Beam combiner, in CO2 laser field, the beam combiner is to add the red indicator light into 10.6um laser path, making the focus position visible during process.
CO2 laser beam combiner is made of CVD Znse which owns a high transmittance but low absorption at 10.6um laser, it is coated with a special film, that allows 10.6μm laser pass through and reflect 632nm red light, the two beams combines into one, then it can indicate the laser path, to correct the marking position.