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Sapphire Windows | Sherlan Optics

Infrared Optics, Windows
  • Specifications

Sapphire Windows

Sapphire is the hardest material in the world other than diamond, and exhibits resistance to many chemical acids and alkali. It also has very good scratch resistance, a high dielectric constant, and high thermal conductivity. Sapphire’s maximum temperature rating of almost 2000 ° C makes it ideal for lamp shields, high temperature combustion chambers, furnace systems, and gas processing. A supported sapphire window remains at peak performance up to 1700 ° C and may reach 1950 C with absolutely no change to its shape and only the very slightest decrease in optical performance. Sapphire is unique among optical material in this regard.

Sapphire is also inert in the presence of molten metal, acids, and all caustic agents with the sole exception of hot caustic salts. This makes sapphire to be an ideal choice for plasma chambers, sapphire lamps, and other situations where heat and corrosive chemicals would destroy any other optical substrate. Their chemical inertness also makes them a good choice for medical and pharmaceutical applications, where maintaining purity of the surrounding substances is key.

The structural strength of sapphire also makes it suitable for a wide range of applications where high pressures would compromise other optics; for instance, in aircraft sensors, deep sea windows, or sight windows on pressurized experiment vessels. Since sapphire is highly resistant to scratches it provides consistently optical clarity even under abrasive conditions or under exposure to sand and grit that would ruin any other optic. This makes it ideal for optical windows on smart phone cameras, for gun sights, and for down hole and drilling vision systems.

The sapphire window is ideal for use under demanding conditions and in harsh, stringent environments. Sapphire transmits well in both UV and IR ranges. As with all optical materials, the thinner the window the deeper into the UV and IR it transmits, and our ultra-thin sapphire windows offer very deep transmittance.

Sherlan Optics offers single crystal to manufacture high quality sapphire windows and precision optical components, and because of sapphire’s high mechanical strength we are able to make these optical windows much thinner and with better transmittance than other dielectric windows. Uncoated sapphire transmits best between 170 nm and 5.5 µm. We are able to provide custom windows to meet any specification, and our design team would be happy to discuss your application and help you come up with an optical solution that best suits your needs.

Factory Standard 

  • Material: Optical Grade Sapphire (Al2O3)
  • Dimension: +0, -0.1mm
  • Surface Flatness: 1/2λ per 25 mm at 633 nm over clear aperture
  • Surface Quality: 40-20 scratch and dig, beveled edges
  • Crystal axis cut: random (c-cut available upon request)
  • Refractive index: 1.77 @500nm
  • Center Thickness (CT): +/-0.1mm
  • Parallelism: 1 arc minutes
  • Clear Aperture: 90% of diameter
  • Coating: Customized

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    Sherlan Optics
    Tel: 86-431-89235797
    Add: Boxue Road, Changchun, China