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    • 101. 发明授权
    • Surface erosion using lasers
    • 使用激光表面侵蚀
    • US4941093A
    • 1990-07-10
    • US905156
    • 1986-09-09
    • John MarshallAnthony L. RavenWalter T. WelfordKaren M. M. Ness
    • John MarshallAnthony L. RavenWalter T. WelfordKaren M. M. Ness
    • A61B18/20A61B17/00A61B17/30A61F9/00A61F9/007A61F9/008A61F9/01B23K26/00B23K26/06B23K26/073G02B5/00
    • B23K26/0652A61F9/00804A61F9/00817B23K26/0622B23K26/0648G02B5/001A61B2017/00119A61B2017/306A61F2009/00844A61F2009/00872A61F2009/00882
    • 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 includes a beam forming arrangement to correct an asymmetric beam cross-section, a first relay telescope, a beam dimensional control system and a second relay telescope. The beam dimension control system has a stop with a shaped window or a shaped stop portion and movable axially along a converging or diverging beam portion. An alternative beam dimension control system has a stop with 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 include a measurement device to measure the surface profile, and a feedback control system to control the laser operation in accordance with the measured and desired profiles.
    • 用于侵蚀表面的激光装置包括用于选择和控制由激光能量的每个脉冲照射的区域的形状和尺寸的装置,而不改变光束的能量密度。 通过改变脉冲之间的照射区域的尺寸,表面的某些区域可能比其他区域更多地腐蚀,因此表面可能被重新构造。 所述方法和装置特别适用于去除角膜溃疡并重新植入角膜以消除屈光不正以及重新生成光学元件。 在一个实施例中,来自激光器的光束进入容纳在铰接臂中的光学系统,并终止于具有用于附接到眼睛的吸盘的目镜中。 光学系统包括用于校正不对称光束横截面的光束形成装置,第一中继望远镜,光束尺寸控制系统和第二中继望远镜。 光束尺寸控制系统具有带有成形窗口或成形止挡部分的止动件,并且沿着会聚或发散的光束部分轴向移动。 一个替代的光束尺寸控制系统具有一个具有成形窗口并且位于耦合变焦系统之间的停止。 还可以使用镜子,可调缝和折射系统。 激光器优选为ArF准分子激光器。 该装置可以包括用于测量表面轮廓的测量装置,以及反馈控制系统,以根据所测量的和期望的轮廓来控制激光器的操作。