AR Coating
CONTROLS: Thin films deposited onto optical surfaces used to increase transmission of the surface. AR coatings are matched to the requirements of each optic, ranging from the most common and cost-effective single-layer MgF2 to custom, multi-band designs specific to a single application
RELATED TERMS: Witness sample (used to test performance), coating durability, adhesion, MIL-C-675C, MIL-F-48616, MIL-C-48497A, MIL-M-13508C
SPECIFICATIONS MUST CONTAIN: Wavelength band in linear units, Percent Reflectance or Transmission, Angle of Incidence (if other than normal incidence), and minimum coating aperture (if different than Clear Aperture).
SPECIFICATIONS MAY INCLUDE: Laser Damage Threshold in J/cm2 (include Pulse-width, wavelength, repetition rate, spot size), multiple wavelength bands, combinations of R and T specs, and polarization requirements.
OPTIMAX PREFERRED SPECIFICATION: Average Reflectance, normal incidence
REASONS: Metrology is the most straightforward
MANUFACTURING STANDARDS: MIL-C-675C, MIL-F-48616, MIL-C-48497C, MIL-M-13508C, MIL-C-14806A, ISO, OEOSC OPI.0110-9, OPI.9211-2, OPI.9211-2, OPI.9211-1
CLICK HERE TO DOWNLOAD PDF
OF THE MANUFACTURING TOLERANCE CHART
Learn from the Experts
Find out more by downloading our technical note on Phase Distortion On Interferometric Measurements Of Thin Film Coated Optical Surfaces
This paper discusses the difficulty in accurately interpreting surface form data from
a phase-shifting interferometer measurement of thin film interference-coated surfaces.
Samples of Standard Coatings Available at Optimax:
Single Layer (/4 thick) MgF2
- Most cost-effective option
- Same coating for all-optical glasses
- Performance varies with substrate index
Broad Band Antireflectives
Single Layer (/4 thick) MgF2
- BBAR optimized for 400-700nm
- Extended BBAR optimized for 450-900nm
- Ravg < 0.5%, Rmax < 1.0%, AOI: 0-30˚
- Better performance, higher cost
V-Coat AR’s
Single Layer (/4 thick) MgF2
- The best performance at a single wavelength\
- R < 0.2%, AOI: 0-20˚
- Can be optimized for any wavelength
