Specially designed for Relfar fiber laser welding and cleaning gun heads, available in D16, D20, D30 multiple sizes for flexible matching different equipment demands. Adopts 1064nm professional laser band planoconvex optical design, achieves excellent collimating and focusing effect with high laser beam gathering precision. Made of premium optical material with stable light transmittance, wear-resistant and high temperature resistant, ensures long-term stable operation in laser welding and cleaning work.