These coatings are designed to increase the transmission over a broad spectrum
Coatings are provided by Ion Beam Sputtering (IBS) or Electron beam evaporation with/without Ion assistance coating techniques
Dual Anti-Reflection Coatings in the range 0.19-10.6 µm are available
Dual AR coated windows designed to reduce the reflectivity of a
component to near-zero for two certain wavelengths.
Usually these windows are used in multi-frequency laser output
systems (e.g. frequency doubling).
This type of coating provides very high transmission at two
different wavelength. Typical wavelengths and reflection curves
of an AR coating suitable for the standard laser system output at
1064 nm and 532 nm are shown below.