Sunday Optics manufactures custom spherical mirrors for optical instruments and OEM assemblies. Our available diameter range is 2–400 mm, with substrate and reflective coating options selected around your optical and mechanical requirements. We combine component fabrication with coating, optical design and assembly services to help develop a optical mirror specification that fits your system.
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Applications and Design Priorities
◆ Spectroscopy and optical instruments: Concave spherical mirrors can collect and focus light. Match focal length, usable aperture and coating response to the instrument layout.
◆ Laser optical systems: Evaluate the mirror geometry, beam footprint, coating absorption and laser damage requirements together.
◆ Illumination and light collection: Select the curvature and diameter around the source position, collection angle and available installation space.
◆ Reflective imaging: Review object and image distances, field angle and spherical aberration against the required image quality.
Specifications
| Diameter | 2mm to 400mm |
| Diameter Tol. | +/-0.1 |
| Material | Bk7 sapphire fused silica, ZnS2, CaF2, Si, Ge. |
| Surface Quality | 40-20 standard |
| Flatness | 1/4 lambda |
| Chamfer | 0.25mmx45degree |
| Coating | AR, HR, Silver, Aluminum. Golden. |
How to Specify a Custom Spherical Mirror
◆ Curvature and focal length: Identify the required concave or convex reflective surface for review. A concave spherical mirror converges an incoming collimated beam; a convex spherical mirror causes it to diverge. In the paraxial approximation, the focal-length magnitude is half the radius-of-curvature magnitude. Aperture and working geometry must also be considered because spherical aberration affects focusing.
◆ Mechanical fit: Provide the outside diameter, clear aperture, center and edge thicknesses, bevel and mounting constraints. The clear aperture defines the usable optical area and should be specified separately from the outside diameter.
◆ Optical acceptance: State the radius tolerance, surface-figure requirement, scratch-dig grade and coating specification. For surface figure, identify the test wavelength, evaluation aperture and whether the limit applies to surface error or reflected wavefront error.
Sunday Optics brings optical processing, polishing, coating and assembly into one company. This supports coordination between mirror geometry, coating requirements and integration into the finished optical system.
Our metrology resources include three Zygo interferometers and two spectrophotometers. For your spherical mirror order, discuss the required dimensional checks, surface evaluation, coating measurements and inspection documentation during quotation. Acceptance criteria should refer to the approved drawing and specified test conditions.
Reflective Coatings for Spherical Mirrors
| Coating Option | Selection Considerations |
|---|---|
| Aluminum-coated spherical mirror | A starting option for broadband reflection. Visible or UV performance depends on the coating design and any protective or enhancing layers. |
| Silver-coated spherical mirror | Consider for visible and infrared reflection. Discuss the protective layer, humidity exposure and handling requirements. |
| Gold-coated spherical mirror | Consider for near-infrared and infrared systems. Specify the working band and minimum reflectance needed by the instrument. |
| Dielectric HR coating | Consider when high reflection is required over a defined wavelength range. Specify incidence angle and polarization with the spectral requirement. |
Choose the coating around the operating wavelength, angle of incidence and required reflectance. For laser systems, also provide the operating power or pulse conditions. Reflectance and laser damage requirements are evaluated for the selected coating and operating conditions. Explore our metal mirrors and dielectric mirrors for related coating options.
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