Industry standard for precision and innovation: vibration-insensitive 3D measurement
4D Technology is the leader in high-resolution surface, geometry and wavefront measurements for challenging locations and applications.
Discover our Products & Solutions


Optical Metrology
Astronomy, Optics Manufacturing, Aerospace & Defense, Free-space Optics & Research
4D Technology’s Optical Metrology Products assure the quality of precision optics and optical systems. Our Dynamic Interferometry assures the surface and wavefront quality, despite vibration or turbulence.
It’s no surprise that virtually every space- and ground-based telescope for the last two decades has been tested with 4D instruments.
Across the spectrum, from UV to LWIR, 4D instruments, technology and software are everywhere optics are made and used.
Industrial Inspection
Aerospace, Aviation, MRO, Precision Machining, Medical Devices, Renewable Energy & Automotive
High-resolution, optical 3D measurement gauges you can bring right to your part. With one-button operation, quickly and accurately quantify defects such as pits, scratches, and corrosion and geometries such as edge break, chamfers, and radius.
Handheld, shop floor, and automated capabilities.


Measurement anywhere.
PhaseCam Twyman Green
- Twyman-Green interferometer
- Patented instantaneous, vibration-immune technology
- Concave optics, meter-class telescope optics, large imaging system alignment, moving parts
- VISIBLE-NIR-SWIR-LWIR
AccuFiz Fizeau
- Fizeau interferometer with dynamic interferometry
- Flats, lenses, vacuum/environmental chambers
- VISIBLE-NIR-SWIR
NanoCam Optical Profiler
- Patented instantaneous, vibration-immune surface roughness profiler
- Optical polish and surface finish
- Angstrom-level resolution
4D InSpec Optical Surface Gauge
- Patented instantaneous 3D surface measurement
- Portable, shop floor measurements
- Measure features such as edge break, chamfers, and radii and defects such as pits, dents, and corrosion
- Measure down to 2 microns
- Handheld, workstation, or robot-mounted
4Di InSpec AMS
- Automated surface defect and feature inspection
- High-throughput, high-resolution
- Measure dozens of features and defects in minutes rather than days
4D SurfSpec Coating Gauge
- Coating assurance gauge
- < 15nm resolution
- Raw materials, e-coat, & painted surfaces
- Portable handheld or robot-mounted
References for Optical Testing
Why Choose 4D?
What’s New

4D Technology Receives Multiple Orders for New High-resolution, Vibration-immune AccuFiz® SWIR Interferometer
4D Technology Receives Multiple Orders for New High-resolution, Vibration-immune AccuFiz SWIR Interferometer. 4D Technology, a subsidiary of Onto Innovation, announced today the production release of the new one-megapixel (1 MP), high-resolution AccuFiz® Short...

How Optical Gauges are Revolutionizing 3D Metrology for Precision Inspection
In this interview, Dr. Erik Novak, Vice President, and Kris Brown, Application Engineer from 4D Technology, speak to AZoOptics about the impact of optical gauges and how 3D Metrology can be used for precision inspection. Throughout this interview, Erik and Kris will...

4D Technology Introduces AccuFiz® Duo Fizeau Interferometer
High precision, dynamic interferometer combines short and long coherence capabilities into one system for measuring an expanded range of optics. 4D Technology, a subsidiary of Onto Innovation, announced today the launch of the AccuFiz Duo Fizeau interferometer. The...

Onto Innovation’s 4Di InSpec™ Automated Metrology System Receives 2024 Innovative System of the Year Award from FANUC America
Automated defect and feature metrology system enables new levels of quality and reduced rework for aerospace components further enabling aviation safety standards Onto Innovation Inc. (NYSE: ONTO) and its Tucson subsidiary 4D Technology today announced they’ve been...