Optical mirror fabrication

Sydor Optics fabricates an array of metallic and dielectric optical mirrors to meet your custom specifications and requirements. Optical mirrors basically consist of a polished substrate with a metallic coating or dielectric coating on the front surface, but different applications require different levels of precision optical mirrors.

That’s why Sydor Optics offers a variety of optical mirrors manufactured from various materials in various shapes and sizes including lightweight mirrors to the utmost precision and exacting engineering standards based upon decades of experience. With the largest collection of double-sided grinding and polishing machines in North America, Sydor Optics can manufacture custom optical mirrors with virtually any optical coating paired with precision flatness, surface roughness and other critical tolerance specifications.

  • High-volume capabilities
  • Custom optical mirror manufacturing and polishing
  • Custom cutting/unique geometry capabilities
  • Diameter up to 750mm
  • Thickness up to 100mm

Available Material Types

Based upon customer demand, Sydor Optics offers Optical Mirrors made from the following substrate materials. Of course, if you don’t see a material you need, please contact a Sales Engineer, who will gladly discuss additional options that may be available.

Optical mirror applications
Optical Mirror Manufacturing Limits
Specifications Measurements
Diameter ≤ 750mm
Length / Width ≤ 600mm x 450mm
Thickness ≤ 100mm
Thickness Tolerance ± 0.01mm
Cosmetics (MIL-PRF-13830B) 60-40 to 10-5
Surface Roughness - before coating ≥ 3 Ǻ rms
Reflected Wavefront Error (RWE) - before coating ≥ 1/20 wave over clear aperture
Clear Aperture ≤ 95%

Types of Metallic Mirrors

Gold Coated Mirrors

Gold-coated optical mirrors provide the highest reflectivity and the highest environmental stability for infrared (IR) wavelengths, up to 98-99% throughout the infrared spectrum. Optical mirrors coated with gold (Au) are ideal for applications in the 750 – 1500nm wavelength range beyond 12um. Sydor Optics can custom manufacture gold-coated mirrors to meet the reflectivity and environmental stability requirements for your specific optical mirror applications.

Silver Coated Mirrors

Silver-coated optical mirrors provide excellent reflectivity, between 95-99% even into the far infrared spectrum and greater than 95% reflectivity from 450nm to beyond 12μm. However, mirrors coated with silver (Ag) may be less ideal for some applications since they can have less than 90% reflectivity in the blue and ultraviolet spectral areas. Fortunately, Sydor Optics can custom manufacture silver-coated mirrors to meet the reflectivity and light transmission requirements for your specific optics applications — along with protective coatings to help protect silver-coated mirrors from tarnishing.

Aluminum Coated Materials

Aluminum-coated optical mirrors are perhaps the most common and least expensive types of optical coating, and they are more durable than silver-coated mirrors. Aluminum (Al) reflects roughly 88-92% of the visible light spectrum, and greater than 85% reflectivity over a wide range of wavelengths in the UV, visible, and IR spectrum. Sydor Optics can custom manufacture aluminum-coated mirrors — with expert control of the thickness and density of aluminum coatings — to manipulate the reflectivity and light transmission for your specific requirements.

Nickel Coated Mirrors

Nickel-coated optical mirrors are relatively insensitive to wavelengths and are ideal for use in scatter-sensitive optical applications that require superior resistance to heat and thermal damage. Nickel (Ni) coated mirrors offer excellent corrosion resistance, hardness (Rockwell C hardness of approx. 49) and uniform thickness. Sydor Optics can custom manufacture nickel-coated mirrors — with a variety of finishings — to meet the specific requirements of your optics applications.

Chrome Coated Mirrors

Chrome-coated optical mirrors reflect less, absorb more, and are more durable than aluminum or gold and are relatively insensitive to wavelength. Chrome is frequently used as an undercoating in conjunction with other metallic coatings.

Copper Coated Mirrors

Copper-coated optical mirrors are most useful and common for applications involving the NIR and IR spectral regions as well as laser beam delivery, beam shaping, and laser beam guidance systems. Optical mirrors coated with copper (Cu) provide high heat capacity and conductivity and significant reflectivity. Sydor Optics can custom manufacture copper-coated mirrors — to meet your specific optical mirror applications — along with a variety of finishes and protective coatings as well.

Titanium Coated Mirrors

Titanium-coated optical mirrors are low density and high strength and are ideal for high-temperature environments and wherever superior corrosion-resistance is needed. Sydor Optics can fabricate custom titanium-coated optical mirrors to best meet the needs of your specific requirements.

Optical mirror applications

Types of Dielectric Mirrors

Dichroic Mirrors

Dichroic mirrors are typically categorized by the color of light they reflect. Longpass dichroic mirrors which are highly reflective below a cutoff wavelength, and highly transmissive above are the opposite of shortpass dichroic mirrors which are highly reflective above a cutoff wavelength, and highly transmissive below it. Dichroic mirrors can also have a low or high cutoff to reflect or pass specific colors.

Broadband Mirrors

Unlike optical mirrors that can be custom fabricated for specific wavelengths or ranges, broadband mirrors are designed to reflect a broad spectrum of light, including the entire visible spectrum of light.

Infrared (IR) Mirrors

Infrared mirrors are designed to reflect and enhance wavelengths in the infrared spectrum, and can be customized for specific wavelength ranges. High-precision, infrared mirrors are ideal for various applications, including laser beam steering.

Ultraviolet (UV) Mirrors

Sydor Optics offers a variety of ultraviolet mirrors designed with specific coatings for high reflectance for specific ultraviolet (UV) wavelengths. As with other types of optical mirrors, UV mirrors can be fabricated in various shapes, sizes, and degrees of flatness.

Hot Mirrors

Hot mirrors are another type of dielectric mirror which reflect heat, transmit visible light, and reflect infrared (IR) light. Hot mirrors (like cold mirrors) can be fabricated with varying incidence angles, from 0 to 45 degrees, and are useful for protecting heat-sensitive optical components in a variety of applications.

Cold Mirrors

Cold mirrors reflect the entire spectrum of visible light, yet transmit near-infrared and infrared wavelengths quite efficiently. Cold mirrors can be fabricated with incidence angles ranging from 0 to 45 degrees, and various multi-layered dielectric coatings for versatile use.

Optical mirror applications

Mirror Shapes

Sydor Optics can manufacture custom optical mirrors — with various shapes and sizes — using CNC Glass Machining or Laser Machining capabilities to meet your specific needs.

Some of the standard optical mirror shapes that Sydor Optics customers frequently order include:

  • Circular Mirrors
  • Square Mirrors
  • Rectangular Mirrors
  • Elliptical Mirrors

Lightweight Optical Mirrors

Mirror light-weighting offers several advantages to conventional mirrors of the same size, including lower system costs, shorter thermal equilibrium times, and reduced weight. Sydor Optics offers the experience, technology, and know-how to fabricate lightweight mirrors to meet your needs.

Optical mirror applications

Aerospace / Defense

Illumination Systems

Imaging Systems


Laser Systems

Long Range Telescopes