Patent ID: 7672343

Claim:
A high power laser processing system comprising a laser source for providing a high power laser illumination at a first wavelength, and at least one low absorption positionable mirror that is selectively angularly positionable to provide reflected high power laser illumination at a plurality of selectable angular positions along a linear range with respect to the high power laser illumination from the laser source, said low absorption positionable mirror including a substrate that is substantially transparent to and partially absorptive of illumination at said first wavelength, at least one highly reflective coating on a first side of said substrate, said highly reflective coating configured to reflect a first portion of the high power laser illumination incident thereon and to transmit a second portion of the high power laser illumination into said substrate, said first portion being substantially larger than the second portion, and a second side of said substrate on an opposite side of said substrate from said first side, said second side of said substrate for receiving the second portion of the high power laser illumination through the substrate and comprising a surface that is configured to reduce internally reflected or internally scattered illumination upon incidence of the second portion of the high power laser illumination at the second side of the substrate relative to an unpolished and uncoated substrate surface.