Dual AR coated windows (DAR)
Description
Dual AR coatings designed to reduce the reflectivity of a component to near-zero for two certain wavelengths.
Usually these coatings are used in multi-frequency laser output systems (e.g. frequency doubling).
This coating provides very high transmission at two different wavelength. Typical wavelengths and reflection curves of an AR coating suitable for the prevalent laser system output at 1064nm and 532nm are shown below.
Coatings are provided by Ion Beam Sputtering (IBS) or Electron beam evaporation with/without Ion assistance coating techniques.
The measured residual back reflection curve for DAR coating (AR @ 532+1064; AOI = 0o) |
Standard Specifications
| Coating Adhesion and Durability
|
Per MIL-C-675A
|
| Substrate surface quality
|
20/10 SD
|
| Substrate wavefront distortion
|
< L/8
|
| Substrate dimension tolerance
|
+0/-0,1 mm
|
| Clear Aperture
|
>90% of diameter
|
| Laser Damage Threshold |
>6 J/cm2 for 10 ns pulses @ 1064 nm
|
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