| 摘要 |
PURPOSE:To enable abrasion with an even depth by correcting a solid difference or the like of an intensity distribution in a laser beam in an apparatus which perform an abrasion in a specified area of an object such as eyeball cornea by irradiation of the laser beam. CONSTITUTION:Laser beam from an excimer laser light beam 1 is deflected by 90 deg. each sequentially with a number of plane mirrors 2, 3 and 7. At this point, the plane mirror 3 moves parallel in the Z axis to make a translational scanning in the direction of an uneven intensity distribution. The laser beam is turned about an optical axis with an image rotator 4. Moreover, an abrasion area is limited with an aperture 5 allowing the altering of an opening diameter. Then, the aperture 5 is projected on an eyeball cornea 8 with a projection lens 6. In other words, the aperture 5 and the eyeball cornea 8 are set in a conjugate positional relationship for the projection lens 6. The area limited with the aperture 5 is made to form an image with the projection leans 6 on the eyeball cornea 8 to limit the abrasion area. |
