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Metal Reflective Coatings

Introduction: What are Metal Reflective Coatings, and Why Do You Need Them?

At OPCO, we understand the crucial role of metal reflective coatings in modern-day applications, especially in the optics and photonics industries. We are proud to offer a mirror coating specifically tailored to meet your unique requirements and performance criteria. With a dedication to innovation, quality, and technical expertise, we provide coatings that push the boundaries of performance and durability. 

Overview of Mirror Coatings from OPCO

Our diverse portfolio of mirror coatings caters to a broad spectrum of industries, applications, and environments. Whether you’re looking for a high reflectivity coating for your telescopes or any other type of mirror coating you may need, we’ve got you covered. Our coating offerings include:

  • Aluminum
  • Enhanced Al (Al+MgF2, overcoat) & Protected Al (SiO, SiO2, and others)
  • Enhanced Silver (Ag+oxide overcoat) & Protected Silver (Ag+SiO2 and other oxides)
  • Bare Gold, Protected Au (Au+SiO, SiO2, oxide overcoats)
  • Bare Platinum
  • Bare Chromium
  • Nickel alloys (NiCr, Inconel™) 
  • Bare Copper

Custom metal coatings to your specs

Spectrophotometer coating verification from 190nm to 20µm
– VUV verification down to 120nm available

Vertically integrated in-house manufacturing:
– Coating and fabrication in the same building
– Fabrication of custom shapes for mirror substrates
– Large inventory of glass substrate materials

Polarization: S, P or Average

Angle of Incidence: 0° to 70°

Substrate Material: Glass, Crystals, Metals, Ceramics, and plastics

Military Specifications: Mil-C-675, Mil-F-48616, Mil-M-13508, Mil-C-48497


Overview of Optical Mirror Coatings

Optical mirror coating is foundational to the field of optics, revolutionizing how we harness and manipulate light for various applications. But how does a mirror coating work, and how much of a difference does a mirror coating make in real-world applications?

Mechanism of Action of Mirror Coatings

The underlying principle of a mirror coating is the reflection of light. These coatings work by applying thin layers of metals, such as silver, gold, or aluminum, onto a substrate surface. The metal layers interact with the incident light, causing it to reflect off the surface. The result is a mirror-like surface that reflects light with high efficiency, which is crucial for applications that require precise light control.

Where Are Mirror Coatings Used?

Mirror coatings find use in a wide array of industries and applications. They’re pivotal in sectors such as telecommunications, medical technology, aerospace, and the military, to name a few. For instance, telescope mirror coatings provide astronomers with high reflectivity to view distant celestial bodies. In the medical field, mirror coatings enable intricate procedures, such as endoscopy and laser surgeries.

How Are Mirror Coatings Applied?

A mirror coating is applied using various techniques, depending on the required performance and application. Some of these techniques include physical vapor deposition (PVD), chemical vapor deposition (CVD), and sputter deposition. These processes create thin, uniform layers of metal on the substrate, enhancing the high reflective coating on the surface.

Materials Used for Metal Optical Coatings

The choice of material used in a metal optical coating is critical, as it impacts the optical performance, durability, and application compatibility of the coated component. Here’s a brief overview of some commonly used materials:

Metal Oxide Compounds

Metal oxide compounds, such as titanium dioxide (TiO2) and silicon dioxide (SiO2), are widely used in the optical thin film coating process. They are appreciated for their stability, durability, and ability to enhance the reflective and refractive properties of optical components. These coatings are used in applications like anti-reflective coatings, bandpass filters, and high-reflection mirrors.

Multicomponent Fluoride Compounds

These are employed in optical coatings for their low optical absorption and high transmittance in the ultraviolet (UV) to near-infrared (NIR) spectrum. Materials like magnesium fluoride (MgF2) and lanthanum fluoride (LaF3) are often used in anti-reflective and beam-splitting coatings.

II-VI and Semiconductors

II-VI and semiconductor materials such as zinc sulfide (ZnS), zinc selenide (ZnSe), and silicon (Si) are used in the production of an optical mirror coating for infrared applications. These materials exhibit excellent infrared transmittance properties.

Transparent Conductors

Materials like indium tin oxide (ITO) serve as transparent conductors. They’re utilized in creating a mirror coat that offers electrical conductivity and transparency. Such coatings are typically used in electro-optical devices and displays.


Pure metals like gold, silver, and aluminum are essential in the mirror coating process. They provide high reflectance for the mirror coat across different spectra. For instance, aluminum is used for UV and visible light applications, while gold is used for infrared applications.

Applications and Industries That Use Metal-Coated Optical Components

Metal-coated optical components, including mirror coatings and silver mirror coatings, are integral to various industries, providing unique solutions that enhance operational efficiency and innovation. Here are some of the key sectors that extensively use these components:


In the aerospace industry, metal-coated optical components play a vital role. They are used in manufacturing processes, metal plating for spacecraft, and lenses for various optical systems. High reflectivity coatings are used in space telescopes to observe distant astronomical objects, and a durable metallic coating helps protect aerospace equipment from harsh space conditions.


In the defense sector, these components are embedded in advanced military technology. They are found in tools, laser technology, and sighting systems. For instance, mirror coatings are often used in periscopes, night vision devices, and laser guidance systems. The robust metallic coatings can withstand the rigors of battlefield conditions, providing reliable performance in extreme scenarios.

Life Sciences

In the life sciences industry, particularly in biomedical technology, metal-coated optical components are found in laser devices used for surgery and diagnostics. For example, mirror coatings help direct laser beams during surgical procedures, while high reflectivity coatings enhance the performance of diagnostic equipment.


In the semiconductor industry, metal-coated components are essential for chip production. Metallic coatings are used in lithography systems that etch circuit patterns onto semiconductor wafers. High-reflectivity coatings are also used to increase the efficiency of inspection processes in semiconductor manufacturing.


Mirror coatings have become fundamental elements across a multitude of industries. From enabling precise astronomical observations and facilitating advanced medical procedures to aiding in the production of cutting-edge semiconductors, these coatings are instrumental in propelling technological progress. Employing a range of materials such as metal oxides, fluoride compounds, semiconductors, and pure metals, they cater to diverse applications while delivering high reflectivity, durability, and performance.

At OPCO, we are deeply committed to providing high-quality, innovative solutions tailored to your unique needs, thereby enhancing the functionality and efficiency of your optical components. For more information or to discuss your specific requirements, we encourage you to Contact Ryan at OPCO Laboratories. Moreover, you may wish to request a quote for your upcoming project.

We’re here to assist you in exploring the expansive world of possibilities with our superior mirror coating and metal coating capabilities and transforming those possibilities into tangible outcomes. We look forward to collaborating with you to help shape the future of your industry with our state-of-the-art optical solutions.

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