Optical Thin Film Engineering
Optical thin-film design and modelling software — from layer optimization to closed-loop production control.
We specialize in optical interference coatings — and we ship that experience as one product: EulenStudio. Its modules fit n, k, thickness and uniformity from your spectra, find the best design against spectral, colour and angle targets, compute tolerance and yield before the batch, close the loop between spectrometer and coater, and learn tooling factors and drift from your production history. The modules launch step by step — EulenControl is in production today. Alongside the product, we work as an engineering partner: simulation models, data analysis, AI production optimization and machine interfaces.
Based in Zug, Switzerland | Serving precision optics and high-tech industries worldwide
Our Software Solution: EulenStudio
One physics engine, one project — from the first measurement to the running line. EulenStudio launches in October 2026, the modules arrive step by step; EulenControl leads and is in production today. Developed in Switzerland, configured for your process.
EulenChar
Characterizes your materials and stacks.
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EulenDesign
Finds the stack for your specification.
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EulenModel
Tolerance and yield before the batch runs.
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EulenControl
Measures, computes and corrects live at the machine.
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EulenLearn
Learns from your production history.
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EulenCoat
Converts time-based data into batches.
More →Technological Advantage through State-of-the-Art Algorithms
Our software integrates seamlessly into any operation requiring reverse engineering of layer thicknesses from interference spectra. Thanks to advanced algorithms, we can optimize not only coating thickness but also material parameters and optical constants — delivering significantly more precise results than conventional software that only varies layer thickness.
For Machine Builders
You build coating machines; together we build the software that lets your customers measure, decide and correct. Because your customers can run the same software across machines from different builders, they get one consistent workflow for their whole fleet — backed by our experience making closed-loop control work reliably on optical coaters.
Our Services
The product is one half of what we do. The other half is engineering to order — on your data, your coatings and your machines.
Success Story
Setting a New Benchmark in AR Coating Measurement
The Challenge & Solution
Accurate optical measurement is essential for manufacturers of anti-reflective (AR) coatings on solar glass, as performance differences below 0.1% directly determine market competitiveness. However, traditional lab spectrometers often fail on textured surfaces because they scatter light strongly, introducing critical substitution errors.
Convsun (one of the world's leading AR coating producers) partnered with Eule27 AG to develop an integrated dual-detector measurement system. Convsun designed and built the hardware setup, while Eule27 developed all measurement procedures, data acquisition routines, and thin-film simulation models. Together, this collaboration closes the entire process control loop:
- Precision hardware measurement: Convsun's optimized integrating sphere setup with high-resolution Avantes AvaSpec-ULS2048XL+ spectrometers captures the full solar spectrum (380—1100 nm).
- Real-time optical simulation: Eule27's algorithms eliminate substitution errors on the integrating sphere setup mathematically and precisely calculate the true coating thickness and refractive index.
- Direct actionable output: The system doesn't just display lab data, it closes the industrial control loop and dictates exactly how deposition parameters must be adjusted.
By combining Convsun's industrial expertise with Eule27's optical modeling, spectral analysis, and process integration, this partnership sets a completely new benchmark for industrial-grade optical monitoring and reverse engineering.
Want to know more about how these algorithms can support your own production goals? Contact us directly for a software consultation tailored to your facility, or read the full case study on the Avantes website.
About Eule 27
Founded two years ago, Eule27 combines deep technical expertise in optical thin films with modern software development — custom software for individual customers, and from autumn 2026 additionally as EulenStudio, our standard product. Our team brings years of practical experience developing optical interference coatings for architectural glass, display technology, and solar applications together with modern AI approaches. We bridge the gap between theory and production, delivering end-to-end solutions.
Frequently Asked Questions (FAQ)
Everything you need to know about Eule27's All-in-One integration.
How do you measure AR coatings accurately on heavily textured solar glass?
Does Eule27 support hardware integration for in-situ optical monitoring — both Broadband (BBM) and Single-Wavelength (SWM)?
Which industries and applications is Eule27 software suited for?
How does EulenControl differ from a conventional thickness monitor or process monitoring software?
How easy is EulenControl for the machine operator — and who controls the settings?
What does EulenControl cost — and why is it more affordable than custom development?
When is EulenStudio available — and what happens to EulenControl?
Why haven't I heard of Eule27 yet?
Where you canmeet us
Optical thin-film software is easier to judge with the people who wrote it standing next to it. Here is where to find us next.
PSE 2026 — 20th International Conference on Plasma Surface Engineering
Messe Erfurt, Germany
EulenStudio in the EFDS member gallery, during the industrial exhibition.
ICCG 2026 — International Conference on Coatings on Glass and Plastics
Berlin, Germany
Talk in session 3, Smart Manufacturing and Process Control.
LatestEule27 joins the EFDS
Get in touch
How can we best support you?