Wavelength:10.6um

Laser Type: CO2 Laser

Apply: CO2 Laser Marking Machine

Input Aperture:15mm

Output Aperture:40mm

This is not standard size of CO2 beam expander, this beam expander output aperature is much bigger than ordinary one,it is specially for fine marking, with bigger output beam, the focus spot is much smaller than normal size.

Compare with standard size CO2 beam expander 12mm aperture, , and galvo head, ftheta lens, if you need lager scan area, the focus spot is very big, so the marking line is rough.

if the scan area is 300*300, with 12mm laser beam, the focus spot is about 0.4mm.

with this bigger and adjust beam expander, the focus spot is about 0.2mm.

This zise f theta lens is specially good for DIY a marking laser machine or enhance your laser machine ability, if you buy from a manufacture with input beam 20mm lens, the laser machine price would be $10000 higher than the standerd size.

All the connection is the same with standard beam expander, you can fix it with thread or with screw, you can easily upgrade your machine.