Patent ID: 6078420
Filing Date: 2000-06-20
Classification: B23K,G02B

Abstract:
An improved all-reflective high power laser beam scanning system with an adjustable focal length which includes at least one scanning mirror to angularly steer a predetermined portion of a laser beam along an optical path to a workpiece, comprising:a first mirror in the optical path of the laser beam and curved sufficiently to focus the laser beam at a first focal point;a second mirror in the optical path spaced from said first focal point and curved sufficiently to focus the laser beam at a second focal point and translatable sufficiently in a predetermined direction to adjust the focus of said laser beam at said second focal point; anda third mirror between said first and second mirrors and having a hole at said first focal point for passing said laser beam to said second mirror;said third mirror reflecting to said second focal point substantially all of said laser beam passed to said second mirror.