ZnSe Focus Lens 20mm for C02 laser 10.6um. Direct replacement for any 20mm lens

New improved 20mm diameter lens option.
Better thermal conductivity will remove the heat from the lens quicker.
The aluminum mount protects the lens and makes it easier to hold and clean.
The ZnSe used to make this product is 6000 watt rated. It is the best laser grade ZnSe manufactured by ll-Vl.
Each lens is engraved to show the beam direction and focal length.
Crystal stress causes beam distortion and lens overheating. 
This 12.7mm lens is suspended stress free with glue. Eliminating crystal stress and the need for an O-ring.

Important!!
If the diameter of your unfocused laser beam is 10mm or larger this lens option will not work.

I know this sounds crazy, but this less expensive lens option will work better than the the standard lens.
If you are not 100% satisfied return it an get a full credit towards a standard lens.

Please select Focal length

38.1mm(1.5")

50.8mm(2.0")

63.5mm(2.5")

101.6mm(4.0")

Diameter: 20mm (.768”)

 Product Specifications:

Anti-reflective coated lens for <200W.

Type: Meniscus Laser Focal Lens

Material: Znse Laser Grade(made in the USA)

Coating: 10.6um (AR Both Side)

Diameter Tolerance: +0/-0.13mm

Center Thickness Tolerance: ± 0.1mm

Focal Length Tolerance: < 1%

Clear Aperture: >= 90% Diameter

 Scratch/Dig: 40-20