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  Capabilities / Thin-Film Coating

Thin-Film Coating

      RGQ and Order
Thin-Film Coating
A coating tray with ZnSe lenses.

II-VI is the recognized leader in designing and producing consistently low-absorption coatings for high-power CO2 laser optics. Our thin-film coating facility completes our vertically integrated component capability to allow optical fabrication, diamond-turning, and coating to be performed at the same location. Having a combined 170 years of experience, the II-VI coating department staff offers a broad coating range for CO2 laser and infrared imaging applications.
II-VI A coating technician reviews the coating process. II-VI Infrared cleaning technician
A coating technician reviews the coating process. A II-VI Infrared cleaning technician inspects parts after the coating process.

The Quality Difference

  • Custom-designed, state-of-the-art coating equipment in our high-volume infrared coating shops in Saxonburg and Singapore provide maximum OEM production capacity
  • Recognized as a quality supplier for coat-only services, custom thin-film designs, and military/aerospace defense services
  • Manufactures to the customers’ highest quality standards in performance, testing, and cosmetic requirements
  • Prototype coating designs, custom optical tooling, cleaning services
  • Automated computer and electronic controls for consistent and repeatable process monitoring
  • Clean room manufacturing (class 1,000 to 10,000), 12,000 sq. ft. area
  • Established practice in “Make It the Same,” to assure a consistent quality product regardless of where it is manufactured
II-VI provides a broad coating range for laser and infrared imaging applications:
  • Coatings on optics up to 16” in diameter
  • Coatings for wavelengths from the visible to infrared (.45 to 25 µm)
  • Custom coating design
  • High-efficiency broadband anti-reflective coatings
  • High-damage threshold low-absorption laser coatings
  • Very high-reflectivity mirror coatings
  • Broadband beamsplitter coatings
  • Substrates:
    • zinc selenide
    • zinc sulfide
    • zinc sulfide MultiSpectral
    • germanium
    • gallium arsenide
    • silicon
    • copper
    • aluminum
    • amtir
    • fused silica
    • silicon carbide
    • beryllium
    • molybdenum
    • other infrared transmitting materials
  • Optical tooling designs to hold most complex optical shapes and fixtures
  • MilSpec testing capabilities with additional internal stringent testing to meet most durability requirements
  • Customized coatings to meet customer needs and demands

Beam Delivery Coatings

We offer both high-reflective and transmission type coatings for all beam delivery applications.Reflective Coatings

  • MMR: our highest-reflection bend mirror coatings
  • ATFR: minimizes laser feedback
  • RPR: controls polarization and provides precision phase shift
    • 90º
    • 45º
    • 22.5º
  • TRZ: maintains incident polarization

Transmissive Coatings

Our AR coatings provide consistently low absorption and reflection to meet the high-power CO2 laser application needs demanded by OEM and aftermarket users.

  • AR coatings available
    • CO2 (CW)
    • CO2 pulsed
    • Dual wavelength
    • Dichroic
    • Ultra-low absorption MP-5®
  • Other custom wavelengths
    • Thin-Film Polarizer (TFP)
    • Dichroic beamsplitters
    • Other beamsplitters

Resonator Coatings


  • ZnSe
  • Ge
  • GaAs

Partial Reflectors

Our consistent, low-absorbing coatings offer a wide wavelength range and reflection values for 0.25 to 10 inch part diameters. These parts are available in OEM volumes to custom one of a kind.

  • 5 to 98% reflective (standard)
    • CW
    • Pulsed
    • Ultra-low absorption MP-5®
    • Band-selective*
    • Rear Mirrors
Our all-dielectric coatings for high reflection, low absorption with controlled transmission are used in laser power monitoring.
  • 99 to 99.85% R (partial)
    • ZnSe
    • Ge
    • GaAs
II-VI also offers coatings for low-absorption total reflectors.
  • Total reflective coating
    • MMR and MMR-A (total)
      • Si
      • Cu
  • Band-selective coating*
    • Stable resonator
      • ZnSe
      • Ge
      • GaAs
    • Unstable
      • Si
      • Cu

Fold Mirrors

Our low-absorption coated intercavity mirrors are used to increase laser power or if desired, as polarization locking mirrors.

  • PLM
  • EG
Coating chambers at our Saxonburg facility.
Coating chambers at our Saxonburg facility.

*Specialized coatings designed to help force the laser cavity to lase at a desired wavelength band. Reflection and wavelength values are available in a wide range.

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