Optical Coatings

We utilize E-beam, IBS, Magnetron Sputtering, and Ion Assisted Deposition coating technologies to satisfy the spectral, mechanical, laser damage, pricing, and environmental conditions unique to our customers. We have a strong reputation for coating performance within 193-3000nm.

Optical Coating Process

ARO offers a complete catalog of coatings – anti-reflective, broadband AR, short and long wavepass filters, high reflectors, beam splitters and polarizers. We have a variety of coating technologies available to satisfy the spectral, mechanical, laser damage, and environmental conditions of customer required coatings. Our chambers range in size from 28” to 54”. We clean and inspect our optics in a class 10,000 clean room and use other techniques to produce absolute pristine surfaces. We use FilmStar design and characterization software to design customized coatings.

We have a strong reputation for excellent performance in the UV-Excimer wavelengths, starting at 193 nm. ARO uses evaporative E-beam technology for many of or our thin film coatings because this method is typically faster and less expensive than alternative methods on the market. For thin film coatings at lower wavelengths, using E-beam technology allows ARO to produce optics with some of the highest laser damage certifications and longest lifetimes in the industry.

Optical Coating Technology

ARO can select from Electron-beam deposition, Magnetron Sputtering, and IBS coating chambers. Ion-assisted deposition (IAD) technology can be used in the E-beam and IBS coating chambers. Magnetron Sputtering and IBS coating techniques are preferred when a more mechanically durable and environmentally stable coating is required because they produce higher density coatings.

Our IBS chamber is equipped with an optical monitor and larger targets, so it can be used to produce more difficult coatings requiring precise layer control and longer coating times. IBS technology is well suited for coating in the MWIR region of the electromagnetic spectrum and as well as for filter coatings requiring sharper cut-offs. Because IBS coating deposition temperatures are lower, there is a reduced change in surface figure on higher aspect ratio substrates.

For verification of spectral specifications, we use lamda 1050 and lamda 900 Perkin Elmer spectrophotometers which allow us to measure from 188nm to 3 microns. We have in-house capabilities to test for specified environmental requirements including abrasion, adhesion, humidity, temperature, and temperature influence.

General Coating Capabilities

Functional coatings

HR % Reflectivity / AR % Reflectivity / Anti-Reflective Multiple Band / High Reflective Metallic / High Reflective Dielectric / Metal Coatings/ Dichroic Long Pass / Dichroic Short Pass / Polarizing Beam Splitter

Wavelength Range

DUV to Near IR: 193 nm – 3 micron

Reflectivity

0.2 – 99.5%

Dimensions (diameter or square)

5 mm – 430 mm

Angle of Incidence

0-60°

Laser-Induced Damage Threshold (LIDT)
  • Average of 26 J/cm2 @ 1064nm @ 20ns pulse width @ 0° AOI
  • Average 35 J/cm2 @ 1053nm @ 20ns pulse width @ 45° AOI
  • Average 8.5 J/cm2 @ 308nm @ 152ns pulse width @ 0-45° AOI
  • Deposition Technology

    Electron Beam Deposition / Magnetron Sputtering / IBS / Electron Beam with Ion Assisted Deposition / IBS with Ion Assisted Deposition

    Cleaning Technology

    Solvent Wipe / Spin Cleaning

    Environment

    Laminar Flow Hoods Class <100 / Clean Space Class <10,000

    Metrology

    Lamda 1050 and Lamda 900 Perkin Elmer Spectrophotometers / Angular Attachment Polarizer for Spectrophotometer Measurements / Vertical and Horizontal Zygo Interferometer / Environmental Chamber BHD-203

    Environmental Tests

    Tape Test / Abrasion Test / Thermal-Humidity Test / Temperature Influence Test / Stress Test

    Durability

    MIL-PRF-13830B APP C, MIL-C-48497A, MIL-M-13508C, MIL-F-48616, MIL-C-675C, ISO 10110-(1-14), PARA C.3.8.4, PARA C.3.8.5

    Coating Tooling

    2,200+ Coating Tools in-House / Custom Tooling Design

    Production Quantities

    Run capacity of 450 1” diameter parts / Prototype to Production Volume

    Packaging

    PetG’s / Optic Boxes with Inserts / Evacuated Nitrogen Sealed Bags / Tissue / Bubble Wrap / Custom Packaging Design