Optical Surface: Radius Tolerance ±0.1% to ±0.01%

Q: What is the difference between surface roughness and surface accuracy in optical surfaces?

Surface roughness refers to microscopic irregularities (typically measured in Ångströms) that cause light scattering, while surface accuracy describes macroscopic deviation from the ideal shape (measured in wavelengths) that causes optical aberrations. Roughness affects scatter loss and coating adhesion; accuracy affects imaging quality.

Q: Why are multiple coatings applied to optical surfaces?

Multiple dielectric layers create interference effects that enhance specific optical properties. Anti-reflection coatings use quarter-wave stacks to minimize reflection across broad bandwidths. High-reflection coatings use alternating high/low index layers to achieve >99% reflectance. Dichroic coatings transmit/reflect different wavelengths selectively.

Component Specifications

Definition

An optical surface is a precisely manufactured interface on optical components (lenses, mirrors, prisms, windows) that interacts with electromagnetic radiation. Its geometry, smoothness, and coating determine optical performance through controlled reflection, refraction, diffraction, or transmission. Critical parameters include surface form accuracy (typically λ/4 to λ/20), surface roughness (often <10Å RMS), and coating specifications. Optical surfaces are fundamental in systems requiring light manipulation, from simple magnifiers to advanced photolithography and laser systems.

Working Principle

Optical surfaces operate based on the laws of physical optics (Snell's law, Fresnel equations) and wave optics. When light encounters the surface interface between two media with different refractive indices, it undergoes reflection, refraction, or transmission depending on the surface properties. The surface curvature (spherical, aspheric, planar) determines focal properties, while coatings (anti-reflection, high-reflection, dichroic) modify spectral response. Surface imperfections (roughness, waviness) cause scattering losses and aberrations that degrade optical performance.

Materials

Substrates: Optical glass (BK7, Fused Silica, SF11), crystals (CaF2, ZnSe), ceramics (Al2O3), polymers (PMMA, Polycarbonate). Coatings: Dielectric stacks (MgF2, TiO2, SiO2), metallic films (Al, Ag, Au), hybrid coatings. Surface treatments: Polishing compounds (cerium oxide, diamond slurry), ion beam figuring, magnetorheological finishing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Scratch Dig	60-40 to 10-5 per MIL-PRF-13830B
Centering Error	<1 arcmin to <10 arcsec
Radius Tolerance	±0.1% to ±0.01%
Surface Accuracy	λ/4 to λ/20 @ 632.8nm
Surface Flatness	λ/2 to λ/20
Surface Roughness	<10Å RMS (typically 5-20Å)
Laser Damage Threshold	1-10 J/cm² for ns pulses
Coating Reflectance/Transmittance	>99% or AR <0.25% per surface

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10110, ISO 14997, DIN 3140, MIL-PRF-13830B, ISO 9211

Parent Products

This component is used in the following industrial products

Optical Lens/Reflector

An optical component that controls and directs light output from LED sources in spotlights.

View Product Details

Engineering Analysis

Risks & Mitigation

Surface contamination affecting performance
Coating delamination under thermal cycling
Laser-induced damage exceeding threshold
Mechanical damage during handling/cleaning
Environmental degradation (humidity, chemicals)

FMEA Triads

Trigger: Improper cleaning procedure
Failure: Surface contamination causing increased scatter and reduced transmission
Mitigation: Implement cleanroom protocols, use appropriate solvents/lint-free wipes, regular inspection

Trigger: Thermal expansion mismatch between coating and substrate
Failure: Coating cracking or delamination under temperature variation
Mitigation: Match thermal expansion coefficients, use graded interfaces, environmental testing

Trigger: Exceeding laser damage threshold
Failure: Localized melting, ablation, or coating destruction
Mitigation: Specify appropriate damage thresholds, implement beam conditioning, monitor power density

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Surface form: Typically λ/4 PV @ 632.8nm for commercial, λ/20 for precision. Roughness: <10Å RMS for visible, <5Å for UV applications. Coating uniformity: <±2% spectral variation across surface.

Test Method

Interferometry (Fizeau, Twyman-Green), profilometry (stylus, white-light), scatterometry (BSDF measurement), spectrophotometry, visual inspection per MIL-PRF-13830B

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Optical Surface

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

ZHHIMG

Jinan, Shandong, CN

Also makes: Surface Plate, Machine Base, Air Bearing

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Optical Surface Plate”
View source page ↗ zhhimg.com · checked 2026-09-05

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between surface roughness and surface accuracy in optical surfaces?

Surface roughness refers to microscopic irregularities (typically measured in Ångströms) that cause light scattering, while surface accuracy describes macroscopic deviation from the ideal shape (measured in wavelengths) that causes optical aberrations. Roughness affects scatter loss and coating adhesion; accuracy affects imaging quality.

Why are multiple coatings applied to optical surfaces?

Multiple dielectric layers create interference effects that enhance specific optical properties. Anti-reflection coatings use quarter-wave stacks to minimize reflection across broad bandwidths. High-reflection coatings use alternating high/low index layers to achieve >99% reflectance. Dichroic coatings transmit/reflect different wavelengths selectively.

How are optical surfaces tested for quality?

Interferometry measures surface form and flatness. Profilometry (contact or optical) quantifies roughness. Scatterometry evaluates light scattering. Spectrophotometry verifies coating performance. Visual inspection under controlled lighting checks for scratches and digs per military standards.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Optical Surface