Patent ID: 7830573

Claim:
A method for forming images on a photosensitive substrate, the method comprising: exposing, solely by a single laser beam wavefront lacking interference information, a rotating photosensitive substrate a first time to form a plurality of first diffractive elements, wherein the plurality of first diffractive elements are spaced at a first distance per revolution, wherein the exposing is accomplished without the use of a beamsplitter or a reference beam, and wherein the exposing is accomplished with one laser beam impact point; forming a first diffraction image comprising the plurality of first diffractive elements, wherein the first diffraction image can be viewed at a first angle; exposing, solely by the single laser beam wavefront lacking interference information, the rotating photosensitive substrate a second time to form a plurality of second diffractive elements, wherein the plurality of second diffractive elements are spaced at a second distance per revolution; and forming a second diffraction image comprising the plurality of second diffractive elements, wherein the second diffraction image can be viewed at a second angle different from the first angle.