초록 ▼

Apparatus and methods to modify the intensity distribution of a beam of radiation, such as a laser, and for eroding surfaces with predetermined shapes. A rotatable mask is formed with one or more apertures that have a geometric spiral shape originating substantially the center of rotation on the mas

Apparatus and methods to modify the intensity distribution of a beam of radiation, such as a laser, and for eroding surfaces with predetermined shapes. A rotatable mask is formed with one or more apertures that have a geometric spiral shape originating substantially the center of rotation on the mask. The mask is insert to the beam for modification of the intensity of that beam, and additionally to form the desired etch pattern on a target surface. In a preferred embodiment, the invention is useful for performing kerotoplasty or keratomileusis.

대표청구항 ▼

Apparatus for modifying the spatial intensity distribution of a beam of radiation, comprising a mask for producing a predetermined transmitted spatial exposure distribution from an incident spatial intensity distribution, said mask being rotatable about a rotation point and having at least one trans

Apparatus for modifying the spatial intensity distribution of a beam of radiation, comprising a mask for producing a predetermined transmitted spatial exposure distribution from an incident spatial intensity distribution, said mask being rotatable about a rotation point and having at least one transmissive aperture oriented respective to said rotation point, said aperture having a geometric spiral shape that originates substantially from said rotation point and expands outwardly and further having a transmissive width that changes progressively along the length of said spiral shape, such that said transmitted spatial exposure varies as a function of radial position with respect to said rotation point; and an orientation device for tilting said mask relative to an optical axis to erode a surface astigmatically.