance is interconnected. Changing one part of the design can create consequences elsewhere, so simply pushing an individual metric higher does not necessarily create a better optic. The more useful question is: What combination of characteristics best supports the intended application?
Our experience across different waveguide architectures and design constraints gives us a wider set of options to explore with partners. Instead of approaching every project with the same solution, we can use those requirements to guide the design from the beginning.
SRGs Give Us Room to Tune
Once those priorities are clear, surface relief gratings (SRGs) give us a powerful set of tools for shaping waveguide performance. Their nanoscale geometry can be adjusted to influence how light is distributed through the optic and how the resulting image behaves across the viewing area.
The important part is not simply that SRGs can be designed in many different ways. It is knowing which design choices are useful for the problem we are trying to solve. A change that supports brightness, for example, has to be considered alongside uniformity, color fidelity, field-of-view, and the other requirements established for the waveguide.
That flexibility is one of the reasons we continue to invest deeply in SRG design. It allows us to explore different approaches rather than forcing partner requirements into a fixed optical architecture. Just as importantly, our experience making and testing those designs gives us practical information about which concepts are likely to remain robust as they move beyond the design environment.
The Design Has to Survive Fabrication
Designing a high-performing waveguide is only part of the challenge. We also have to be able to make it reliably.
For us, the real test of a design is whether its optical intent can be preserved when it becomes a physical waveguide. SRGs contain nanoscale features, and small changes introduced through materials, pattern transfer, coatings, or other fabrication steps can affect how the finished optic performs.
That makes waveguide manufacturing part of the design conversation from the beginning. Experience with fabrication helps us recognize where a design may be especially sensitive to variation, where tolerances deserve closer attention, and where an adjustment could make the process more repeatable without losing the performance we are trying to achieve.
The benefit is a tighter connection between what we intend to make and what we are actually able to measure in the finished optic. Instead of treating design and manufacturing as separate stages, we can use what we learn during fabrication to make better optical decisions and improve consistency from one waveguide to the next.
Measurement Changes the Next Decision
Once a waveguide is fabricated, we want to know how closely the physical optic matches the behavior we intended.
But for us, measurement is most valuable when it does more than tell us whether a part passed or failed. Metrology gives us another source of information about the design itself. It can show us where actual optical behavior differs from our expectations and help us connect those differences back to physical features or manufacturing conditions.
That feedback can change what we do next. It may point us toward a grating adjustment, highlight a process that needs tighter control, or show that a particular design is more sensitive to variation than expected. Across repeated fabrication and testing, those observations build a clearer picture of which decisions consistently produce the performance we want.
Metrology automation strengthens that process by giving us repeatable information across multiple waveguides. The goal is not simply to collect more measurements. It is to turn those measurements into better design and manufacturing decisions.
Designing With Integration in Mind
What we learn does not stop once the waveguide leaves fabrication. Our experience with optical alignment and calibration also informs how we think about the waveguide earlier in development.
Knowing that an optic will eventually need to be positioned, aligned, and calibrated makes tolerances more than numbers on a specification sheet. It helps us think about how sensitive a design may be to small variations, which characteristics need especially tight control, and where later calibration can or cannot compensate for differences.
This is the broader perspective we bring to partner work. We are not looking at the waveguide as an isolated optical component or assuming that strong performance in one phase of development guarantees strong performance later. Our experience across design, manufacturing, metrology, alignment, and calibration helps us ask better questions earlier and understand how waveguide decisions carry forward.
For consumer AR, that continuity matters. High-performing waveguides come from making thoughtful choices throughout development and understanding how those choices affect what follows. By bringing those perspectives together, we can help partners turn ambitious optical requirements into waveguide designs that are precise, manufacturable, and grounded in practical experience.
Learn more about how our waveguide design and manufacturing expertise can help move your next AR project forward.