Optical Metrology & Testing

Optical Metrology & Testing

Precision Inspection and Qualification of Optical Components and Systems

At Yighen Ultra Precision, quality is never an afterthought. Our optical metrology and testing services ensure that every component and assembly we deliver—whether prototyped or mass-produced—meets the most demanding optical and geometric specifications. From surface figure and roughness to coating performance and MTF validation, we use state-of-the-art metrology equipment to qualify your optics with confidence.

We support glass and plastic optics, aspheric and freeform surfaces, and complex lens assemblies with comprehensive inspection data, making us a trusted partner for high-precision optical manufacturing and system integration.

Our Optical Testing Capabilities

🟢 Surface Figure & Irregularity Testing

• Interferometry (Twyman-Green, Fizeau) for λ/10 and better

• 3D profilometry for freeform and aspheric surfaces

• Peak-to-Valley (P-V), RMS, and slope error analysis

• Supports plano, spherical, aspheric, and complex geometries

🟢 Surface Roughness Measurement

• Atomic Force Microscopy (AFM) and white-light interferometers

• Achievable Ra down to 1–2 nm on diamond-turned or polished optics

• Essential for minimizing stray light, scattering, and coating adhesion issues

🟢 Geometric Dimension & Tolerance Testing

• High-precision CMMs (Coordinate Measuring Machines)

• Roundness, centration, wedge, and decentration testing

• For lens elements, barrel assemblies, molds, and jigs

• Measurement resolution down to 0.1μm

🟢 Coating Performance Testing

• Spectrophotometers (UV–VIS–NIR–SWIR) for transmission/reflectance

• Uniformity testing for AR, HR, beamsplitter, and filter coatings

• Environmental testing: humidity, salt spray, adhesion (MIL-STD)

🟢 System-Level Optical Testing

• Modulation Transfer Function (MTF) validation

• Point Spread Function (PSF) and wavefront error analysis

• Focal length, back focal length (BFL), and effective F-number testing

• Customized jigs for collimator modules, relay optics, lens barrel assemblies

Certified Optical Quality for Demanding Industries

Our optical inspection procedures meet international standards:

• ISO 10110 standards for optical drawing and tolerancing

• ISO 14997 surface imperfection grades

• MIL-PRF-13830B scratch/dig inspection

• ISO 9001 & ISO 13485 quality management systems

We routinely test optics for:

• Medical devices (endoscopy, OCT, diagnostics)

• Laser systems (LIDT, beam quality, coatings)

• Infrared imaging & sensing (SWIR, MWIR)

• AR/VR & automotive optics

• Optomechanical modules and assemblies

In-House Metrology Equipment

Yighen's in-house metrology lab is equipped with a wide array of high-end tools:

All inspection is performed in temperature-controlled environments to ensure measurement repeatability and stability.

Integrated QA with Prototyping and Mass Production

Optical metrology is not a separate service—it’s part of everything we do. At every stage of development, we provide clients with:

✅ Comprehensive inspection reports
✅ First Article Inspection (FAI) and qualification batches
✅ Coating and assembly validation
✅ Digital records for traceability and documentation

Why Optical Metrology Matters

High-performance optics only deliver value when they work exactly as intended. Inaccurate surface figure, misaligned components, or inconsistent coatings can degrade system performance or cause failure in the field.

Yighen helps clients avoid these issues by combining:

• Advanced inspection equipment

• Experienced optical engineers and QA specialists

• Integrated workflows from design to delivery

• Quick feedback loops during prototyping and production ramp-up

🔬 Don’t Guess. Measure It — Down to the Nanometer.

At Yighen, metrology is not an afterthought — it’s built into every stage of our optical manufacturing process.
From interferometry and profilometry to focal length and MTF testing, we ensure your optics meet design intent and system performance.

Whether it’s a prototype or full production batch, we help you verify, compare, and improve optical quality.

🔵 Request a Measurement or Quality Review
📩 Send us your spec or sample — we’ll respond within 24 hours with measurement feasibility and recommendations.

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Want to explore our metrology tools and measurement capabilities?
📄 Download Our Metrology Equipment List

Need to check how we validate surface, form, and system-level performance?
👤 Learn More About Yighen

🔗 Related Content

• 🧪 Prototyping Optical Components
  Get testable samples fast — and know they meet spec from day one.

• 🛠️ Ultra-Precision Machining
  Tight form tolerances are only as good as how precisely you measure them.

• 🏭 Optical Mass Production
  We apply metrology in process — not just post-inspection — to ensure consistent batches.

• ⚙️ Optical Tolerancing & Simulation
  Compare simulated performance with actual measured results to close the loop.