Surface erosion using lasers

Details Surface erosion using lasers Surface erosion using lasers

A - Human Necessities

61

F

327/1.2

A61F 9/00 (2006.01) A61F 9/01 (2006.01) B23K 26/06 (2006.01) G02B 5/00 (2006.01) A61B 17/00 (2006.01) A61B 17/30 (2006.01) A61F 9/008 (2006.01)

Patent

CA 1279103

ABSTRACT OF THE DISCLOSURE Laser apparatus for eroding a surface comprises means to select and control the shape and size of the area irradiated by each pulse of laser energy without varying the energy density of the beam. By varying the size of the irradiated area between pulses, some regions of the surface may be eroded more than others and so the surface may be reprofiled. The method and apparatus are suitable, inter alia, for removing corneal ulcers and reprofiling the cornea to remove refractive errors and also for reprofiling optical elements. In one embodiment the beam from the laser enters an optical system housed in an articulated arm and terminating in an eyepiece having a suction cup for attachment to an eye. The optical system comprises a beam forming arrangement to correct an asmymetric beam cross- section, a first relay telescope, a beam dimension control means and a second relay telescope. The beam dimension control means comprises a stop having a shaped window or a shaped stop portion and movable axially along a converging or diverging beam portion. An alternative beam dimension control means comprises a stop having a shaped window and positioned between coupled zoom systems. Mirrors adjustable slits and refractive systems may also be used. The laser is preferably an ArF excimer laser. The apparatus may comprise a measurement device to measure the surface profile, and a feedback control means to control the laser operation in accordance with the measured and desired profile.

517816

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