Output couplers and beam splitters have a special coating to reflect a defined percentage of the incident light and transmit the remaining part. The reverse side is generally AR coated at 10.6 µm.

Specifications:

• Diametre: + 0.0 mm; - 0.2 mm
• Thickness: ± 0.25 mm
• Wedge: < 3 arc min
• Surface figure: typ. λ /20 at 10.6 µm (depending on diametre/thickness ratio)
• Surface quality: 40-20 per MIL-O-1380A
• Clear aperture: 85 % of diametre
• Laser damage threshold: depending on beam diametre, typ. 3000 W/mm (CW CO₂ laser)
  (3 kW per mm of beam diametre 1/e²)

Output couplers are available in both planar and curved form.

• Angle of incidence: 0°
• Reflectivity tolerance: Data upon request

Beam splitters are typically used at an angle of 45° and optimised for each polarisation.

• Angle of incidence: 45°
• Reflectivity tolerance: Data upon request
• Polarization independent beam splitters are available.

Beam combiners are used at an angle of 45° to add pilot beams to the beam path. They offer a maximum reflection for typical wavelengths in the visible range and simultaneously a maximum transmission at 10.6 µm.

• Angle of incidence: 45°