GaAs co2 laser cutter focus focusing lens, Applicable laser power: 80W-500W High Quality GaAs Material, Excellent optical properties, better quality for using, especially suitable for higher power laser cutter and engraver machine. High Transmittance: To obtain superior transmittance, GaAs crystals are grown by Vapor Deposition process. GaAs material is a chemically inert, non-hygroscopic and highly that has high resistance to thermal shock and stability in virtually all environments, can work under higher temperature and with work life. Double-sided Solid Coating, demonstrates superior CO2 laser transmittance and is employed as the transmission optical components used in CO2 laser processing. Type: 50.8 Durable knife moulder lens size: 20mm Material: Gallium arsenide colour: black Package Contents: 1 x GaAs Focus Lens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.