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公开(公告)号：AU606315B2
公开(公告)日：1991-02-07
申请号：AU6241486
申请日：1986-09-05
Applicant: SUMMIT TECHNOLOGY INC
IPC: A61B18/20 , A61B17/00 , A61B17/30 , A61F9/00 , A61F9/007 , A61F9/008 , A61F9/01 , B23K26/00 , B23K26/06 , B23K26/073 , G02B5/00 , A61B17/36 , G02B26/08
Abstract: 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 (l48) enters an optical system housed in an articulated arm (l74, l78) and terminating in an eyepiece (l90) having a suction cup (206) for attachment to an eye. The optical system comprises a beam forming arrangement (l54, l32, l34, l36, l38, l40, l42) to correct an asmymetric beam crosssection, a first relay telescope (l56, l44, l46), a beam dimension control means (l58) and a second relay telescope (l60, l44, l46).The beam dimension control means (l58) comprises a stop (l26) having a shaped window or a shaped stop portion and movable axially along a converging or diverging beam portion (l24, l28, l30). An alternative beam dimension control means comprises a stop (92) having a shaped window and positioned between coupled zoom systems (90, 94). Mirrors (96), adjustable slits (52) and refractive systems (34, 36, 56, 62) 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.
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公开(公告)号：DE3679638D1
公开(公告)日：1991-07-11
申请号：DE3679638
申请日：1986-09-08
Applicant: SUMMIT TECHNOLOGY INC
IPC: A61B18/20 , A61B17/00 , A61B17/30 , A61F9/00 , A61F9/007 , A61F9/008 , A61F9/01 , B23K26/00 , B23K26/06 , B23K26/073 , G02B5/00 , A61B17/36
Abstract: 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 (l48) enters an optical system housed in an articulated arm (l74, l78) and terminating in an eyepiece (l90) having a suction cup (206) for attachment to an eye. The optical system comprises a beam forming arrangement (l54, l32, l34, l36, l38, l40, l42) to correct an asmymetric beam crosssection, a first relay telescope (l56, l44, l46), a beam dimension control means (l58) and a second relay telescope (l60, l44, l46).The beam dimension control means (l58) comprises a stop (l26) having a shaped window or a shaped stop portion and movable axially along a converging or diverging beam portion (l24, l28, l30). An alternative beam dimension control means comprises a stop (92) having a shaped window and positioned between coupled zoom systems (90, 94). Mirrors (96), adjustable slits (52) and refractive systems (34, 36, 56, 62) 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.
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