Appts. for forming laser beam for coaxial laser unit

摘要

Appts. for forming a laser beam (12) with cross section in the form of a ring sector includes a first mirror (20) with a surface shaped as a cone sector, and a second mirror (24) with a surface shaped as a parabolic cylinder. The line focus of this cylinder coincides at least approximately with the cone axis (30) of the first mirror (20). The appts. (20,24) is used with a coaxial laser unit, in particular, a coaxial waveguide laser unit with a resonator (6,8).