System for scanning a surgical laser beam

Details System for scanning a surgical laser beam System for scanning a surgical laser beam

B - Operations, Transporting

23

K

B23K 26/08 (2006.01) A61F 9/01 (2006.01) B23K 26/06 (2006.01) A61B 18/20 (2006.01) A61B 17/36 (1990.01)

Patent

CA 2069895

In a laser beam delivery system for a surgical laser beam, steering and scanning of the laser beam along the target (20) in transverse (X and Y) directions is accomplished in a mechanically simple and fast-responding manner. Closely adjacent to the objective lens assembly (24) of the delivery system is a pair of prisms (12, 14), i:e. Risley prism Ar Herschel prism; positioned on the axis (16) of the approaching laser beam (18). The two prisms are mounted on separate rotating stages whereby they may be individually rotated about the beam axis. Co-rotation of the prisms produces circular scans, in diameters depending on the angle between the prisms. Counter rotation of the prisms at equal speeds will produce a diametric line scan. Any desired complex scan pattern can be achieved using combinations of rotations of the prisms. Axial compactness and proximity to the objective lens as- sembly assure that virtually all of the angularly emerging beam from the prism pair passes through the objective lens assembly.

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