LASER-FOCUSING HEAD WITH ZnS LENSES HAVING PERIPHERAL THICKNESS OF AT LEAST 5 mm AND LASER CUTTING APPARATUS AND METHOD USING ONE SUCH FOCUSING HEAD

摘要

FIELD: physics, optics.;SUBSTANCE: invention relates to a laser beam focusing head for laser cutting, a method and an apparatus for laser cutting of a metal component. The focusing head comprises a collimating lens (13) and a focusing lens (14). The collimating lens (13) and the focusing lens (14) are made of ZnS and have peripheral thickness of at least 5 mm. A deflecting mirror (15) operating at an inclination angle (α) from 40° to 50° is placed between the collimating lens (13) and the focusing lens (14) on the path of the laser beam. The laser cutting apparatus comprises a solid-state laser device (SL) emitting a laser beam with wavelength of 1.06 mcm to 1.10 mcm and power of 0.1 kW to 25 kW, said focusing head and a conveying fibre (CF) connecting the solid-state laser device (SL) and the focusing head.;EFFECT: invention provides a stable focusing position of a laser beam during cutting.;13 cl, 5 dwg, 1 tbl