Custom Concave Spherical Mirrors
Avantier manufactures custom concave spherical mirrors for imaging, laser focusing, spectroscopy, sensing, illumination, and other precision optical systems. Mirrors are available in custom diameters, radii of curvature, substrate materials, surface specifications, and reflective coatings.
We support build-to-print manufacturing for prototypes, small production runs, and volume programs.
Key Specifications
| Parameter | Capability |
| Diameter | 5 – 500 m（custom available） |
| Radius of curvature | 25 – 4000 mm |
| Radius tolerance | ±0.5% ～ ±2%（typical ±2%） |
| Surface figure | λ/4 @ 632.8nm（standard）；λ/10 ～ λ/20（high precision） |
| Surface quality | 40-20 scratch-dig（standard）；20-10（precision） |
| Surface roughness | < 1nm RMS（typical for polished optics） |
| Clear aperture | >90% of diameter |
| Center thickness | Custom（depends on diameter & radius） |
| Edge thickness | Custom（depends on diameter & radius） |
| Dimensional tolerance | ±0.1mm |
| Operating wavelength | UV ～ IR |
| Production quantity | Prototype to volume production |
Surface-figure specifications should define the test wavelength, clear aperture, and whether the requirement applies to surface error or reflected wavefront error.
Materials and Coatings
Available substrate materials include:
- Available substrate materials include:
- BK7 Grade A optical glass
- Corning Fused Silica 7980
- UV-grade fused silica（JGS1, JGS2）
- Zerodur®（low thermal expansion）
- Copper（for high-power applications）
- Aluminum
Custom materials upon request
Available reflective coatings include:
- Protected Aluminum（Ravg >85% @ 350–1550nm）
- Enhanced Aluminum（190–900nm）
- UV / DUV Enhanced Aluminum
- Protected Silver（highest reflectance @ 500–800nm, Ravg ~97% visible）
- Protected Gold（NIR / MWIR / LWIR）
- Bare Gold
- Broadband dielectric coatings（custom wavelength ranges）
Coating performance can be specified by wavelength range, angle of incidence, polarization, and environmental requirements.
Custom Options
Custom manufacturing options may include:- Nonstandard diameters and radii
- Custom center and edge thicknesses
- Special substrate materials
- Custom coatings
- Tight surface-figure requirements
- Noncircular geometries
- Central apertures
- Mounting features
- Special edge treatments
Standard Geometries
| Radius of Curvature, R (mm) | Diameter, D (mm) | Edge Thickness, Te (mm) | Center Thickness, Tc (mm) |
| 50 | 25.4（1 inch） | ~6.35 | ~4.71 |
| 100 | 25.4（1 inch） | Custom | Custom |
| 250 | 25.4（1 inch） | Custom | Custom |
| 500 | 25.4（1 inch） | Custom | Custom |
Additional radii, diameters, thicknesses, and nonstandard geometries are available upon engineering review.
Quality and Inspection
Available inspection and documentation may include:- Radius measurement
- Interferometric surface-figure testing
- Surface-quality inspection
- Surface-roughness measurement
- Dimensional inspection
- Coating performance data
- Interferograms and inspection reports
Request a Quote
Please provide a drawing or the following key requirements:- Diameter
- Radius of curvature or focal length
- Center and edge thickness
- Substrate
- Coating and wavelength range
- Surface figure
- Surface quality
- Clear aperture
- Quantity
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